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The first of the title compounds, [Fe(C9H10N4O)3]Cl2·5.5H2O, is the first structurally characterized homoleptic tris[bis(imidazol-2-yl) ketone]-metal complex to be structurally defined. In the second of the title compounds, [FeCl2(C9H10N4O)2], a pair of monodentate donors supplants one of the bidentate ligands. In the third complex, [Fe2Cl4(C9H10N4O)2]·2CH3OH, a centrosymmetric binuclear compound with a pair of bridging chloride ligands, the introduction of a third chloro ligand results in five-coordination about each of the metal atoms; the environments of the latter are square pyramidal, with a chloro ligand at the apex and the two bidentate arrays about the base of the pyramid.
Supporting information
CCDC references: 245851; 245852; 245853
For the synthesis of (I), a solution of bis(l-methylimidazol-2-yl)methanone (0.233 g, 1.23 mmol) in methanol (40 ml) was added to a stirred solution of iron(II) chloride (0.052 g, 0.410 mmol) in methanol (20 ml). The rose colored solution that formed initially became purple as the amount of ligand added exceeded ca 0.25 equivalents. The solvent was removed under reduced pressure to give a dark-blue solid. This was recrystallized from methanol/dichloromethane, then from methanol/ether, and washed with light petroleum (3 × 7 ml) to give a blue microcrystalline solid, which was dried in a vacuum. The solid was dissolved in methanol (10 ml) and left to crystallize in a 50 ml Erlenmeyer flask capped with a small watch glass. A crop of dark-blue crystals suitable for X-ray analysis (0.06 g, 60%) was obtained. For the synthesis of (II), a solution of bis(l-methylimidazol-2-yl)methanone (0.7154 g, 3.761 mmol) in methanol (10 ml) was added dropwise to a stirred solution of iron(II) chloride (0.2383 g, 1.880 mmol) in methanol (16.5 ml). The rose colored solution that formed initially became purple as the amount of ligand added exceeded 1 equivalent. Diethylether (60 ml) was added to the dark-violet solution and the mixture was left to crystallize. Dark-blue crystals formed and were collected by cannula filtration, washed with diethyl ether (4 × 5 ml) and light petroleum (2 × 5 ml), and dried in a vacuum. Yield 0.8214 g, 1.620 mmol, 86%. Analysis found: C 42.82, H 3.68, N 21.82%; C18H20N8O2FeCl2 requires: C 42.63, H 3.97, N 22.09%. For the synthesis of (III), a solution of bis(l-methylimidazol-2-yl)methanone (0.1069 g, 0.562 mmol) in methanol (5.0 ml) was added dropwise to a stirred solution of iron(II) chloride (0.1867 g, 1.473 mmol) in methanol (20 ml). The blood-red solution that formed initially became purple at completion of ligand addition, whereupon methanol (10 ml) was added to return some of the red color to the solution. A layer of diethyl ether (60 ml) and a layer of light petroleum (17 ml) were added, and the reaction was allowed to stand for 3 d. The resulting mixture was filtered and the solvent was removed under reduced pressure to give a purple solid that was recrystallized from dichloromethane (30 ml) and light petroleum (50 ml). A mixture of blue and red crystals formed and were collected by cannula filtration; the red crystals were washed carefully with small portions of dichloromethane (40 ml) to remove the blue material and then dried in a vacuum. Yield 0.0926 g, 0.133 mmol, 24%.
H atoms were located from difference Fourier maps, and placed at idealized positions [C—H = 0.95 Å, and UisoH = 1.25Ueq(CCH) and 1.5Ueq(CCH3)] and not refined. For (I) and (III), the Hn atoms of the solvent molecules were not located. For (I), the site occupancy factor of atom O6 was assigned a value of 0.5 after trial refinement. For (III), the largest peak in the final difference map was located close to the atoms of the disordered methanol molecule (0.60 Å from C1 and 0.48 Å from O1').
For all compounds, data collection: SMART (Siemens, 1995); cell refinement: SAINT (Siemens, 1995); data reduction: SAINT; program(s) used to solve structure: Xtal3.5 (Hall et al., 1995); program(s) used to refine structure: CRYLSQ in Xtal3.5; molecular graphics: Xtal3.5; software used to prepare material for publication: BONDLA and CIFIO in Xtal3.5.
Crystal data top
[Fe(C9H10N4O)3]Cl2·5.5H2O | F(000) = 3320 |
Mr = 796.54 | Dx = 1.497 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -c 2yc | Cell parameters from 6946 reflections |
a = 21.3036 (10) Å | θ = 2.5–28.5° |
b = 13.9936 (7) Å | µ = 0.64 mm−1 |
c = 24.4634 (10) Å | T = 153 K |
β = 104.230 (1)° | Bar, dark blue |
V = 7069.1 (6) Å3 | 0.24 × 0.14 × 0.13 mm |
Z = 8 | |
Data collection top
Bruker SMART CCD diffractometer | 9402 independent reflections |
Radiation source: sealed tube | 6365 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.083 |
ω scans | θmax = 29.0°, θmin = 1.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −29→28 |
Tmin = 0.69, Tmax = 0.86 | k = −19→19 |
73261 measured reflections | l = −33→33 |
Refinement top
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.062 | Hydrogen site location: difference Fourier map |
wR(F2) = 0.13 | H-atom parameters not refined |
S = 1.38 | w = 1/(σ2(F2) + .60F2) |
6365 reflections | (Δ/σ)max = 0.001 |
460 parameters | Δρmax = 1.16 e Å−3 |
0 restraints | Δρmin = −1.06 e Å−3 |
0 constraints | |
Crystal data top
[Fe(C9H10N4O)3]Cl2·5.5H2O | V = 7069.1 (6) Å3 |
Mr = 796.54 | Z = 8 |
Monoclinic, C2/c | Mo Kα radiation |
a = 21.3036 (10) Å | µ = 0.64 mm−1 |
b = 13.9936 (7) Å | T = 153 K |
c = 24.4634 (10) Å | 0.24 × 0.14 × 0.13 mm |
β = 104.230 (1)° | |
Data collection top
Bruker SMART CCD diffractometer | 9402 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 6365 reflections with I > 2σ(I) |
Tmin = 0.69, Tmax = 0.86 | Rint = 0.083 |
73261 measured reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.062 | 0 restraints |
wR(F2) = 0.13 | H-atom parameters not refined |
S = 1.38 | Δρmax = 1.16 e Å−3 |
6365 reflections | Δρmin = −1.06 e Å−3 |
460 parameters | |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | Occ. (<1) |
Fe | 0.31160 (3) | 0.35463 (4) | 0.19031 (2) | 0.0234 (2) | |
N111 | 0.37546 (15) | 0.3402 (2) | 0.14385 (13) | 0.0249 (15) | |
C112 | 0.36879 (18) | 0.2903 (3) | 0.09635 (16) | 0.0250 (17) | |
N113 | 0.42219 (16) | 0.3004 (3) | 0.07517 (14) | 0.0281 (16) | |
C1131 | 0.4364 (2) | 0.2534 (4) | 0.0260 (2) | 0.041 (2) | |
C114 | 0.4641 (2) | 0.3580 (3) | 0.11116 (18) | 0.032 (2) | |
C115 | 0.4352 (2) | 0.3831 (3) | 0.15315 (18) | 0.032 (2) | |
C10 | 0.3146 (2) | 0.2282 (3) | 0.07008 (17) | 0.0263 (17) | |
O10 | 0.30836 (15) | 0.1985 (2) | 0.02233 (13) | 0.0368 (16) | |
N121 | 0.26417 (16) | 0.2417 (2) | 0.15250 (14) | 0.0252 (15) | |
C122 | 0.26888 (18) | 0.2021 (3) | 0.10410 (16) | 0.0237 (17) | |
N123 | 0.22502 (16) | 0.1297 (2) | 0.08905 (14) | 0.0274 (16) | |
C1231 | 0.2158 (2) | 0.0665 (3) | 0.0403 (2) | 0.037 (2) | |
C124 | 0.1922 (2) | 0.1233 (3) | 0.1297 (2) | 0.035 (2) | |
C125 | 0.2158 (2) | 0.1922 (3) | 0.16829 (19) | 0.034 (2) | |
N211 | 0.35843 (16) | 0.4681 (2) | 0.22579 (14) | 0.0285 (16) | |
C212 | 0.3643 (2) | 0.5516 (3) | 0.20061 (18) | 0.031 (2) | |
N213 | 0.40219 (18) | 0.6123 (3) | 0.23803 (16) | 0.0350 (18) | |
C2131 | 0.4156 (3) | 0.7136 (4) | 0.2292 (2) | 0.049 (3) | |
C214 | 0.4202 (2) | 0.5661 (4) | 0.2882 (2) | 0.037 (2) | |
C215 | 0.3935 (2) | 0.4774 (3) | 0.28042 (18) | 0.033 (2) | |
C20 | 0.3365 (2) | 0.5758 (3) | 0.14120 (18) | 0.031 (2) | |
O20 | 0.35669 (17) | 0.6431 (2) | 0.11865 (14) | 0.0439 (17) | |
N221 | 0.26052 (16) | 0.4376 (2) | 0.13005 (14) | 0.0255 (15) | |
C222 | 0.2806 (2) | 0.5190 (3) | 0.11170 (17) | 0.0285 (19) | |
N223 | 0.23831 (19) | 0.5485 (3) | 0.06358 (14) | 0.0334 (18) | |
C2231 | 0.2405 (3) | 0.6359 (3) | 0.0305 (2) | 0.045 (2) | |
C224 | 0.1892 (2) | 0.4838 (3) | 0.05168 (18) | 0.034 (2) | |
C225 | 0.2030 (2) | 0.4158 (3) | 0.09263 (17) | 0.0289 (19) | |
N311 | 0.36250 (16) | 0.2655 (2) | 0.24806 (14) | 0.0258 (15) | |
C312 | 0.3482 (2) | 0.2321 (3) | 0.29481 (17) | 0.0275 (18) | |
N313 | 0.39352 (16) | 0.1680 (2) | 0.32155 (15) | 0.0297 (16) | |
C3131 | 0.4008 (2) | 0.1226 (3) | 0.3769 (2) | 0.038 (2) | |
C314 | 0.4376 (2) | 0.1607 (3) | 0.29024 (19) | 0.033 (2) | |
C315 | 0.4182 (2) | 0.2200 (3) | 0.24524 (19) | 0.034 (2) | |
C30 | 0.2896 (2) | 0.2538 (3) | 0.31387 (18) | 0.032 (2) | |
O30 | 0.27204 (18) | 0.2030 (3) | 0.34772 (16) | 0.050 (2) | |
N321 | 0.25174 (16) | 0.3786 (2) | 0.24002 (14) | 0.0262 (15) | |
C322 | 0.25281 (19) | 0.3390 (3) | 0.28974 (17) | 0.0268 (18) | |
N323 | 0.21170 (16) | 0.3855 (3) | 0.31566 (14) | 0.0286 (16) | |
C3231 | 0.2024 (2) | 0.3687 (3) | 0.37237 (19) | 0.037 (2) | |
C324 | 0.1842 (2) | 0.4579 (3) | 0.28102 (18) | 0.031 (2) | |
C325 | 0.2089 (2) | 0.4535 (3) | 0.23435 (18) | 0.034 (2) | |
Cl1 | 0.41362 (6) | 0.05731 (9) | 0.11969 (6) | 0.0454 (6) | |
Cl2 | 0.38067 (8) | 0.37575 (13) | 0.41694 (7) | 0.0696 (9) | |
O1 | −0.0298 (2) | 0.4443 (3) | 0.03347 (18) | 0.069 (3) | |
O2 | −0.0001 (3) | 0.4042 (4) | 0.1945 (2) | 0.089 (3) | |
O3 | 0.4051 (3) | 0.7624 (4) | 0.0239 (2) | 0.098 (4) | |
O4 | 0.0002 (3) | 0.1750 (6) | 0.1010 (3) | 0.152 (6) | |
O5 | 0.0636 (3) | 0.3391 (6) | 0.1180 (3) | 0.129 (5) | |
O6 | 0.4568 (5) | 0.4537 (6) | −0.0328 (4) | 0.076 (6) | .50000 |
H1131a | 0.47993 | 0.26577 | 0.02524 | 0.05800* | |
H1131b | 0.42952 | 0.18674 | 0.02788 | 0.05800* | |
H1131c | 0.40822 | 0.27834 | −0.00758 | 0.05800* | |
H114 | 0.50596 | 0.37697 | 0.10782 | 0.03900* | |
H115 | 0.45371 | 0.42422 | 0.18404 | 0.03800* | |
H1231a | 0.25601 | 0.03778 | 0.03938 | 0.05700* | |
H1231b | 0.20040 | 0.10278 | 0.00661 | 0.05700* | |
H1231c | 0.18516 | 0.01831 | 0.04237 | 0.05700* | |
H124 | 0.15902 | 0.07895 | 0.13125 | 0.04300* | |
H125 | 0.20137 | 0.20416 | 0.20152 | 0.04000* | |
H2131a | 0.37670 | 0.74582 | 0.21331 | 0.07100* | |
H2131b | 0.44352 | 0.71735 | 0.20364 | 0.07100* | |
H2131c | 0.43725 | 0.74189 | 0.26393 | 0.07100* | |
H214 | 0.44649 | 0.59120 | 0.32218 | 0.04500* | |
H215 | 0.39854 | 0.42938 | 0.30865 | 0.04000* | |
H2231a | 0.20697 | 0.63422 | −0.00304 | 0.06700* | |
H2231b | 0.23560 | 0.69013 | 0.05224 | 0.06700* | |
H2231c | 0.28147 | 0.63906 | 0.02121 | 0.06700* | |
H224 | 0.15163 | 0.48604 | 0.02117 | 0.04000* | |
H225 | 0.17691 | 0.36127 | 0.09476 | 0.03400* | |
H3131a | 0.44460 | 0.10217 | 0.39057 | 0.05700* | |
H3131b | 0.39085 | 0.16789 | 0.40258 | 0.05700* | |
H3131c | 0.37285 | 0.06948 | 0.37330 | 0.05700* | |
H314 | 0.47535 | 0.12120 | 0.29856 | 0.04000* | |
H315 | 0.44010 | 0.22850 | 0.21591 | 0.04000* | |
H3231a | 0.24368 | 0.36517 | 0.39868 | 0.05400* | |
H3231b | 0.17817 | 0.42001 | 0.38251 | 0.05400* | |
H3231c | 0.18006 | 0.31026 | 0.37279 | 0.05400* | |
H324 | 0.15363 | 0.50328 | 0.28773 | 0.03700* | |
H325 | 0.19756 | 0.49433 | 0.20274 | 0.04100* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Fe | 0.0224 (3) | 0.0250 (3) | 0.0240 (3) | −0.0003 (2) | 0.0080 (2) | −0.0015 (2) |
N111 | 0.0224 (16) | 0.0272 (17) | 0.0263 (16) | −0.0005 (13) | 0.0080 (13) | 0.0020 (13) |
C112 | 0.0229 (18) | 0.028 (2) | 0.026 (2) | 0.0027 (15) | 0.0090 (15) | 0.0037 (16) |
N113 | 0.0240 (16) | 0.0335 (19) | 0.0291 (17) | 0.0008 (14) | 0.0111 (14) | 0.0013 (15) |
C1131 | 0.035 (2) | 0.054 (3) | 0.042 (3) | −0.003 (2) | 0.025 (2) | −0.004 (2) |
C114 | 0.0238 (19) | 0.039 (2) | 0.036 (2) | −0.0003 (18) | 0.0102 (16) | 0.004 (2) |
C115 | 0.025 (2) | 0.038 (2) | 0.034 (2) | −0.0065 (17) | 0.0077 (17) | −0.0030 (18) |
C10 | 0.0252 (19) | 0.028 (2) | 0.027 (2) | 0.0035 (16) | 0.0079 (15) | −0.0001 (16) |
O10 | 0.0373 (17) | 0.0449 (19) | 0.0306 (16) | −0.0067 (14) | 0.0130 (13) | −0.0056 (14) |
N121 | 0.0240 (16) | 0.0256 (17) | 0.0274 (17) | 0.0006 (13) | 0.0089 (13) | 0.0008 (14) |
C122 | 0.0213 (18) | 0.0228 (19) | 0.027 (2) | 0.0019 (14) | 0.0063 (15) | 0.0012 (15) |
N123 | 0.0297 (17) | 0.0232 (17) | 0.0306 (17) | −0.0038 (14) | 0.0098 (14) | −0.0021 (14) |
C1231 | 0.045 (3) | 0.031 (2) | 0.039 (2) | −0.011 (2) | 0.017 (2) | −0.010 (2) |
C124 | 0.035 (2) | 0.036 (2) | 0.040 (2) | −0.0096 (18) | 0.019 (2) | −0.003 (2) |
C125 | 0.035 (2) | 0.035 (2) | 0.038 (2) | −0.0068 (18) | 0.020 (2) | −0.002 (2) |
N211 | 0.0283 (17) | 0.0292 (18) | 0.0302 (18) | −0.0016 (14) | 0.0113 (14) | −0.0047 (14) |
C212 | 0.029 (2) | 0.030 (2) | 0.036 (2) | −0.0046 (17) | 0.0116 (17) | −0.0086 (18) |
N213 | 0.0299 (19) | 0.033 (2) | 0.043 (2) | −0.0038 (15) | 0.0097 (16) | −0.0092 (17) |
C2131 | 0.042 (3) | 0.033 (3) | 0.065 (4) | −0.010 (2) | 0.002 (2) | −0.010 (2) |
C214 | 0.030 (2) | 0.045 (3) | 0.036 (2) | −0.000 (2) | 0.0053 (18) | −0.010 (2) |
C215 | 0.029 (2) | 0.039 (2) | 0.032 (2) | −0.0011 (18) | 0.0073 (17) | −0.0048 (19) |
C20 | 0.034 (2) | 0.027 (2) | 0.035 (2) | −0.0027 (17) | 0.0136 (18) | −0.0042 (18) |
O20 | 0.053 (2) | 0.0368 (18) | 0.0467 (19) | −0.0118 (16) | 0.0216 (16) | 0.0023 (16) |
N221 | 0.0265 (17) | 0.0253 (17) | 0.0263 (16) | 0.0001 (14) | 0.0096 (13) | −0.0027 (14) |
C222 | 0.035 (2) | 0.027 (2) | 0.025 (2) | 0.0009 (17) | 0.0118 (17) | −0.0022 (16) |
N223 | 0.047 (2) | 0.0304 (19) | 0.0248 (17) | 0.0050 (17) | 0.0120 (16) | −0.0008 (15) |
C2231 | 0.075 (4) | 0.029 (2) | 0.031 (2) | 0.005 (2) | 0.013 (2) | 0.004 (2) |
C224 | 0.037 (2) | 0.037 (2) | 0.028 (2) | 0.006 (2) | 0.0083 (18) | −0.0051 (18) |
C225 | 0.027 (2) | 0.031 (2) | 0.028 (2) | 0.0018 (16) | 0.0059 (16) | −0.0063 (17) |
N311 | 0.0235 (16) | 0.0272 (17) | 0.0284 (17) | 0.0007 (13) | 0.0094 (13) | −0.0002 (14) |
C312 | 0.031 (2) | 0.023 (2) | 0.030 (2) | 0.0029 (16) | 0.0121 (17) | 0.0005 (16) |
N313 | 0.0274 (17) | 0.0299 (19) | 0.0339 (19) | 0.0043 (14) | 0.0115 (15) | 0.0051 (14) |
C3131 | 0.043 (3) | 0.037 (2) | 0.038 (2) | 0.011 (2) | 0.016 (2) | 0.011 (2) |
C314 | 0.024 (2) | 0.039 (2) | 0.038 (2) | 0.0043 (17) | 0.0112 (17) | 0.004 (2) |
C315 | 0.024 (2) | 0.045 (3) | 0.037 (2) | 0.0064 (18) | 0.0141 (18) | 0.006 (2) |
C30 | 0.034 (2) | 0.032 (2) | 0.035 (2) | 0.0086 (18) | 0.0172 (18) | 0.0047 (18) |
O30 | 0.057 (2) | 0.045 (2) | 0.062 (2) | 0.0197 (17) | 0.0416 (19) | 0.0228 (18) |
N321 | 0.0257 (16) | 0.0258 (17) | 0.0276 (17) | 0.0021 (13) | 0.0074 (13) | −0.0018 (13) |
C322 | 0.0249 (19) | 0.028 (2) | 0.030 (2) | 0.0024 (16) | 0.0117 (16) | −0.0015 (16) |
N323 | 0.0278 (17) | 0.0314 (18) | 0.0294 (17) | 0.0031 (14) | 0.0127 (14) | −0.0017 (14) |
C3231 | 0.044 (3) | 0.041 (3) | 0.034 (2) | 0.012 (2) | 0.021 (2) | 0.001 (2) |
C324 | 0.031 (2) | 0.031 (2) | 0.032 (2) | 0.0078 (17) | 0.0091 (17) | −0.0024 (17) |
C325 | 0.038 (2) | 0.035 (2) | 0.030 (2) | 0.0089 (19) | 0.0104 (18) | 0.0014 (18) |
Cl1 | 0.0343 (6) | 0.0382 (6) | 0.0650 (8) | −0.0002 (5) | 0.0149 (5) | 0.0062 (6) |
Cl2 | 0.0627 (9) | 0.0789 (11) | 0.0799 (11) | 0.0384 (8) | 0.0418 (8) | 0.0198 (9) |
O1 | 0.082 (3) | 0.066 (3) | 0.058 (3) | 0.005 (2) | 0.017 (2) | 0.000 (2) |
O2 | 0.110 (4) | 0.075 (3) | 0.078 (3) | 0.029 (3) | 0.017 (3) | 0.018 (3) |
O3 | 0.105 (4) | 0.102 (4) | 0.096 (4) | 0.001 (3) | 0.042 (3) | −0.012 (3) |
O4 | 0.117 (5) | 0.224 (9) | 0.130 (6) | 0.068 (6) | 0.058 (4) | 0.101 (6) |
O5 | 0.079 (4) | 0.178 (7) | 0.136 (5) | 0.050 (4) | 0.041 (4) | 0.039 (5) |
O6 | 0.115 (8) | 0.038 (4) | 0.081 (6) | −0.011 (5) | 0.036 (6) | 0.000 (4) |
Geometric parameters (Å, º) top
Fe—N111 | 1.986 (4) | C214—H214 | 0.949 |
Fe—N121 | 1.979 (3) | C215—H215 | 0.950 |
Fe—N211 | 1.961 (3) | C20—O20 | 1.222 (6) |
Fe—N221 | 1.979 (3) | C20—C222 | 1.465 (6) |
Fe—N311 | 1.993 (3) | N221—C222 | 1.333 (6) |
Fe—N321 | 1.995 (4) | N221—C225 | 1.371 (5) |
N111—C112 | 1.334 (5) | C222—N223 | 1.359 (5) |
N111—C115 | 1.375 (5) | N223—C2231 | 1.474 (6) |
C112—N113 | 1.368 (6) | N223—C224 | 1.361 (6) |
C112—C10 | 1.461 (5) | C2231—H2231a | 0.947 |
N113—C1131 | 1.467 (6) | C2231—H2231b | 0.946 |
N113—C114 | 1.355 (5) | C2231—H2231c | 0.956 |
C1131—H1131a | 0.948 | C224—C225 | 1.360 (6) |
C1131—H1131b | 0.948 | C224—H224 | 0.951 |
C1131—H1131c | 0.955 | C225—H225 | 0.953 |
C114—C115 | 1.367 (7) | N311—C312 | 1.338 (6) |
C114—H114 | 0.953 | N311—C315 | 1.363 (6) |
C115—H115 | 0.954 | C312—N313 | 1.363 (5) |
C10—O10 | 1.216 (5) | C312—C30 | 1.468 (7) |
C10—C122 | 1.474 (6) | N313—C3131 | 1.468 (6) |
N121—C122 | 1.333 (5) | N313—C314 | 1.354 (6) |
N121—C125 | 1.373 (6) | C3131—H3131a | 0.953 |
C122—N123 | 1.366 (5) | C3131—H3131b | 0.954 |
N123—C1231 | 1.459 (6) | C3131—H3131c | 0.943 |
N123—C124 | 1.352 (6) | C314—C315 | 1.359 (6) |
C1231—H1231a | 0.951 | C314—H314 | 0.955 |
C1231—H1231b | 0.954 | C315—H315 | 0.955 |
C1231—H1231c | 0.949 | C30—O30 | 1.217 (6) |
C124—C125 | 1.357 (6) | C30—C322 | 1.467 (6) |
C124—H124 | 0.948 | N321—C322 | 1.332 (5) |
C125—H125 | 0.952 | N321—C325 | 1.374 (6) |
N211—C212 | 1.341 (6) | C322—N323 | 1.366 (6) |
N211—C215 | 1.368 (5) | N323—C3231 | 1.468 (6) |
C212—N213 | 1.360 (5) | N323—C324 | 1.358 (5) |
C212—C20 | 1.468 (6) | C3231—H3231a | 0.954 |
N213—C2131 | 1.472 (6) | C3231—H3231b | 0.952 |
N213—C214 | 1.355 (6) | C3231—H3231c | 0.948 |
C2131—H2131a | 0.940 | C324—C325 | 1.371 (7) |
C2131—H2131b | 0.965 | C324—H324 | 0.953 |
C2131—H2131c | 0.947 | C325—H325 | 0.944 |
C214—C215 | 1.360 (7) | | |
| | | |
N111—Fe—N121 | 89.68 (14) | N213—C214—C215 | 107.1 (4) |
N111—Fe—N211 | 89.42 (15) | N213—C214—H214 | 126.3 |
N111—Fe—N221 | 87.81 (14) | C215—C214—H214 | 126.6 |
N111—Fe—N311 | 90.71 (14) | N211—C215—C214 | 109.4 (4) |
N111—Fe—N321 | 175.16 (13) | N211—C215—H215 | 125.5 |
N121—Fe—N211 | 178.46 (15) | C214—C215—H215 | 125.2 |
N121—Fe—N221 | 89.78 (13) | C212—C20—O20 | 121.6 (4) |
N121—Fe—N311 | 87.59 (13) | C212—C20—C222 | 116.3 (4) |
N121—Fe—N321 | 95.16 (14) | O20—C20—C222 | 122.0 (4) |
N211—Fe—N221 | 88.95 (13) | Fe—N221—C222 | 126.1 (3) |
N211—Fe—N311 | 93.66 (13) | Fe—N221—C225 | 127.2 (3) |
N211—Fe—N321 | 85.75 (15) | C222—N221—C225 | 105.8 (3) |
N221—Fe—N311 | 176.98 (14) | C20—C222—N221 | 125.9 (3) |
N221—Fe—N321 | 92.21 (14) | C20—C222—N223 | 123.1 (4) |
N311—Fe—N321 | 89.49 (14) | N221—C222—N223 | 110.6 (3) |
Fe—N111—C112 | 127.6 (3) | C222—N223—C2231 | 128.6 (4) |
Fe—N111—C115 | 126.7 (3) | C222—N223—C224 | 107.1 (4) |
C112—N111—C115 | 105.6 (4) | C2231—N223—C224 | 124.2 (4) |
N111—C112—N113 | 110.8 (3) | N223—C2231—H2231a | 109.6 |
N111—C112—C10 | 126.8 (4) | N223—C2231—H2231b | 109.6 |
N113—C112—C10 | 122.4 (4) | N223—C2231—H2231c | 108.8 |
C112—N113—C1131 | 128.5 (3) | H2231a—C2231—H2231b | 110.1 |
C112—N113—C114 | 107.0 (4) | H2231a—C2231—H2231c | 109.4 |
C1131—N113—C114 | 124.3 (4) | H2231b—C2231—H2231c | 109.3 |
N113—C1131—H1131a | 109.5 | N223—C224—C225 | 107.0 (3) |
N113—C1131—H1131b | 109.5 | N223—C224—H224 | 126.9 |
N113—C1131—H1131c | 109.2 | C225—C224—H224 | 126.1 |
H1131a—C1131—H1131b | 110.1 | N221—C225—C224 | 109.5 (4) |
H1131a—C1131—H1131c | 109.2 | N221—C225—H225 | 125.3 |
H1131b—C1131—H1131c | 109.3 | C224—C225—H225 | 125.2 |
N113—C114—C115 | 107.2 (4) | Fe—N311—C312 | 128.7 (3) |
N113—C114—H114 | 126.2 | Fe—N311—C315 | 125.8 (3) |
C115—C114—H114 | 126.6 | C312—N311—C315 | 105.3 (3) |
N111—C115—C114 | 109.5 (4) | N311—C312—N313 | 110.9 (4) |
N111—C115—H115 | 125.4 | N311—C312—C30 | 126.2 (4) |
C114—C115—H115 | 125.2 | N313—C312—C30 | 122.8 (4) |
C112—C10—O10 | 120.9 (4) | C312—N313—C3131 | 129.0 (4) |
C112—C10—C122 | 117.3 (4) | C312—N313—C314 | 106.7 (4) |
O10—C10—C122 | 121.7 (4) | C3131—N313—C314 | 123.9 (4) |
Fe—N121—C122 | 127.3 (3) | N313—C3131—H3131a | 109.1 |
Fe—N121—C125 | 127.1 (3) | N313—C3131—H3131b | 109.3 |
C122—N121—C125 | 105.4 (3) | N313—C3131—H3131c | 109.5 |
C10—C122—N121 | 127.1 (3) | H3131a—C3131—H3131b | 108.9 |
C10—C122—N123 | 122.3 (4) | H3131a—C3131—H3131c | 109.7 |
N121—C122—N123 | 110.6 (4) | H3131b—C3131—H3131c | 110.2 |
C122—N123—C1231 | 128.0 (4) | N313—C314—C315 | 107.2 (4) |
C122—N123—C124 | 107.1 (3) | N313—C314—H314 | 126.0 |
C1231—N123—C124 | 124.9 (4) | C315—C314—H314 | 126.8 |
N123—C1231—H1231a | 109.5 | N311—C315—C314 | 109.9 (4) |
N123—C1231—H1231b | 109.4 | N311—C315—H315 | 124.9 |
N123—C1231—H1231c | 110.0 | C314—C315—H315 | 125.2 |
H1231a—C1231—H1231b | 109.0 | C312—C30—O30 | 121.5 (4) |
H1231a—C1231—H1231c | 109.7 | C312—C30—C322 | 116.8 (4) |
H1231b—C1231—H1231c | 109.2 | O30—C30—C322 | 121.7 (4) |
N123—C124—C125 | 107.1 (4) | Fe—N321—C322 | 128.1 (3) |
N123—C124—H124 | 126.7 | Fe—N321—C325 | 125.1 (3) |
C125—C124—H124 | 126.2 | C322—N321—C325 | 105.8 (4) |
N121—C125—C124 | 109.8 (4) | C30—C322—N321 | 126.4 (4) |
N121—C125—H125 | 125.0 | C30—C322—N323 | 122.7 (4) |
C124—C125—H125 | 125.2 | N321—C322—N323 | 110.9 (3) |
Fe—N211—C212 | 126.7 (3) | C322—N323—C3231 | 127.8 (3) |
Fe—N211—C215 | 127.3 (3) | C322—N323—C324 | 107.0 (4) |
C212—N211—C215 | 106.0 (3) | C3231—N323—C324 | 124.9 (4) |
N211—C212—N213 | 110.0 (4) | N323—C3231—H3231a | 109.3 |
N211—C212—C20 | 126.5 (4) | N323—C3231—H3231b | 109.5 |
N213—C212—C20 | 123.4 (4) | N323—C3231—H3231c | 109.4 |
C212—N213—C2131 | 127.4 (4) | H3231a—C3231—H3231b | 109.4 |
C212—N213—C214 | 107.5 (4) | H3231a—C3231—H3231c | 109.3 |
C2131—N213—C214 | 124.7 (4) | H3231b—C3231—H3231c | 110.0 |
N213—C2131—H2131a | 109.8 | N323—C324—C325 | 106.9 (4) |
N213—C2131—H2131b | 108.7 | N323—C324—H324 | 126.7 |
N213—C2131—H2131c | 109.9 | C325—C324—H324 | 126.3 |
H2131a—C2131—H2131b | 109.1 | N321—C325—C324 | 109.4 (4) |
H2131a—C2131—H2131c | 110.9 | N321—C325—H325 | 125.1 |
H2131b—C2131—H2131c | 108.5 | C324—C325—H325 | 125.5 |
Crystal data top
[FeCl2(C9H10N4O)2] | F(000) = 1040 |
Mr = 507.17 | Dx = 1.591 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -p 2ybc | Cell parameters from 5040 reflections |
a = 14.650 (2) Å | θ = 2.4–34.5° |
b = 9.134 (1) Å | µ = 1.00 mm−1 |
c = 16.180 (2) Å | T = 153 K |
β = 102.078 (3)° | Hexagonal plate, dark blue |
V = 2117.2 (5) Å3 | 0.44 × 0.41 × 0.28 mm |
Z = 4 | |
Data collection top
Bruker SMART CCD diffractometer | 9074 independent reflections |
Radiation source: sealed tube | 6873 reflections with I > 2.00 σ(I) |
Graphite monochromator | Rint = 0.044 |
ω scans | θmax = 34.7°, θmin = 1.4° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −23→22 |
Tmin = 0.81, Tmax = 1 | k = −14→14 |
42826 measured reflections | l = −25→25 |
Refinement top
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.044 | Hydrogen site location: difference Fourier map |
wR(F2) = 0.082 | H-atom parameters not refined |
S = 1.05 | w = 1/(σ2(F2) + 2.3F2) |
6873 reflections | (Δ/σ)max = 0.045 |
280 parameters | Δρmax = 0.69 e Å−3 |
0 restraints | Δρmin = −0.54 e Å−3 |
0 constraints | |
Crystal data top
[FeCl2(C9H10N4O)2] | V = 2117.2 (5) Å3 |
Mr = 507.17 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 14.650 (2) Å | µ = 1.00 mm−1 |
b = 9.134 (1) Å | T = 153 K |
c = 16.180 (2) Å | 0.44 × 0.41 × 0.28 mm |
β = 102.078 (3)° | |
Data collection top
Bruker SMART CCD diffractometer | 9074 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 6873 reflections with I > 2.00 σ(I) |
Tmin = 0.81, Tmax = 1 | Rint = 0.044 |
42826 measured reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.082 | H-atom parameters not refined |
S = 1.05 | Δρmax = 0.69 e Å−3 |
6873 reflections | Δρmin = −0.54 e Å−3 |
280 parameters | |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
Fe | 0.248382 (18) | 0.45708 (3) | 0.315662 (18) | 0.01715 (10) | |
Cl1 | 0.22045 (4) | 0.57205 (6) | 0.17690 (3) | 0.0250 (2) | |
Cl2 | 0.27728 (3) | 0.20961 (5) | 0.26468 (3) | 0.02297 (19) | |
N111 | 0.21651 (11) | 0.6668 (2) | 0.36973 (11) | 0.0209 (7) | |
C112 | 0.13859 (13) | 0.7128 (2) | 0.39287 (12) | 0.0201 (7) | |
N113 | 0.14442 (13) | 0.8583 (2) | 0.41130 (13) | 0.0268 (8) | |
C1131 | 0.07587 (18) | 0.9525 (3) | 0.4393 (2) | 0.0395 (12) | |
C114 | 0.22836 (16) | 0.9058 (3) | 0.39852 (16) | 0.0307 (10) | |
C115 | 0.27199 (15) | 0.7868 (3) | 0.37403 (15) | 0.0282 (9) | |
C10 | 0.05498 (13) | 0.6262 (2) | 0.39544 (12) | 0.0207 (8) | |
O10 | −0.00361 (11) | 0.67229 (19) | 0.43352 (11) | 0.0309 (7) | |
N121 | 0.10194 (11) | 0.4162 (2) | 0.31374 (11) | 0.0204 (7) | |
C122 | 0.04096 (12) | 0.4861 (2) | 0.35054 (12) | 0.0190 (7) | |
N123 | −0.03869 (11) | 0.4054 (2) | 0.34350 (11) | 0.0205 (7) | |
C1231 | −0.12540 (14) | 0.4401 (3) | 0.37103 (14) | 0.0265 (9) | |
C124 | −0.02705 (14) | 0.2811 (2) | 0.30132 (14) | 0.0249 (9) | |
C125 | 0.06049 (14) | 0.2882 (3) | 0.28360 (14) | 0.0256 (9) | |
N211 | 0.39795 (11) | 0.4957 (2) | 0.34147 (11) | 0.0216 (7) | |
C212 | 0.46336 (13) | 0.4123 (2) | 0.38886 (13) | 0.0212 (8) | |
N213 | 0.54866 (11) | 0.4419 (2) | 0.37044 (12) | 0.0246 (7) | |
C2131 | 0.64000 (14) | 0.3778 (3) | 0.40725 (17) | 0.0349 (11) | |
C214 | 0.53570 (14) | 0.5466 (3) | 0.31032 (15) | 0.0288 (9) | |
C215 | 0.44251 (14) | 0.5794 (2) | 0.29268 (14) | 0.0261 (9) | |
C20 | 0.45110 (13) | 0.3017 (2) | 0.45101 (14) | 0.0235 (8) | |
O20 | 0.51602 (11) | 0.2222 (2) | 0.48319 (13) | 0.0385 (9) | |
N221 | 0.28207 (11) | 0.35938 (19) | 0.44317 (10) | 0.0187 (6) | |
C222 | 0.36094 (13) | 0.2903 (2) | 0.47713 (12) | 0.0195 (7) | |
N223 | 0.34865 (12) | 0.2038 (2) | 0.54265 (11) | 0.0229 (7) | |
C2231 | 0.41415 (17) | 0.1051 (3) | 0.59683 (16) | 0.0342 (11) | |
C224 | 0.25878 (15) | 0.2208 (2) | 0.55074 (13) | 0.0247 (9) | |
C225 | 0.21879 (14) | 0.3160 (2) | 0.48907 (13) | 0.0229 (8) | |
H1131a | 0.01508 | 0.93093 | 0.40750 | 0.05700* | |
H1131b | 0.09005 | 1.05227 | 0.43144 | 0.05700* | |
H1131c | 0.07734 | 0.93515 | 0.49751 | 0.05700* | |
H114 | 0.25212 | 1.00350 | 0.40531 | 0.03800* | |
H115 | 0.33313 | 0.78713 | 0.36180 | 0.03500* | |
H1231a | −0.11174 | 0.45983 | 0.43008 | 0.03100* | |
H1231b | −0.15351 | 0.52395 | 0.34146 | 0.03100* | |
H1231c | −0.16697 | 0.35956 | 0.35965 | 0.03100* | |
H124 | −0.07138 | 0.20322 | 0.28674 | 0.03100* | |
H125 | 0.08814 | 0.21442 | 0.25470 | 0.03200* | |
H2131a | 0.68689 | 0.42573 | 0.38484 | 0.04400* | |
H2131b | 0.63946 | 0.27636 | 0.39372 | 0.04400* | |
H2131c | 0.65264 | 0.38938 | 0.46698 | 0.04400* | |
H214 | 0.58267 | 0.58954 | 0.28479 | 0.03600* | |
H215 | 0.41294 | 0.65019 | 0.25193 | 0.03300* | |
H2231a | 0.43170 | 0.02856 | 0.56317 | 0.04000* | |
H2231b | 0.46869 | 0.15783 | 0.62271 | 0.04000* | |
H2231c | 0.38588 | 0.06418 | 0.63897 | 0.04000* | |
H224 | 0.22964 | 0.17490 | 0.59171 | 0.03000* | |
H225 | 0.15515 | 0.34783 | 0.47900 | 0.02800* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Fe | 0.01325 (10) | 0.02002 (12) | 0.01968 (12) | 0.00019 (9) | 0.00690 (8) | −0.00081 (10) |
Cl1 | 0.0270 (2) | 0.0256 (2) | 0.0240 (2) | 0.00678 (18) | 0.00947 (17) | 0.00268 (18) |
Cl2 | 0.0213 (2) | 0.0223 (2) | 0.0275 (2) | 0.00176 (16) | 0.01030 (17) | −0.00393 (18) |
N111 | 0.0175 (7) | 0.0222 (8) | 0.0243 (8) | −0.0011 (6) | 0.0071 (6) | −0.0027 (6) |
C112 | 0.0190 (8) | 0.0201 (8) | 0.0220 (8) | 0.0009 (6) | 0.0063 (6) | −0.0020 (7) |
N113 | 0.0241 (8) | 0.0218 (8) | 0.0358 (10) | 0.0010 (7) | 0.0093 (7) | −0.0067 (7) |
C1131 | 0.0336 (12) | 0.0256 (11) | 0.0623 (17) | 0.0048 (9) | 0.0168 (12) | −0.0127 (11) |
C114 | 0.0294 (10) | 0.0228 (10) | 0.0418 (13) | −0.0048 (8) | 0.0117 (9) | −0.0067 (9) |
C115 | 0.0230 (9) | 0.0254 (10) | 0.0391 (12) | −0.0050 (8) | 0.0131 (8) | −0.0063 (9) |
C10 | 0.0180 (8) | 0.0226 (9) | 0.0221 (8) | 0.0032 (7) | 0.0057 (6) | −0.0008 (7) |
O10 | 0.0246 (7) | 0.0316 (8) | 0.0411 (9) | 0.0008 (6) | 0.0174 (7) | −0.0082 (7) |
N121 | 0.0136 (6) | 0.0240 (8) | 0.0246 (8) | 0.0001 (6) | 0.0064 (6) | −0.0056 (6) |
C122 | 0.0134 (7) | 0.0220 (9) | 0.0220 (8) | 0.0004 (6) | 0.0048 (6) | −0.0009 (7) |
N123 | 0.0132 (6) | 0.0251 (8) | 0.0248 (8) | 0.0002 (6) | 0.0076 (6) | −0.0005 (6) |
C1231 | 0.0166 (8) | 0.0298 (11) | 0.0368 (11) | 0.0012 (7) | 0.0138 (8) | 0.0002 (9) |
C124 | 0.0171 (8) | 0.0283 (10) | 0.0305 (10) | −0.0037 (7) | 0.0077 (7) | −0.0064 (8) |
C125 | 0.0170 (8) | 0.0297 (10) | 0.0320 (10) | −0.0039 (7) | 0.0092 (7) | −0.0113 (8) |
N211 | 0.0158 (6) | 0.0237 (8) | 0.0269 (8) | −0.0024 (6) | 0.0083 (6) | 0.0004 (6) |
C212 | 0.0146 (7) | 0.0237 (9) | 0.0268 (9) | −0.0028 (6) | 0.0080 (7) | −0.0040 (7) |
N213 | 0.0135 (6) | 0.0308 (9) | 0.0314 (9) | −0.0039 (6) | 0.0087 (6) | −0.0076 (7) |
C2131 | 0.0135 (8) | 0.0457 (14) | 0.0469 (14) | −0.0010 (9) | 0.0091 (8) | −0.0089 (11) |
C214 | 0.0205 (8) | 0.0351 (11) | 0.0346 (11) | −0.0091 (8) | 0.0141 (8) | −0.0055 (9) |
C215 | 0.0221 (9) | 0.0289 (10) | 0.0297 (10) | −0.0063 (8) | 0.0111 (8) | 0.0019 (8) |
C20 | 0.0167 (8) | 0.0241 (9) | 0.0297 (10) | 0.0007 (7) | 0.0047 (7) | −0.0017 (8) |
O20 | 0.0211 (7) | 0.0408 (10) | 0.0543 (11) | 0.0090 (7) | 0.0092 (7) | 0.0126 (9) |
N221 | 0.0163 (6) | 0.0218 (7) | 0.0198 (7) | −0.0002 (6) | 0.0078 (5) | −0.0004 (6) |
C222 | 0.0182 (7) | 0.0194 (8) | 0.0213 (8) | −0.0007 (6) | 0.0054 (6) | −0.0010 (7) |
N223 | 0.0230 (7) | 0.0223 (8) | 0.0235 (8) | −0.0003 (6) | 0.0050 (6) | 0.0024 (6) |
C2231 | 0.0311 (11) | 0.0329 (12) | 0.0373 (12) | 0.0029 (9) | 0.0037 (9) | 0.0126 (10) |
C224 | 0.0264 (9) | 0.0264 (10) | 0.0239 (9) | −0.0028 (8) | 0.0113 (7) | 0.0008 (8) |
C225 | 0.0214 (8) | 0.0273 (10) | 0.0228 (9) | −0.0006 (7) | 0.0107 (7) | −0.0009 (7) |
Geometric parameters (Å, º) top
Fe—Cl1 | 2.4345 (6) | C124—C125 | 1.373 (3) |
Fe—Cl2 | 2.4729 (6) | C124—H124 | 0.959 |
Fe—N111 | 2.1961 (18) | C125—H125 | 0.957 |
Fe—N121 | 2.1713 (17) | N211—C212 | 1.334 (2) |
Fe—N211 | 2.1719 (16) | N211—C215 | 1.360 (3) |
Fe—N221 | 2.2069 (16) | C212—N213 | 1.371 (3) |
N111—C112 | 1.341 (3) | C212—C20 | 1.463 (3) |
N111—C115 | 1.358 (3) | N213—C2131 | 1.468 (3) |
C112—N113 | 1.361 (3) | N213—C214 | 1.349 (3) |
C112—C10 | 1.466 (3) | C2131—H2131a | 0.948 |
N113—C1131 | 1.464 (3) | C2131—H2131b | 0.952 |
N113—C114 | 1.360 (3) | C2131—H2131c | 0.951 |
C1131—H1131a | 0.951 | C214—C215 | 1.368 (3) |
C1131—H1131b | 0.949 | C214—H214 | 0.958 |
C1131—H1131c | 0.951 | C215—H215 | 0.959 |
C114—C115 | 1.361 (3) | C20—O20 | 1.223 (3) |
C114—H114 | 0.956 | C20—C222 | 1.472 (3) |
C115—H115 | 0.957 | N221—C222 | 1.330 (2) |
C10—O10 | 1.231 (3) | N221—C225 | 1.362 (3) |
C10—C122 | 1.464 (3) | C222—N223 | 1.364 (3) |
N121—C122 | 1.335 (3) | N223—C2231 | 1.466 (3) |
N121—C125 | 1.360 (3) | N223—C224 | 1.359 (3) |
C122—N123 | 1.365 (2) | C2231—H2231a | 0.954 |
N123—C1231 | 1.466 (3) | C2231—H2231b | 0.952 |
N123—C124 | 1.354 (3) | C2231—H2231c | 0.946 |
C1231—H1231a | 0.951 | C224—C225 | 1.360 (3) |
C1231—H1231b | 0.950 | C224—H224 | 0.957 |
C1231—H1231c | 0.948 | C225—H225 | 0.958 |
| | | |
Cl1—Fe—Cl2 | 95.40 (2) | H1231b—C1231—H1231c | 109.55 |
Cl1—Fe—N111 | 88.99 (5) | N123—C124—C125 | 106.70 (18) |
Cl1—Fe—N121 | 94.93 (5) | N123—C124—H124 | 126.6 |
Cl1—Fe—N211 | 94.33 (5) | C125—C124—H124 | 126.7 |
Cl1—Fe—N221 | 176.52 (5) | N121—C125—C124 | 109.4 (2) |
Cl2—Fe—N111 | 174.63 (5) | N121—C125—H125 | 125.3 |
Cl2—Fe—N121 | 94.34 (5) | C124—C125—H125 | 125.3 |
Cl2—Fe—N211 | 88.63 (5) | Fe—N211—C212 | 126.33 (14) |
Cl2—Fe—N221 | 85.51 (5) | Fe—N211—C215 | 124.54 (13) |
N111—Fe—N121 | 82.17 (6) | C212—N211—C215 | 106.30 (17) |
N111—Fe—N211 | 94.13 (6) | N211—C212—N213 | 109.89 (18) |
N111—Fe—N221 | 90.28 (6) | N211—C212—C20 | 127.80 (18) |
N121—Fe—N211 | 169.96 (7) | N213—C212—C20 | 122.30 (17) |
N121—Fe—N221 | 88.34 (6) | C212—N213—C2131 | 128.9 (2) |
N211—Fe—N221 | 82.33 (6) | C212—N213—C214 | 107.42 (16) |
Fe—N111—C112 | 130.44 (13) | C2131—N213—C214 | 123.6 (2) |
Fe—N111—C115 | 123.35 (15) | N213—C2131—H2131a | 109.5 |
C112—N111—C115 | 105.56 (18) | N213—C2131—H2131b | 109.4 |
N111—C112—N113 | 110.42 (18) | N213—C2131—H2131c | 109.6 |
N111—C112—C10 | 127.17 (18) | H2131a—C2131—H2131b | 109.5 |
N113—C112—C10 | 122.35 (19) | H2131a—C2131—H2131c | 109.6 |
C112—N113—C1131 | 128.7 (2) | H2131b—C2131—H2131c | 109.4 |
C112—N113—C114 | 107.2 (2) | N213—C214—C215 | 106.8 (2) |
C1131—N113—C114 | 124.1 (2) | N213—C214—H214 | 126.6 |
N113—C1131—H1131a | 109.7 | C215—C214—H214 | 126.6 |
N113—C1131—H1131b | 109.8 | N211—C215—C214 | 109.5 (2) |
N113—C1131—H1131c | 109.5 | N211—C215—H215 | 125.1 |
H1131a—C1131—H1131b | 109.4 | C214—C215—H215 | 125.3 |
H1131a—C1131—H1131c | 109.0 | C212—C20—O20 | 120.4 (2) |
H1131b—C1131—H1131c | 109.4 | C212—C20—C222 | 119.52 (17) |
N113—C114—C115 | 106.5 (2) | O20—C20—C222 | 120.0 (2) |
N113—C114—H114 | 126.8 | Fe—N221—C222 | 125.66 (14) |
C115—C114—H114 | 126.7 | Fe—N221—C225 | 125.63 (12) |
N111—C115—C114 | 110.3 (2) | C222—N221—C225 | 105.55 (17) |
N111—C115—H115 | 124.6 | C20—C222—N221 | 126.99 (18) |
C114—C115—H115 | 125.1 | C20—C222—N223 | 122.44 (17) |
C112—C10—O10 | 120.29 (19) | N221—C222—N223 | 110.56 (18) |
C112—C10—C122 | 119.23 (18) | C222—N223—C2231 | 130.1 (2) |
O10—C10—C122 | 120.46 (18) | C222—N223—C224 | 107.26 (16) |
Fe—N121—C122 | 131.50 (13) | C2231—N223—C224 | 122.6 (2) |
Fe—N121—C125 | 121.23 (14) | N223—C2231—H2231a | 109.3 |
C122—N121—C125 | 106.31 (17) | N223—C2231—H2231b | 109.6 |
C10—C122—N121 | 126.98 (17) | N223—C2231—H2231c | 110.1 |
C10—C122—N123 | 122.84 (18) | H2231a—C2231—H2231b | 108.7 |
N121—C122—N123 | 110.14 (17) | H2231a—C2231—H2231c | 109.5 |
C122—N123—C1231 | 129.61 (18) | H2231b—C2231—H2231c | 109.7 |
C122—N123—C124 | 107.44 (17) | N223—C224—C225 | 106.3 (2) |
C1231—N123—C124 | 122.90 (17) | N223—C224—H224 | 126.7 |
N123—C1231—H1231a | 109.42 | C225—C224—H224 | 127.0 |
N123—C1231—H1231b | 109.5 | N221—C225—C224 | 110.36 (18) |
N123—C1231—H1231c | 109.6 | N221—C225—H225 | 124.6 |
H1231a—C1231—H1231b | 109.3 | C224—C225—H225 | 125.0 |
H1231a—C1231—H1231c | 109.5 | | |
Crystal data top
[Fe2Cl4(C9H10N4O)2]·2CH4O | Z = 1 |
Mr = 693.97 | F(000) = 352 |
Triclinic, P1 | Dx = 1.663 Mg m−3 |
Hall symbol: -p 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.358 (3) Å | Cell parameters from 2043 reflections |
b = 9.215 (3) Å | θ = 2.5–27.4° |
c = 10.650 (4) Å | µ = 1.48 mm−1 |
α = 93.175 (5)° | T = 300 K |
β = 108.871 (4)° | Plate, red |
γ = 113.923 (4)° | 0.25 × 0.22 × 0.1 mm |
V = 692.8 (4) Å3 | |
Data collection top
Bruker SMART CCD diffractometer | 3012 independent reflections |
Radiation source: sealed tube | 2200 reflections with I > 2.00 σ(I) |
Graphite monochromator | Rint = 0.024 |
ω scans | θmax = 27.0°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −11→10 |
Tmin = 0.82, Tmax = 1 | k = −12→11 |
6649 measured reflections | l = −14→14 |
Refinement top
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.067 | Hydrogen site location: difference Fourier map |
wR(F2) = 0.146 | H-atom parameters not refined |
S = 0.96 | w = 1/(σ2(F2) + 0.58F2) |
2085 reflections | (Δ/σ)max = 0.018 |
170 parameters | Δρmax = 1.52 e Å−3 |
0 restraints | Δρmin = −0.40 e Å−3 |
0 constraints | |
Crystal data top
[Fe2Cl4(C9H10N4O)2]·2CH4O | γ = 113.923 (4)° |
Mr = 693.97 | V = 692.8 (4) Å3 |
Triclinic, P1 | Z = 1 |
a = 8.358 (3) Å | Mo Kα radiation |
b = 9.215 (3) Å | µ = 1.48 mm−1 |
c = 10.650 (4) Å | T = 300 K |
α = 93.175 (5)° | 0.25 × 0.22 × 0.1 mm |
β = 108.871 (4)° | |
Data collection top
Bruker SMART CCD diffractometer | 3012 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 2200 reflections with I > 2.00 σ(I) |
Tmin = 0.82, Tmax = 1 | Rint = 0.024 |
6649 measured reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.067 | 0 restraints |
wR(F2) = 0.146 | H-atom parameters not refined |
S = 0.96 | Δρmax = 1.52 e Å−3 |
2085 reflections | Δρmin = −0.40 e Å−3 |
170 parameters | |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | Occ. (<1) |
Fe | 0.52639 (18) | 0.63381 (14) | 0.37401 (12) | 0.0405 (5) | |
Cl1 | 0.5077 (4) | 0.6406 (3) | 0.5995 (3) | 0.0689 (12) | |
Cl2 | 0.2435 (3) | 0.6145 (3) | 0.2333 (2) | 0.0584 (11) | |
N11 | 0.7129 (9) | 0.8896 (8) | 0.4305 (7) | 0.043 (3) | |
C12 | 0.8073 (11) | 0.9828 (9) | 0.3613 (8) | 0.040 (3) | |
N13 | 0.8715 (10) | 1.1419 (8) | 0.4142 (7) | 0.044 (3) | |
C131 | 0.9800 (15) | 1.2867 (10) | 0.3711 (11) | 0.063 (5) | |
C14 | 0.8134 (13) | 1.1497 (10) | 0.5187 (9) | 0.050 (4) | |
C15 | 0.7174 (13) | 0.9954 (10) | 0.5285 (9) | 0.049 (4) | |
C10 | 0.8387 (12) | 0.9261 (10) | 0.2440 (9) | 0.044 (3) | |
O10 | 0.9179 (10) | 1.0235 (7) | 0.1847 (7) | 0.064 (3) | |
N21 | 0.6779 (10) | 0.6310 (8) | 0.2457 (7) | 0.046 (3) | |
C22 | 0.7774 (11) | 0.7526 (9) | 0.1985 (8) | 0.040 (3) | |
N23 | 0.8176 (10) | 0.6939 (8) | 0.0993 (7) | 0.046 (3) | |
C231 | 0.9235 (15) | 0.7813 (12) | 0.0180 (10) | 0.065 (5) | |
C24 | 0.7427 (15) | 0.5300 (12) | 0.0846 (10) | 0.058 (4) | |
C25 | 0.6561 (15) | 0.4921 (11) | 0.1741 (10) | 0.058 (4) | |
O1 | 0.4474 (10) | 0.0533 (8) | 0.1629 (8) | 0.0080 (16)* | .50000 |
C1 | 0.455 (2) | −0.013 (2) | 0.0634 (14) | 0.025 (3)* | .50000 |
O1' | 0.4692 (13) | 0.0480 (12) | 0.1112 (12) | 0.024 (2)* | .50000 |
C1' | 0.420 (2) | −0.092 (2) | 0.0331 (17) | 0.044 (4)* | .50000 |
H131a | 1.02863 | 1.38466 | 0.43644 | 0.09300* | |
H131b | 0.90677 | 1.29622 | 0.28556 | 0.09300* | |
H131c | 1.08898 | 1.28050 | 0.36278 | 0.09300* | |
H14 | 0.84069 | 1.24822 | 0.57651 | 0.05900* | |
H15 | 0.65962 | 0.96324 | 0.59471 | 0.06000* | |
H231a | 0.84394 | 0.80462 | −0.05571 | 0.09700* | |
H231b | 0.97004 | 0.71568 | −0.01825 | 0.09700* | |
H231c | 1.02933 | 0.88003 | 0.07354 | 0.09700* | |
H24 | 0.74984 | 0.45442 | 0.02253 | 0.06800* | |
H25 | 0.58783 | 0.38331 | 0.18410 | 0.07000* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Fe | 0.0437 (7) | 0.0394 (6) | 0.0437 (7) | 0.0160 (5) | 0.0254 (6) | 0.0158 (5) |
Cl1 | 0.128 (2) | 0.0467 (13) | 0.0596 (16) | 0.0418 (15) | 0.0631 (17) | 0.0263 (11) |
Cl2 | 0.0514 (14) | 0.0745 (16) | 0.0530 (14) | 0.0309 (13) | 0.0205 (11) | 0.0150 (12) |
N11 | 0.044 (4) | 0.042 (4) | 0.046 (4) | 0.018 (3) | 0.023 (3) | 0.013 (3) |
C12 | 0.039 (5) | 0.038 (4) | 0.043 (5) | 0.014 (4) | 0.018 (4) | 0.015 (4) |
N13 | 0.043 (4) | 0.037 (4) | 0.048 (4) | 0.014 (3) | 0.018 (3) | 0.014 (3) |
C131 | 0.075 (7) | 0.033 (5) | 0.074 (7) | 0.011 (5) | 0.035 (6) | 0.018 (5) |
C14 | 0.054 (6) | 0.045 (5) | 0.050 (6) | 0.019 (4) | 0.023 (4) | 0.004 (4) |
C15 | 0.052 (6) | 0.048 (5) | 0.049 (5) | 0.017 (4) | 0.029 (4) | 0.011 (4) |
C10 | 0.043 (5) | 0.040 (4) | 0.044 (5) | 0.013 (4) | 0.018 (4) | 0.016 (4) |
O10 | 0.085 (5) | 0.045 (4) | 0.062 (4) | 0.014 (3) | 0.048 (4) | 0.022 (3) |
N21 | 0.054 (4) | 0.041 (4) | 0.054 (5) | 0.020 (3) | 0.032 (4) | 0.018 (3) |
C22 | 0.037 (5) | 0.041 (4) | 0.046 (5) | 0.017 (4) | 0.023 (4) | 0.015 (4) |
N23 | 0.052 (5) | 0.043 (4) | 0.054 (5) | 0.021 (4) | 0.034 (4) | 0.020 (3) |
C231 | 0.087 (8) | 0.065 (6) | 0.065 (7) | 0.028 (6) | 0.060 (6) | 0.029 (5) |
C24 | 0.076 (7) | 0.055 (6) | 0.067 (7) | 0.034 (5) | 0.047 (6) | 0.020 (5) |
C25 | 0.080 (7) | 0.043 (5) | 0.074 (7) | 0.027 (5) | 0.054 (6) | 0.021 (5) |
Geometric parameters (Å, º) top
Fe—Cl1 | 2.455 (4) | C15—H15 | 0.972 |
Fe—Cl2 | 2.282 (3) | C10—O10 | 1.222 (12) |
Fe—N11 | 2.146 (6) | C10—C22 | 1.464 (12) |
Fe—N21 | 2.148 (10) | N21—C22 | 1.333 (11) |
Fe—Cl1 | 2.470 (3) | N21—C25 | 1.366 (14) |
N11—C12 | 1.342 (12) | C22—N23 | 1.355 (14) |
N11—C15 | 1.368 (13) | N23—C231 | 1.475 (15) |
C12—N13 | 1.353 (11) | N23—C24 | 1.357 (12) |
C12—C10 | 1.467 (15) | C231—H231a | 0.949 |
N13—C131 | 1.473 (12) | C231—H231b | 0.964 |
N13—C14 | 1.359 (14) | C231—H231c | 0.953 |
C131—H131a | 0.957 | C24—C25 | 1.354 (18) |
C131—H131b | 0.951 | C24—H24 | 0.966 |
C131—H131c | 0.967 | C25—H25 | 0.964 |
C14—C15 | 1.350 (12) | O1—C1 | 1.22 (2) |
C14—H14 | 0.967 | O1'—C1' | 1.33 (2) |
| | | |
Cl1—Fe—Cl2 | 104.48 (13) | C15—C14—H14 | 127.1 |
Cl1—Fe—N11 | 90.4 (2) | N11—C15—C14 | 109.7 (9) |
Cl1—Fe—N21 | 149.8 (2) | N11—C15—H15 | 124.7 |
Cl1—Fe—Cl1 | 80.68 (11) | C14—C15—H15 | 125.6 |
Cl2—Fe—N11 | 104.4 (2) | C12—C10—O10 | 120.2 (8) |
Cl2—Fe—N21 | 105.6 (2) | C12—C10—C22 | 120.1 (8) |
Cl2—Fe—Cl1 | 109.42 (10) | O10—C10—C22 | 119.7 (9) |
N11—Fe—N21 | 83.5 (3) | Fe—N21—C22 | 129.0 (7) |
N11—Fe—Cl1 | 146.2 (2) | Fe—N21—C25 | 123.8 (6) |
N21—Fe—Cl1 | 88.0 (2) | C22—N21—C25 | 106.0 (9) |
Fe—Cl1—Fe | 99.32 (12) | C10—C22—N21 | 126.8 (9) |
Fe—N11—C12 | 128.7 (6) | C10—C22—N23 | 123.0 (8) |
Fe—N11—C15 | 123.7 (6) | N21—C22—N23 | 110.2 (8) |
C12—N11—C15 | 105.6 (7) | C22—N23—C231 | 129.8 (8) |
N11—C12—N13 | 110.3 (9) | C22—N23—C24 | 107.4 (8) |
N11—C12—C10 | 126.6 (7) | C231—N23—C24 | 122.8 (10) |
N13—C12—C10 | 123.1 (8) | N23—C231—H231a | 110.4 |
C12—N13—C131 | 129.4 (9) | N23—C231—H231b | 110.1 |
C12—N13—C14 | 107.3 (7) | N23—C231—H231c | 110.1 |
C131—N13—C14 | 123.3 (8) | H231a—C231—H231b | 108.4 |
N13—C131—H131a | 112.1 | H231a—C231—H231c | 109.7 |
N13—C131—H131b | 112.0 | H231b—C231—H231c | 108.1 |
N13—C131—H131c | 109.9 | N23—C24—C25 | 106.9 (10) |
H131a—C131—H131b | 108.9 | N23—C24—H24 | 126.8 |
H131a—C131—H131c | 105.9 | C25—C24—H24 | 126.3 |
H131b—C131—H131c | 107.8 | N21—C25—C24 | 109.5 (8) |
N13—C14—C15 | 107.1 (9) | N21—C25—H25 | 125.6 |
N13—C14—H14 | 125.7 | C24—C25—H25 | 124.9 |
Experimental details
| (I) | (II) | (III) |
Crystal data |
Chemical formula | [Fe(C9H10N4O)3]Cl2·5.5H2O | [FeCl2(C9H10N4O)2] | [Fe2Cl4(C9H10N4O)2]·2CH4O |
Mr | 796.54 | 507.17 | 693.97 |
Crystal system, space group | Monoclinic, C2/c | Monoclinic, P21/c | Triclinic, P1 |
Temperature (K) | 153 | 153 | 300 |
a, b, c (Å) | 21.3036 (10), 13.9936 (7), 24.4634 (10) | 14.650 (2), 9.134 (1), 16.180 (2) | 8.358 (3), 9.215 (3), 10.650 (4) |
α, β, γ (°) | 90, 104.230 (1), 90 | 90, 102.078 (3), 90 | 93.175 (5), 108.871 (4), 113.923 (4) |
V (Å3) | 7069.1 (6) | 2117.2 (5) | 692.8 (4) |
Z | 8 | 4 | 1 |
Radiation type | Mo Kα | Mo Kα | Mo Kα |
µ (mm−1) | 0.64 | 1.00 | 1.48 |
Crystal size (mm) | 0.24 × 0.14 × 0.13 | 0.44 × 0.41 × 0.28 | 0.25 × 0.22 × 0.1 |
|
Data collection |
Diffractometer | Bruker SMART CCD diffractometer | Bruker SMART CCD diffractometer | Bruker SMART CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) | Multi-scan (SADABS; Sheldrick, 1996) | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.69, 0.86 | 0.81, 1 | 0.82, 1 |
No. of measured, independent and observed reflections | 73261, 9402, 6365 [I > 2σ(I)] | 42826, 9074, 6873 [I > 2.00 σ(I)] | 6649, 3012, 2200 [I > 2.00 σ(I)] |
Rint | 0.083 | 0.044 | 0.024 |
(sin θ/λ)max (Å−1) | 0.682 | 0.800 | 0.640 |
|
Refinement |
R[F2 > 2σ(F2)], wR(F2), S | 0.062, 0.13, 1.38 | 0.044, 0.082, 1.05 | 0.067, 0.146, 0.96 |
No. of reflections | 6365 | 6873 | 2085 |
No. of parameters | 460 | 280 | 170 |
H-atom treatment | H-atom parameters not refined | H-atom parameters not refined | H-atom parameters not refined |
Δρmax, Δρmin (e Å−3) | 1.16, −1.06 | 0.69, −0.54 | 1.52, −0.40 |
Selected geometric parameters (Å, º) for (I) topFe—N111 | 1.986 (4) | Fe—N221 | 1.979 (3) |
Fe—N121 | 1.979 (3) | Fe—N311 | 1.993 (3) |
Fe—N211 | 1.961 (3) | Fe—N321 | 1.995 (4) |
| | | |
N111—Fe—N121 | 89.68 (14) | N121—Fe—N321 | 95.16 (14) |
N111—Fe—N211 | 89.42 (15) | N211—Fe—N221 | 88.95 (13) |
N111—Fe—N221 | 87.81 (14) | N211—Fe—N311 | 93.66 (13) |
N111—Fe—N311 | 90.71 (14) | N211—Fe—N321 | 85.75 (15) |
N111—Fe—N321 | 175.16 (13) | N221—Fe—N311 | 176.98 (14) |
N121—Fe—N211 | 178.46 (15) | N221—Fe—N321 | 92.21 (14) |
N121—Fe—N221 | 89.78 (13) | N311—Fe—N321 | 89.49 (14) |
N121—Fe—N311 | 87.59 (13) | | |
Selected geometric parameters (Å, º) for (II) topFe—Cl1 | 2.4345 (6) | Fe—N121 | 2.1713 (17) |
Fe—Cl2 | 2.4729 (6) | Fe—N211 | 2.1719 (16) |
Fe—N111 | 2.1961 (18) | Fe—N221 | 2.2069 (16) |
| | | |
Cl1—Fe—Cl2 | 95.40 (2) | Cl2—Fe—N221 | 85.51 (5) |
Cl1—Fe—N111 | 88.99 (5) | N111—Fe—N121 | 82.17 (6) |
Cl1—Fe—N121 | 94.93 (5) | N111—Fe—N211 | 94.13 (6) |
Cl1—Fe—N211 | 94.33 (5) | N111—Fe—N221 | 90.28 (6) |
Cl1—Fe—N221 | 176.52 (5) | N121—Fe—N211 | 169.96 (7) |
Cl2—Fe—N111 | 174.63 (5) | N121—Fe—N221 | 88.34 (6) |
Cl2—Fe—N121 | 94.34 (5) | N211—Fe—N221 | 82.33 (6) |
Cl2—Fe—N211 | 88.63 (5) | | |
Selected geometric parameters (Å, º) for (III) topFe—Cl1 | 2.455 (4) | Fe—N21 | 2.148 (10) |
Fe—Cl2 | 2.282 (3) | Fe—Cl1 | 2.470 (3) |
Fe—N11 | 2.146 (6) | | |
| | | |
Cl1—Fe—Cl2 | 104.48 (13) | Cl2—Fe—Cl1 | 109.42 (10) |
Cl1—Fe—N11 | 90.4 (2) | N11—Fe—N21 | 83.5 (3) |
Cl1—Fe—Cl1 | 80.68 (11) | N11—Fe—Cl1 | 146.2 (2) |
Cl2—Fe—N11 | 104.4 (2) | N21—Fe—Cl1 | 88.0 (2) |
Cl2—Fe—N21 | 105.6 (2) | Fe—Cl1—Fe | 99.32 (12) |
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Metal chelate complexes of N,N'-bidentate ligands with aromatic heterocyclic donors have long been prominent features in coordination chemistry. Many of these are derivative of 2,2'-bipyridyl, but more recently, the chelate ring size and flexibility have been increased by the introduction of diverse linking groups between the two rings. Thus bis(2-pyridyl)ketone complexes have been widely explored, with, in turn, further modifications by the incorporation of other heterocycles, some of different ring size, bis(imidazol-2-yl)ketone being of particular relevance here. Structurally characterized chelate complexes of ligands of the latter type have been restricted to arrays of metals with coordination number four, with the exception of chromium(III) (Rüther et al., 2002), ruthenium (Elgafi et al., 1997), copper(I) (Gorun et al., 1996) and copper(II) complexes (Byers et al., 1985). Some of these are homoleptic bis(ligand) metal ion complexes for diversely substituted ligands, those of particular interest in the context of the present ligands being for M = Zn(II) (Chen et al., 1995), Cu(II) (Stange & Kaim, 1996; McMaster et al., 1996) and Cu(I) (McMaster et al., 1996), homoleptic arrays of the unsubstituted ligand being recorded for these metals also (Long et al., 2001; Place et al., 1998).
The intention of the present work was to explore the nature of complexes formed with a metal ion system inherently capable of yielding complexes in which the coordination number about the metal is intrinsically higher. Iron(II) is such a system; other studies recorded in an accompanying paper (Batten et al., 2004a; see also references therein) have shown the possibility of forming homoleptic bis(ligand) metal arrays with tris-imidazolyl donors by the reaction of the ligand with the metal chloride. We turned our attention to such a possibility here with the parallel ligand bis(1-methyl-1H-imidazolyl) ketone, obtaining the three title complexes, which have been characterized by diffraction studies.
The results of the single-crystal X-ray studies are consistent in stoichiometry and connectivity with the formulation of the three title complexes, (I), (III) and (III), respectively. In (I) and (II), one mononuclear formula unit, devoid of crystallographic symmetry, composes the asymmetric unit of each structure; in (III), the asymmetric unit comprises one-half of the centrosymmetric binuclear unit. In (I), layers of cations, normal to a*, are interleaved by layers of anions and solvent moieties; although not modelled as disordered or with diminished site occupancies, displacement parameters of the latter are high, diminishing the precision of the determination. A similar comment applies to (III), where, despite good quality data, solvent disorder again militates against optimal precision in the determination.
Compound (I) is the first structurally characterized tris[bis(imidazolyl)ketone]metal ion system; like all such systems, the complex is inherently chiral (Fig. 1), although the crystal overall is racemic. The environment about the metal atom is remarkably close to octahedral; the mean Fe—N distance is 1.983 (12) Å, consistent with low-spin iron(II) with the maximum (cis angle) deviation from orthogonality [85.75 (15)°; Table 1). The cation departs from ideal 32 symmetry by distortion of the chelate rings; comparison with the other two complexes suggests the distortion to be a concomitant of Fe—N distance. The driver of this distortion? may just as well be close contacts at the periphery between the carbonyl and the methyl substitutents to either side; these should be most spacious in (I), where Fe—N is short, but here the distortion is largest, interplanar dihedral angles between the heterocycle planes for the three ligands being 18.0 (2), 24.5 (2) and 16.5 (2)°, with Fe atom deviations from the individual planes of 0.075 (6), 0.125 (6), 0.064 (6), 0.301 (6), 0.101 (6) and 0.307 (6) Å. The O(n0)···C(n131,n231) distances lie in the range 2.806 (5)–2.896 (6) Å.
In (II), one of the ligands is supplanted by a pair of chloride donors, cis in the coordination sphere, resulting in a neutral molecule in which the Fe-donor distances (Table 2) are consistent with a high-spin rather than a low-spin electronic state. The interplanar dihedral angles between the heterocycle moieties for the two ligands are 14.62 (8) and 9.42 (8)°. The Fe atom deviations from the individual planes are very large, viz. 0.276 (3), 0.301 (3), 0.563 (3) and 0.597 (3) Å; the C10/C20 deviations are much less [0.048 (3) Å maximum], so that the ring conformations are envelopes. The O(n0)···C(n131,n231) distances are generally smaller, despite the `flatter' ligand profile [range 2.782 (3)–2.817 (3) Å]. Angular distortions from orthogonality about the metal atom are greater in (II) than in (I), most notably in the bidentate 'bite' angles [89.68 (14), 88.95 (13) and 89.9 (14) in (I), and 82.17 (6) and 82.33 (6)° in (II)], in keeping with increased Fe—N distances. Furthermore, in (I), the N···N intraligand distances are 2.801 (4), 2.763 (4) and 2.807 (4) Å, while in (II) they are 2.868 (2) and 2.881 (2) Å.
In (III), with the displacement of a further bidentate ligand, the coordination number contracts to five, with concomitant formation of a centrosymmetric µ,µ'-dichloro-bridged binuclear complex and a (chelate-N2)FeCl(µ-Cl)2 coordination environment. This five-coordinate array may be contrasted with the mononuclear (chelate-N2)Fe(HOMe)Cl2 compound, (IV), described in the preceding paper (Batten et al., 2004b), which exhibits a similar bite angle [2.864 (10) Å in (III), cf. 2.855 (3) Å in (IV)]. In (IV), the Fe atom environment is quasi-trigonal bipyramidal; in (III), it is quasi-square-pyramidal, with the pyramid apex occupied by the monodentate Cl atom and the base composed of the pair of bidentate ligands. The Fe—N distances for the two complexes are similar [2.146 (6) and 2.148 (10) Å in (III), cf. 2.108 (2) (basal) and 2.149 (2) Å (axial) in (IV)]; the Fe—Cl(terminal) distance in (III) is 2.282 (3) Å, and the bridging distances are 2.455 (4) and 2.470 (3) Å [cf. 2.3246 (7) and 2.3290 (6) Å in (IV)]. The present ligand is more nearly planar than (IV) [the interplanar dihedral angle between the pair of heterocycles is 5.0 (4)°], but the Fe atom deviations are again large [0.43 (1) and 0.36 (1) Å], so that the chelate ring is again an envelope.