In the crystal structure of the title compound, [Co(C3H4N2)6](C8H4O4)·4H2O, the hexakis(imidazole-N)cobalt(II) cation and 1,4-benzenedicarboxylate anion occupy special positions on inversion centres; two independent water molecules are in general positions. The CoII atom has almost ideal octahedral coordination formed by the N atoms of six imidazole ligands. Seven independent hydrogen bonds involving cations, anions and water molecules link all the residues in the crystal into a complex three-dimensional network.
Supporting information
CCDC reference: 185743
Key indicators
- Single-crystal X-ray study
- T = 298 K
- Mean (C-C) = 0.005 Å
- R factor = 0.058
- wR factor = 0.179
- Data-to-parameter ratio = 18.2
checkCIF results
No syntax errors found
ADDSYM reports no extra symmetry
Alert Level B:
PLAT_731 Alert B Bond Calc 0.84(6), Rep 0.850(10) .... 6.00 s.u-Ratio
O1W -H1W2 1.555 1.555
PLAT_735 Alert B D-H Calc 0.84(6), Rep 0.850(10) .... 6.00 s.u-Ratio
O1W -H1W2 1.555 1.555
PLAT_736 Alert B H...A Calc 2.04(6), Rep 2.030(10) .... 6.00 s.u-Ratio
H1W2 -O2 1.555 2.465
Alert Level C:
PLAT_369 Alert C Long C(sp2)-C(sp2) Bond C(10) - C(11) = 1.53 Ang.
PLAT_731 Alert C Bond Calc 0.85(4), Rep 0.850(10) .... 4.00 s.u-Ratio
O1W -H1W1 1.555 1.555
PLAT_731 Alert C Bond Calc 0.85(3), Rep 0.850(10) .... 3.00 s.u-Ratio
O2W -H2W1 1.555 1.555
PLAT_731 Alert C Bond Calc 0.85(4), Rep 0.850(10) .... 4.00 s.u-Ratio
O2W -H2W2 1.555 1.555
PLAT_732 Alert C Angle Calc 111(5), Rep 111(2) .... 2.50 s.u-Ratio
H1W1 -O1W -H1W2 1.555 1.555 1.555
PLAT_735 Alert C D-H Calc 0.85(4), Rep 0.850(10) .... 4.00 s.u-Ratio
O1W -H1W1 1.555 1.555
PLAT_735 Alert C D-H Calc 0.85(4), Rep 0.850(10) .... 4.00 s.u-Ratio
O2W -H2W2 1.555 1.555
PLAT_735 Alert C D-H Calc 0.85(3), Rep 0.850(10) .... 3.00 s.u-Ratio
O2W -H2W1 1.555 1.555
PLAT_736 Alert C H...A Calc 2.20(4), Rep 2.200(10) .... 4.00 s.u-Ratio
H2W2 -O2 1.555 1.555
PLAT_736 Alert C H...A Calc 1.91(4), Rep 1.910(10) .... 4.00 s.u-Ratio
H2W1 -O2 1.555 2.465
0 Alert Level A = Potentially serious problem
3 Alert Level B = Potential problem
10 Alert Level C = Please check
To a solution of CoCl2 (0.5 mmol) in 1:1 (v/v) MeOH/H2O (10 ml), a solution of imidazole (4.0 mmol) and 1,4-benzenedicarboxylic acid (0.5 mmol) in MeOH (10 ml) was added slowly with stirring for 30 min at 323 K.
Light-red polyhedral crystals precipitated within ten days (75% yield).
The C-bound H atoms were generated geometrically, and they ride on their parent
C atoms; Uiso(H) = 1.2Ueq(C). The water and the N-bound H
atoms were located and refined. For water H atoms, the O—H distance was
restrained to 0.85±0.01 Å and the H···H to 1.39±0.01 Å; the N—H bonds
are in the range 0.83—0.86 Å.
Data collection: XSCANS (Siemens, 1990); cell refinement: XSCANS; data reduction: XSCANS; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEPII (Johnson, 1976); software used to prepare material for publication: SHELXL97.
Hexakis(imidazole-N)cobalt(II) 1,4-benzenedicarboxylate tetrahydrate
top
Crystal data top
[Co(C3H4N2)6](C8H4O4)·4H2O | F(000) = 734 |
Mr = 703.60 | Dx = 1.400 Mg m−3 |
Monoclinic, P21/a | Mo Kα radiation, λ = 0.71073 Å |
a = 8.219 (4) Å | Cell parameters from 25 reflections |
b = 16.203 (7) Å | θ = 7–15° |
c = 12.991 (6) Å | µ = 0.58 mm−1 |
β = 105.19 (1)° | T = 298 K |
V = 1670 (1) Å3 | Block, red |
Z = 2 | 0.52 × 0.40 × 0.32 mm |
Data collection top
Siemens R3m four-circle diffractometer | 3159 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.051 |
Graphite monochromator | θmax = 29.0°, θmin = 2.0° |
ω scans | h = 0→11 |
Absorption correction: ψ scan (North et al., 1968) | k = 0→22 |
Tmin = 0.753, Tmax = 0.837 | l = −17→17 |
4723 measured reflections | 2 standard reflections every 150 reflections |
4433 independent reflections | intensity decay: none |
Refinement top
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.058 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.179 | w = 1/[σ2(Fo2) + (0.098P)2 + 0.6325P] where P = (Fo2 + 2Fc2)/3 |
S = 1.06 | (Δ/σ)max < 0.001 |
4433 reflections | Δρmax = 0.34 e Å−3 |
243 parameters | Δρmin = −0.73 e Å−3 |
6 restraints | Extinction correction: SHELXL97, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.073 (6) |
Crystal data top
[Co(C3H4N2)6](C8H4O4)·4H2O | V = 1670 (1) Å3 |
Mr = 703.60 | Z = 2 |
Monoclinic, P21/a | Mo Kα radiation |
a = 8.219 (4) Å | µ = 0.58 mm−1 |
b = 16.203 (7) Å | T = 298 K |
c = 12.991 (6) Å | 0.52 × 0.40 × 0.32 mm |
β = 105.19 (1)° | |
Data collection top
Siemens R3m four-circle diffractometer | 3159 reflections with I > 2σ(I) |
Absorption correction: ψ scan (North et al., 1968) | Rint = 0.051 |
Tmin = 0.753, Tmax = 0.837 | 2 standard reflections every 150 reflections |
4723 measured reflections | intensity decay: none |
4433 independent reflections | |
Refinement top
R[F2 > 2σ(F2)] = 0.058 | 6 restraints |
wR(F2) = 0.179 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.34 e Å−3 |
4433 reflections | Δρmin = −0.73 e Å−3 |
243 parameters | |
Special details top
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor
wR and goodness of fit S are based on F2, conventional
R-factors R are based on F, with F set to zero for
negative F2. The threshold expression of F2 >
σ(F2) is used only for calculating R-factors(gt) etc.
and is not relevant to the choice of reflections for refinement.
R-factors based on F2 are statistically about twice as large
as those based on F, and R- factors based on ALL data will be
even larger. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
Co1 | 0.5000 | 0.5000 | 0.5000 | 0.0375 (2) | |
O1 | 1.0719 (3) | 0.9141 (1) | 0.9645 (2) | 0.055 (1) | |
O2 | 1.2513 (3) | 0.8110 (1) | 1.0213 (2) | 0.057 (1) | |
O1w | 0.8129 (4) | 0.8034 (2) | 0.8659 (2) | 0.064 (1) | |
O2w | 1.0021 (4) | 0.7819 (2) | 1.1541 (2) | 0.065 (1) | |
N1 | 0.6927 (3) | 0.5814 (2) | 0.6006 (2) | 0.045 (1) | |
N2 | 0.8122 (4) | 0.6783 (2) | 0.7164 (2) | 0.063 (1) | |
N3 | 0.3311 (3) | 0.6060 (2) | 0.4468 (2) | 0.045 (1) | |
N4 | 0.1718 (4) | 0.6990 (2) | 0.3407 (2) | 0.058 (1) | |
N5 | 0.6059 (3) | 0.5193 (2) | 0.3646 (2) | 0.043 (1) | |
N6 | 0.6334 (4) | 0.5203 (2) | 0.1995 (2) | 0.050 (1) | |
C1 | 0.6698 (4) | 0.6523 (2) | 0.6465 (2) | 0.053 (1) | |
C2 | 0.9351 (5) | 0.6214 (3) | 0.7165 (3) | 0.067 (1) | |
C3 | 0.8609 (4) | 0.5622 (2) | 0.6448 (3) | 0.058 (1) | |
C4 | 0.5422 (4) | 0.4943 (2) | 0.2648 (2) | 0.051 (1) | |
C5 | 0.7649 (4) | 0.5663 (2) | 0.2598 (3) | 0.059 (1) | |
C6 | 0.7471 (4) | 0.5653 (2) | 0.3612 (2) | 0.050 (1) | |
C7 | 0.2936 (4) | 0.6415 (2) | 0.3507 (2) | 0.051 (1) | |
C8 | 0.1270 (5) | 0.7014 (2) | 0.4357 (3) | 0.068 (1) | |
C9 | 0.2258 (4) | 0.6444 (2) | 0.5004 (3) | 0.059 (1) | |
C10 | 1.2190 (3) | 0.8852 (2) | 0.9925 (2) | 0.040 (1) | |
C11 | 1.3655 (3) | 0.9441 (2) | 0.9957 (2) | 0.039 (1) | |
C12 | 1.3342 (4) | 1.0293 (2) | 0.9803 (2) | 0.046 (1) | |
C13 | 1.5318 (4) | 0.9155 (2) | 1.0151 (2) | 0.047 (1) | |
H1 | 0.5678 | 0.6805 | 0.6321 | 0.063* | |
H2 | 1.0466 | 0.6228 | 0.7571 | 0.081* | |
H3 | 0.9152 | 0.5158 | 0.6280 | 0.069* | |
H4 | 0.4453 | 0.4623 | 0.2428 | 0.061* | |
H5 | 0.8489 | 0.5928 | 0.2362 | 0.071* | |
H6 | 0.8188 | 0.5915 | 0.4194 | 0.060* | |
H7 | 0.3452 | 0.6282 | 0.2972 | 0.061* | |
H8 | 0.0458 | 0.7350 | 0.4523 | 0.081* | |
H9 | 0.2232 | 0.6329 | 0.5701 | 0.071* | |
H12 | 1.2245 | 1.0492 | 0.9671 | 0.055* | |
H13 | 1.5538 | 0.8594 | 1.0252 | 0.056* | |
H1w1 | 0.903 (4) | 0.830 (3) | 0.892 (4) | 0.11 (2)* | |
H1w2 | 0.793 (7) | 0.770 (4) | 0.911 (4) | 0.20 (4)* | |
H2w1 | 0.925 (4) | 0.751 (2) | 1.117 (3) | 0.09 (1)* | |
H2w2 | 1.067 (5) | 0.797 (3) | 1.116 (3) | 0.12 (2)* | |
H2n | 0.819 (5) | 0.721 (3) | 0.753 (3) | 0.08 (1)* | |
H4n | 0.127 (5) | 0.727 (2) | 0.286 (3) | 0.07 (1)* | |
H6n | 0.607 (6) | 0.508 (2) | 0.133 (4) | 0.08 (1)* | |
Atomic displacement parameters (Å2) top | U11 | U22 | U33 | U12 | U13 | U23 |
Co1 | 0.0382 (3) | 0.0423 (3) | 0.0308 (3) | −0.0014 (2) | 0.0067 (2) | −0.0029 (2) |
O1 | 0.039 (1) | 0.047 (1) | 0.076 (2) | 0.001 (1) | 0.010 (1) | 0.001 (1) |
O2 | 0.049 (1) | 0.041 (1) | 0.076 (2) | 0.000 (1) | 0.010 (1) | 0.011 (1) |
O1w | 0.068 (2) | 0.056 (1) | 0.058 (1) | −0.010 (1) | −0.002 (1) | −0.006 (1) |
O2w | 0.072 (2) | 0.066 (2) | 0.050 (1) | −0.022 (1) | 0.002 (1) | 0.002 (1) |
N1 | 0.042 (1) | 0.051 (1) | 0.039 (1) | −0.007 (1) | 0.006 (1) | −0.005 (1) |
N2 | 0.076 (2) | 0.058 (2) | 0.048 (2) | −0.019 (2) | 0.008 (1) | −0.013 (1) |
N3 | 0.045 (1) | 0.045 (1) | 0.043 (1) | 0.003 (1) | 0.006 (1) | −0.001 (1) |
N4 | 0.061 (2) | 0.050 (2) | 0.055 (2) | 0.006 (1) | 0.000 (1) | 0.005 (1) |
N5 | 0.044 (1) | 0.051 (1) | 0.035 (1) | 0.001 (1) | 0.011 (1) | 0.001 (1) |
N6 | 0.059 (2) | 0.057 (2) | 0.035 (1) | 0.000 (1) | 0.014 (1) | 0.002 (1) |
C1 | 0.058 (2) | 0.050 (2) | 0.046 (2) | −0.007 (1) | 0.008 (1) | −0.004 (1) |
C2 | 0.058 (2) | 0.080 (3) | 0.054 (2) | −0.019 (2) | −0.003 (2) | −0.007 (2) |
C3 | 0.045 (2) | 0.071 (2) | 0.051 (2) | −0.002 (2) | 0.004 (1) | −0.008 (2) |
C4 | 0.061 (2) | 0.053 (2) | 0.037 (1) | −0.008 (1) | 0.010 (1) | −0.004 (1) |
C5 | 0.056 (2) | 0.075 (2) | 0.048 (2) | −0.006 (2) | 0.018 (1) | 0.011 (2) |
C6 | 0.045 (2) | 0.062 (2) | 0.040 (1) | −0.003 (1) | 0.005 (1) | 0.004 (1) |
C7 | 0.053 (2) | 0.049 (2) | 0.047 (2) | 0.002 (1) | 0.007 (1) | 0.003 (1) |
C8 | 0.070 (2) | 0.064 (2) | 0.065 (2) | 0.021 (2) | 0.010 (2) | −0.005 (2) |
C9 | 0.067 (2) | 0.061 (2) | 0.047 (2) | 0.014 (2) | 0.011 (1) | −0.002 (1) |
C10 | 0.042 (1) | 0.041 (1) | 0.036 (1) | 0.002 (1) | 0.011 (1) | 0.000 (1) |
C11 | 0.041 (1) | 0.040 (1) | 0.037 (1) | 0.002 (1) | 0.012 (1) | −0.001 (1) |
C12 | 0.040 (1) | 0.043 (1) | 0.057 (2) | 0.006 (1) | 0.014 (1) | 0.002 (1) |
C13 | 0.045 (2) | 0.036 (1) | 0.059 (2) | 0.004 (1) | 0.014 (1) | 0.003 (1) |
Geometric parameters (Å, º) top
Co1—N1 | 2.207 (2) | C10—C11 | 1.528 (4) |
Co1—N1i | 2.207 (2) | C11—C13 | 1.402 (4) |
Co1—N3 | 2.203 (2) | C11—C12 | 1.408 (4) |
Co1—N3i | 2.203 (2) | C12—C13ii | 1.408 (4) |
Co1—N5 | 2.180 (2) | C13—C12ii | 1.408 (4) |
Co1—N5i | 2.180 (2) | O1w—H1w1 | 0.85 (1) |
O1—C10 | 1.258 (3) | O1w—H1w2 | 0.85 (1) |
O2—C10 | 1.266 (3) | O2w—H2w1 | 0.85 (1) |
N1—C1 | 1.330 (4) | O2w—H2w2 | 0.85 (1) |
N1—C3 | 1.386 (4) | N2—H2n | 0.83 (4) |
N2—C1 | 1.347 (4) | N4—H4n | 0.84 (4) |
N2—C2 | 1.367 (5) | N6—H6n | 0.86 (5) |
N3—C7 | 1.336 (4) | C1—H1 | 0.9300 |
N3—C9 | 1.392 (4) | C2—H2 | 0.9300 |
N4—C7 | 1.348 (4) | C3—H3 | 0.9300 |
N4—C8 | 1.377 (5) | C4—H4 | 0.9300 |
N5—C4 | 1.328 (4) | C5—H5 | 0.9300 |
N5—C6 | 1.390 (4) | C6—H6 | 0.9300 |
N6—C4 | 1.339 (4) | C7—H7 | 0.9300 |
N6—C5 | 1.377 (4) | C8—H8 | 0.9300 |
C2—C3 | 1.365 (5) | C9—H9 | 0.9300 |
C5—C6 | 1.363 (4) | C12—H12 | 0.9300 |
C8—C9 | 1.364 (5) | C13—H13 | 0.9300 |
| | | |
N1—Co1—N1i | 180.0 (1) | O1—C10—C11 | 117.7 (2) |
N1—Co1—N3 | 90.9 (1) | O2—C10—C11 | 118.9 (2) |
N1—Co1—N3i | 89.1 (1) | C13—C11—C12 | 118.8 (2) |
N1—Co1—N5 | 90.9 (1) | C13—C11—C10 | 121.5 (2) |
N1—Co1—N5i | 89.1 (1) | C12—C11—C10 | 119.7 (2) |
N1i—Co1—N3 | 89.1 (1) | C13ii—C12—C11 | 120.3 (3) |
N1i—Co1—N3i | 90.9 (1) | C11—C13—C12ii | 120.9 (3) |
N1i—Co1—N5 | 89.1 (1) | H1w1—O1w—H1w2 | 111 (2) |
N1i—Co1—N5i | 90.9 (1) | H2w1—O2w—H2w2 | 109 (2) |
N3—Co1—N3i | 180.000 (1) | C1—N2—H2n | 124 (3) |
N3—Co1—N5 | 89.3 (1) | C2—N2—H2n | 128 (3) |
N3—Co1—N5i | 90.7 (1) | C7—N4—H4n | 127 (3) |
N3i—Co1—N5 | 90.7 (1) | C8—N4—H4n | 125 (3) |
N3i—Co1—N5i | 89.3 (1) | C4—N6—H6n | 122 (3) |
N5—Co1—N5i | 180.000 (1) | C5—N6—H6n | 131 (3) |
C1—N1—C3 | 104.5 (3) | N1—C1—H1 | 124.1 |
C1—N1—Co1 | 128.1 (2) | N2—C1—H1 | 124.1 |
C3—N1—Co1 | 126.5 (2) | C3—C2—H2 | 127.0 |
C1—N2—C2 | 107.5 (3) | N2—C2—H2 | 127.0 |
C7—N3—C9 | 104.7 (3) | C2—C3—H3 | 124.9 |
C7—N3—Co1 | 127.0 (2) | N1—C3—H3 | 124.9 |
C9—N3—Co1 | 128.0 (2) | N5—C4—H4 | 123.9 |
C7—N4—C8 | 107.4 (3) | N6—C4—H4 | 123.9 |
C4—N5—C6 | 104.6 (2) | C6—C5—H5 | 127.0 |
C4—N5—Co1 | 127.2 (2) | N6—C5—H5 | 127.0 |
C6—N5—Co1 | 128.0 (2) | C5—C6—H6 | 125.1 |
C4—N6—C5 | 107.3 (3) | N5—C6—H6 | 125.1 |
N1—C1—N2 | 111.9 (3) | N3—C7—H7 | 124.1 |
C3—C2—N2 | 106.0 (3) | N4—C7—H7 | 124.1 |
C2—C3—N1 | 110.1 (3) | C9—C8—H8 | 126.9 |
N5—C4—N6 | 112.3 (3) | N4—C8—H8 | 126.9 |
C6—C5—N6 | 106.0 (3) | C8—C9—H9 | 125.0 |
C5—C6—N5 | 109.9 (3) | N3—C9—H9 | 125.0 |
N3—C7—N4 | 111.8 (3) | C13ii—C12—H12 | 119.9 |
C9—C8—N4 | 106.1 (3) | C11—C12—H12 | 119.9 |
C8—C9—N3 | 110.0 (3) | C11—C13—H13 | 119.6 |
O1—C10—O2 | 123.4 (3) | C12ii—C13—H13 | 119.6 |
| | | |
N5—Co1—N1—C1 | 117.3 (3) | C1—N2—C2—C3 | 0.3 (4) |
N5i—Co1—N1—C1 | −62.7 (3) | N2—C2—C3—N1 | −0.4 (4) |
N3—Co1—N1—C1 | 28.1 (3) | C1—N1—C3—C2 | 0.4 (4) |
N3i—Co1—N1—C1 | −151.9 (3) | Co1—N1—C3—C2 | −169.7 (2) |
N5—Co1—N1—C3 | −74.9 (3) | C6—N5—C4—N6 | 0.6 (4) |
N5i—Co1—N1—C3 | 105.1 (3) | Co1—N5—C4—N6 | 176.4 (2) |
N3—Co1—N1—C3 | −164.2 (3) | C5—N6—C4—N5 | −0.7 (4) |
N3i—Co1—N1—C3 | 15.8 (3) | C4—N6—C5—C6 | 0.5 (4) |
N5—Co1—N3—C7 | 16.7 (3) | N6—C5—C6—N5 | −0.1 (4) |
N5i—Co1—N3—C7 | −163.3 (3) | C4—N5—C6—C5 | −0.3 (4) |
N1i—Co1—N3—C7 | −72.4 (3) | Co1—N5—C6—C5 | −176.0 (2) |
N1—Co1—N3—C7 | 107.6 (3) | C9—N3—C7—N4 | −0.3 (4) |
N5—Co1—N3—C9 | −171.5 (3) | Co1—N3—C7—N4 | 173.1 (2) |
N5i—Co1—N3—C9 | 8.5 (3) | C8—N4—C7—N3 | 0.0 (4) |
N1i—Co1—N3—C9 | 99.4 (3) | C7—N4—C8—C9 | 0.2 (4) |
N1—Co1—N3—C9 | −80.6 (3) | N4—C8—C9—N3 | −0.4 (4) |
N3—Co1—N5—C4 | −81.7 (3) | C7—N3—C9—C8 | 0.4 (4) |
N3i—Co1—N5—C4 | 98.3 (3) | Co1—N3—C9—C8 | −172.8 (2) |
N1i—Co1—N5—C4 | 7.4 (3) | O1—C10—C11—C13 | −173.3 (3) |
N1—Co1—N5—C4 | −172.6 (3) | O2—C10—C11—C13 | 9.1 (4) |
N3—Co1—N5—C6 | 93.1 (3) | O1—C10—C11—C12 | 7.5 (4) |
N3i—Co1—N5—C6 | −86.9 (3) | O2—C10—C11—C12 | −170.0 (3) |
N1i—Co1—N5—C6 | −177.8 (3) | C13—C11—C12—C13ii | −0.2 (5) |
N1—Co1—N5—C6 | 2.2 (3) | C10—C11—C12—C13ii | 179.0 (3) |
C3—N1—C1—N2 | −0.2 (4) | C12—C11—C13—C12ii | 0.2 (5) |
Co1—N1—C1—N2 | 169.6 (2) | C10—C11—C13—C12ii | −179.0 (3) |
C2—N2—C1—N1 | 0.0 (4) | | |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+3, −y+2, −z+2. |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2n···O1w | 0.83 (4) | 2.00 (4) | 2.806 (4) | 165 (4) |
N4—H4n···O2wiii | 0.84 (4) | 1.97 (4) | 2.802 (4) | 173 (4) |
N6—H6n···O1iv | 0.86 (5) | 2.25 (5) | 2.909 (4) | 133 (4) |
O1w—H1w1···O1 | 0.85 (1) | 2.00 (2) | 2.821 (3) | 164 (5) |
O1w—H1w2···O2v | 0.85 (1) | 2.03 (1) | 2.880 (4) | 178 (5) |
O2w—H2w2···O2 | 0.85 (1) | 2.20 (1) | 3.041 (4) | 169 (5) |
O2w—H2w1···O2v | 0.85 (1) | 1.91 (1) | 2.761 (3) | 174 (4) |
Symmetry codes: (iii) x−1, y, z−1; (iv) −x+3/2, y−1/2, −z+1; (v) x−1/2, −y+3/2, z. |
Experimental details
Crystal data |
Chemical formula | [Co(C3H4N2)6](C8H4O4)·4H2O |
Mr | 703.60 |
Crystal system, space group | Monoclinic, P21/a |
Temperature (K) | 298 |
a, b, c (Å) | 8.219 (4), 16.203 (7), 12.991 (6) |
β (°) | 105.19 (1) |
V (Å3) | 1670 (1) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.58 |
Crystal size (mm) | 0.52 × 0.40 × 0.32 |
|
Data collection |
Diffractometer | Siemens R3m four-circle diffractometer |
Absorption correction | ψ scan (North et al., 1968) |
Tmin, Tmax | 0.753, 0.837 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4723, 4433, 3159 |
Rint | 0.051 |
(sin θ/λ)max (Å−1) | 0.682 |
|
Refinement |
R[F2 > 2σ(F2)], wR(F2), S | 0.058, 0.179, 1.06 |
No. of reflections | 4433 |
No. of parameters | 243 |
No. of restraints | 6 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.34, −0.73 |
Selected geometric parameters (Å, º) topCo1—N1 | 2.207 (2) | Co1—N5 | 2.180 (2) |
Co1—N3 | 2.203 (2) | | |
| | | |
N1—Co1—N3 | 90.9 (1) | N3—Co1—N5 | 89.3 (1) |
N1—Co1—N5 | 90.9 (1) | | |
Hydrogen-bond geometry (Å, º) top
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2n···O1w | 0.83 (4) | 2.00 (4) | 2.806 (4) | 165 (4) |
N4—H4n···O2wi | 0.84 (4) | 1.97 (4) | 2.802 (4) | 173 (4) |
N6—H6n···O1ii | 0.86 (5) | 2.25 (5) | 2.909 (4) | 133 (4) |
O1w—H1w1···O1 | 0.85 (1) | 2.00 (2) | 2.821 (3) | 164 (5) |
O1w—H1w2···O2iii | 0.85 (1) | 2.03 (1) | 2.880 (4) | 178 (5) |
O2w—H2w2···O2 | 0.85 (1) | 2.20 (1) | 3.041 (4) | 169 (5) |
O2w—H2w1···O2iii | 0.85 (1) | 1.91 (1) | 2.761 (3) | 174 (4) |
Symmetry codes: (i) x−1, y, z−1; (ii) −x+3/2, y−1/2, −z+1; (iii) x−1/2, −y+3/2, z. |
Pronounced interest has recently been focused on the crystal engineering of supramolecular architectures organized by coordination covalent or supramolecular contacts (such as hydrogen bonding, π–π interaction etc.) (Aakeroy, 1997; Beatty, 2001; Braga et al., 1998; Desiraju, 1996; Janiak, 2000; Moulton & Zaworotko, 2001). Currently, the most prevalent strategy for engineering the structures of crystals takes advantage of directional intermolecular interactions between molecules as the principal means of controlling molecular assembly during crystallization. We report here the synthesis and structure of hexakis(imidazole-N)cobalt(II) 1,4-benzenedicarboxylate tetrahydrate, [Co(Him)6](tp)·4H2O, (I) (Him = imidazole and tp = 1,4-benzenedicarboxylate).
The crystal structure of (I) is built of mononuclear [Co(Him)6]2+ dications, tp2- dianions and lattice water molecules. As shown in Fig. 1, the CoII ion has an almost ideal octahedral environment formed by six imidazole N atoms. The Co—N bond distances vary from 2.180 (2) to 2.207 (2) Å, and the cis-N—Co—N bond angles are in the range from 89.1 (1) to 90.9 (1)°. The Co—N(Him) bond distances are similar to the corresponding values reported previously in the range 2.140–2.188 Å in [Co(Him)6](MeCO2)2·H2O (Gadet & Lefebvre-Soubeyran, 1974), [Co(Him)6](NO3)2 (Prince et al., 1972), [Co(Him)6](CO3)·5H2O (Strandberg & Lundberg, 1971), [Co(Him)6](PhCO2)2 (Wang et al., 1999) and [Co(Him)6](ClO4)2 (Suresh & Venkatasubramanian, 1997).
In the crystal of the title compound, there is an extensive hydrogen-bonding system, involving all types of species, viz. the [Co(Him)6]2+ cations, tp2- anions, and lattice water molecules. Each Him unit of [Co(Him)6]2+ forms one donor hydrogen bond with adjacent water molecule or tp2- anion, and each tp2- anion forms eight acceptor hydrogen bonds with water molecules and/or cations. Each water molecule forms one acceptor hydrogen bond with a Him unit and two donor hydrogen bonds with tp2- anions. Thus, the structure of the title compound provides an interesting three-dimensional supramolecular architecture driven by the extensive hydrogen-bonding system (Fig. 2).