Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807022982/hg2235sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807022982/hg2235Isup2.hkl |
CCDC reference: 655591
A mixture of 4,4'-bipyridine (0.25 g) and Eu(NO3)3 (0.28 g) in the molar ratio of 2:1 was added to methanol (20 ml). The mixture was heated at 350 K for 5 h under reflux with stirring. The resulting solution was then filtered. Single crystals suitable for X-ray diffraction analysis formed after a week by slow evaporation of the solvent.
The H atoms were positioned geometrically and treated as riding on their parent atoms, with C—H = 0.93 Å (pyridine ring) and 0.96 Å(methyl), and N—H = 0.86 Å (amine group), and with Uiso(H) = 1.2Ueq(C). H11 and H11A were defined as first and second disordered parts in a 50% occupation ratio and fully refined.
Rare earth complexes with luminescent properties feature long emission life but narrow emission bands. Complexes of different rare earth metals yield each of the three basic colors (Eu3+ for red, Tb3+ for green and Eu2+ for blue) and represent potential candidates for the preparation of new generational display and other luminescent instruments (Shaheen et al., 1999; Adachi et al.,2000). Past research shows it is important to select ligands which can match the central metal ions in energy and thus lead to 'antenna effect' (Sabbatini et al.,1993). Complexes of EuIII ion with 4,4'-bipyridine or its dioxide derivative as a bidentate ligand have been reported (Cotton et al.,2003), but to our knowledge, complexes of EuIII with 4,4'-bipyridyl as monodentate ligand have not been reported. In this paper we report the crystal structure of the title complex. As shown in Fig. 1, in this complex every EuIII ion is ten coordinate defined by two N atoms from two different monodentate 4,4'-bipyridine molecules and eight O atoms from four different bidentate nitrate anions. The Eu—N bond length is 2.626 (2) Å. The Eu—O bond lengths range from 2.4620 (17) to 2.5160 (17) Å. The C2 symmetry element existing in the crystal structure goes through the EuIIIions. One hydrogen ion is distributed between the two non-coordinated N atoms of the 4,4'-bipyridine ligands in 50% occupation ratio and takes part in forming an N—H···N strong intermolecular hydrogen bond to give a zigzag array. As depicted in Fig. 2, the zigzag strings are found to extend by forming strong hydrogen bonds described above along the a axis, in the packing structure of the crystal. Weak hydrogen bonds between nitrate O atoms and H atoms of pyridine rings connect different strings in adjacent molecules to form a three-dimensional network.
For related literature, see: Adachi et al. (2000); Cotton et al. (2003); Sabbatini et al. (1993); Shaheen et al. (1999).
Data collection: SMART (Bruker, 2000); cell refinement: SMART; data reduction: SAINT (Bruker, 2000); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: SHELXL97; software used to prepare material for publication: SHELXL97.
Fig. 1. The asymmetric unit of (I), showing 35% probability displacement ellipsoids. | |
Fig. 2. The one dimensional zigzag string of the title complex extending along the a axis. |
[Eu(NO3)4(C10H9N2)(C10H8N2)] | Z = 4 |
Mr = 713.38 | F(000) = 1408 |
Monoclinic, C2/c | Dx = 1.879 Mg m−3 |
Hall symbol: -C 2yc | Mo Kα radiation, λ = 0.71073 Å |
a = 20.136 (5) Å | θ = 2.1–28.4° |
b = 7.8079 (14) Å | µ = 2.57 mm−1 |
c = 18.310 (3) Å | T = 293 K |
β = 118.834 (2)° | Block, yellow |
V = 2521.8 (9) Å3 | 0.28 × 0.26 × 0.21 mm |
Bruker APEXII area-detector diffractometer | 2211 independent reflections |
Radiation source: fine-focus sealed tube | 2153 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.051 |
φ and ω scans | θmax = 25.2°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | h = −23→24 |
Tmin = 0.533, Tmax = 0.619 | k = −9→9 |
7437 measured reflections | l = −21→21 |
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)] = 0.018 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.049 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | w = 1/[σ2(Fo2) + (0.031P)2 + 0.9897P] where P = (Fo2 + 2Fc2)/3 |
2211 reflections | (Δ/σ)max < 0.001 |
191 parameters | Δρmax = 0.50 e Å−3 |
1 restraint | Δρmin = −0.56 e Å−3 |
[Eu(NO3)4(C10H9N2)(C10H8N2)] | V = 2521.8 (9) Å3 |
Mr = 713.38 | Z = 4 |
Monoclinic, C2/c | Mo Kα radiation |
a = 20.136 (5) Å | µ = 2.57 mm−1 |
b = 7.8079 (14) Å | T = 293 K |
c = 18.310 (3) Å | 0.28 × 0.26 × 0.21 mm |
β = 118.834 (2)° |
Bruker APEXII area-detector diffractometer | 2211 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | 2153 reflections with I > 2σ(I) |
Tmin = 0.533, Tmax = 0.619 | Rint = 0.051 |
7437 measured reflections |
R[F2 > 2σ(F2)] = 0.018 | 1 restraint |
wR(F2) = 0.049 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.02 | Δρmax = 0.50 e Å−3 |
2211 reflections | Δρmin = −0.56 e Å−3 |
191 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
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. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
H11 | 0.243 (7) | 1.222 (16) | 0.018 (7) | 0.13 (5)* | 0.50 (10) |
Eu1 | 0.0000 | 0.338536 (17) | 0.2500 | 0.03085 (8) | |
O4 | 0.00208 (11) | 0.3047 (3) | 0.11446 (11) | 0.0480 (4) | |
O3 | 0.12196 (11) | 0.2141 (3) | 0.27142 (11) | 0.0468 (4) | |
O6 | −0.09200 (10) | 0.4418 (2) | 0.11018 (11) | 0.0478 (4) | |
N2 | −0.05805 (13) | 0.3852 (3) | 0.07139 (12) | 0.0427 (5) | |
N1 | 0.12672 (12) | 0.0900 (3) | 0.31810 (12) | 0.0407 (5) | |
O1 | 0.07166 (11) | 0.0719 (3) | 0.33171 (13) | 0.0554 (5) | |
O2 | 0.18155 (12) | −0.0037 (3) | 0.34727 (12) | 0.0622 (5) | |
O5 | −0.08280 (14) | 0.4120 (3) | −0.00236 (11) | 0.0702 (6) | |
N3 | 0.06444 (12) | 0.6021 (3) | 0.22022 (12) | 0.0399 (4) | |
C3 | 0.12606 (15) | 0.8304 (3) | 0.15042 (14) | 0.0340 (5) | |
C4 | 0.05361 (16) | 0.8533 (3) | 0.13925 (16) | 0.0396 (6) | |
H4 | 0.0244 | 0.9459 | 0.1087 | 0.048* | |
C2 | 0.16818 (15) | 0.6951 (3) | 0.19990 (15) | 0.0412 (5) | |
H2 | 0.2178 | 0.6777 | 0.2108 | 0.049* | |
C5 | 0.02512 (15) | 0.7364 (3) | 0.17410 (15) | 0.0411 (5) | |
H5 | −0.0241 | 0.7521 | 0.1649 | 0.049* | |
C1 | 0.13539 (14) | 0.5861 (4) | 0.23286 (15) | 0.0437 (6) | |
H1 | 0.1645 | 0.4959 | 0.2660 | 0.052* | |
C6 | 0.15731 (13) | 0.9448 (3) | 0.10950 (13) | 0.0347 (5) | |
C7 | 0.20534 (15) | 0.8784 (4) | 0.08172 (15) | 0.0399 (5) | |
H7 | 0.2178 | 0.7627 | 0.0882 | 0.048* | |
C10 | 0.13999 (17) | 1.1166 (4) | 0.09719 (19) | 0.0509 (7) | |
H10 | 0.1071 | 1.1645 | 0.1138 | 0.061* | |
N4 | 0.21769 (15) | 1.1517 (3) | 0.03422 (15) | 0.0461 (6) | |
C8 | 0.23413 (14) | 0.9869 (4) | 0.04437 (15) | 0.0444 (6) | |
H8 | 0.2661 | 0.9424 | 0.0257 | 0.053* | |
C9 | 0.17182 (18) | 1.2178 (4) | 0.05995 (19) | 0.0571 (7) | |
H9 | 0.1608 | 1.3343 | 0.0529 | 0.068* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Eu1 | 0.03323 (11) | 0.02896 (11) | 0.04004 (11) | 0.000 | 0.02536 (8) | 0.000 |
O4 | 0.0522 (12) | 0.0524 (11) | 0.0503 (9) | 0.0116 (9) | 0.0333 (9) | 0.0021 (8) |
O3 | 0.0481 (10) | 0.0443 (10) | 0.0590 (10) | 0.0099 (9) | 0.0345 (8) | 0.0132 (9) |
O6 | 0.0424 (10) | 0.0494 (11) | 0.0557 (9) | 0.0070 (8) | 0.0268 (8) | −0.0007 (8) |
N2 | 0.0485 (13) | 0.0384 (11) | 0.0410 (10) | −0.0004 (10) | 0.0214 (10) | −0.0026 (9) |
N1 | 0.0442 (12) | 0.0352 (12) | 0.0429 (10) | 0.0027 (9) | 0.0210 (9) | −0.0010 (9) |
O1 | 0.0572 (12) | 0.0441 (11) | 0.0790 (12) | 0.0028 (9) | 0.0442 (10) | 0.0143 (10) |
O2 | 0.0588 (12) | 0.0558 (13) | 0.0664 (11) | 0.0266 (10) | 0.0258 (9) | 0.0138 (10) |
O5 | 0.0959 (17) | 0.0657 (15) | 0.0396 (10) | 0.0070 (13) | 0.0253 (10) | 0.0010 (10) |
N3 | 0.0473 (13) | 0.0380 (11) | 0.0475 (10) | −0.0024 (9) | 0.0332 (9) | 0.0034 (9) |
C3 | 0.0401 (13) | 0.0324 (13) | 0.0387 (11) | −0.0038 (8) | 0.0262 (10) | −0.0016 (8) |
C4 | 0.0447 (15) | 0.0358 (13) | 0.0524 (13) | 0.0048 (9) | 0.0346 (12) | 0.0064 (10) |
C2 | 0.0358 (13) | 0.0450 (14) | 0.0475 (12) | 0.0003 (10) | 0.0238 (11) | 0.0091 (11) |
C5 | 0.0466 (14) | 0.0350 (13) | 0.0578 (13) | 0.0022 (11) | 0.0382 (12) | 0.0027 (11) |
C1 | 0.0404 (14) | 0.0450 (16) | 0.0480 (12) | 0.0022 (11) | 0.0230 (11) | 0.0140 (11) |
C6 | 0.0349 (11) | 0.0372 (12) | 0.0390 (10) | −0.0024 (9) | 0.0234 (9) | 0.0022 (9) |
C7 | 0.0405 (13) | 0.0396 (12) | 0.0486 (12) | 0.0024 (10) | 0.0286 (11) | 0.0041 (10) |
C10 | 0.0651 (19) | 0.0383 (13) | 0.0764 (18) | 0.0059 (13) | 0.0558 (16) | 0.0090 (13) |
N4 | 0.0494 (14) | 0.0488 (15) | 0.0536 (12) | −0.0056 (9) | 0.0356 (11) | 0.0093 (9) |
C8 | 0.0412 (13) | 0.0527 (16) | 0.0513 (12) | −0.0010 (11) | 0.0318 (11) | 0.0043 (11) |
C9 | 0.073 (2) | 0.0411 (15) | 0.0819 (18) | 0.0055 (14) | 0.0567 (17) | 0.0146 (15) |
Eu1—O6i | 2.4620 (18) | C3—C4 | 1.383 (4) |
Eu1—O6 | 2.4620 (18) | C3—C2 | 1.384 (3) |
Eu1—O3 | 2.4900 (19) | C3—C6 | 1.487 (3) |
Eu1—O3i | 2.4900 (19) | C4—C5 | 1.386 (3) |
Eu1—O4i | 2.5159 (18) | C4—H4 | 0.9300 |
Eu1—O4 | 2.5160 (18) | C2—C1 | 1.381 (4) |
Eu1—O1i | 2.563 (2) | C2—H2 | 0.9300 |
Eu1—O1 | 2.563 (2) | C5—H5 | 0.9300 |
Eu1—N3 | 2.626 (2) | C1—H1 | 0.9300 |
Eu1—N3i | 2.626 (2) | C6—C10 | 1.377 (4) |
Eu1—N2i | 2.917 (2) | C6—C7 | 1.392 (3) |
Eu1—N1i | 2.960 (2) | C7—C8 | 1.380 (4) |
O4—N2 | 1.250 (3) | C7—H7 | 0.9300 |
O3—N1 | 1.265 (3) | C10—C9 | 1.386 (4) |
O6—N2 | 1.279 (3) | C10—H10 | 0.9300 |
N2—O5 | 1.211 (3) | N4—C8 | 1.319 (4) |
N1—O2 | 1.213 (3) | N4—C9 | 1.327 (4) |
N1—O1 | 1.256 (3) | N4—H11 | 0.89 (2) |
N3—C1 | 1.338 (3) | C8—H8 | 0.9300 |
N3—C5 | 1.340 (4) | C9—H9 | 0.9300 |
O6i—Eu1—O6 | 141.76 (9) | O6—Eu1—N1i | 73.34 (6) |
O6i—Eu1—O3 | 76.92 (6) | O3—Eu1—N1i | 113.25 (7) |
O6—Eu1—O3 | 118.81 (6) | O3i—Eu1—N1i | 24.97 (6) |
O6i—Eu1—O3i | 118.81 (6) | O4i—Eu1—N1i | 85.74 (6) |
O6—Eu1—O3i | 76.92 (6) | O4—Eu1—N1i | 86.37 (6) |
O3—Eu1—O3i | 134.06 (10) | O1i—Eu1—N1i | 24.99 (6) |
O6i—Eu1—O4i | 51.01 (6) | O1—Eu1—N1i | 80.89 (6) |
O6—Eu1—O4i | 134.26 (7) | N3—Eu1—N1i | 146.93 (6) |
O3—Eu1—O4i | 106.74 (6) | N3i—Eu1—N1i | 100.91 (7) |
O3i—Eu1—O4i | 68.29 (6) | N2i—Eu1—N1i | 110.62 (6) |
O6i—Eu1—O4 | 134.26 (7) | N2—O4—Eu1 | 95.61 (13) |
O6—Eu1—O4 | 51.01 (6) | N1—O3—Eu1 | 98.80 (14) |
O3—Eu1—O4 | 68.29 (6) | N2—O6—Eu1 | 97.39 (14) |
O3i—Eu1—O4 | 106.74 (6) | O5—N2—O4 | 122.9 (2) |
O4i—Eu1—O4 | 167.96 (9) | O5—N2—O6 | 121.1 (2) |
O6i—Eu1—O1i | 143.35 (6) | O4—N2—O6 | 115.97 (19) |
O6—Eu1—O1i | 74.31 (7) | O2—N1—O1 | 123.2 (2) |
O3—Eu1—O1i | 90.56 (6) | O2—N1—O3 | 121.1 (2) |
O3i—Eu1—O1i | 49.94 (6) | O1—N1—O3 | 115.7 (2) |
O4i—Eu1—O1i | 102.59 (6) | N1—O1—Eu1 | 95.47 (13) |
O4—Eu1—O1i | 67.15 (7) | C1—N3—C5 | 116.0 (2) |
O6i—Eu1—O1 | 74.31 (7) | C1—N3—Eu1 | 118.97 (17) |
O6—Eu1—O1 | 143.35 (6) | C5—N3—Eu1 | 122.90 (16) |
O3—Eu1—O1 | 49.94 (6) | C4—C3—C2 | 117.7 (2) |
O3i—Eu1—O1 | 90.56 (6) | C4—C3—C6 | 121.4 (2) |
O4i—Eu1—O1 | 67.14 (7) | C2—C3—C6 | 120.9 (2) |
O4—Eu1—O1 | 102.60 (6) | C3—C4—C5 | 119.2 (2) |
O1i—Eu1—O1 | 71.41 (10) | C3—C4—H4 | 120.4 |
O6i—Eu1—N3 | 76.11 (6) | C5—C4—H4 | 120.4 |
O6—Eu1—N3 | 74.15 (7) | C1—C2—C3 | 119.0 (2) |
O3—Eu1—N3 | 77.88 (7) | C1—C2—H2 | 120.5 |
O3i—Eu1—N3 | 145.24 (7) | C3—C2—H2 | 120.5 |
O4i—Eu1—N3 | 122.13 (6) | N3—C5—C4 | 123.7 (2) |
O4—Eu1—N3 | 68.44 (7) | N3—C5—H5 | 118.1 |
O1i—Eu1—N3 | 135.27 (6) | C4—C5—H5 | 118.1 |
O1—Eu1—N3 | 124.20 (7) | N3—C1—C2 | 124.2 (2) |
O6i—Eu1—N3i | 74.15 (7) | N3—C1—H1 | 117.9 |
O6—Eu1—N3i | 76.11 (6) | C2—C1—H1 | 117.9 |
O3—Eu1—N3i | 145.24 (7) | C10—C6—C7 | 117.9 (2) |
O3i—Eu1—N3i | 77.88 (7) | C10—C6—C3 | 122.2 (2) |
O4i—Eu1—N3i | 68.44 (7) | C7—C6—C3 | 119.9 (2) |
O4—Eu1—N3i | 122.13 (6) | C8—C7—C6 | 119.0 (3) |
O1i—Eu1—N3i | 124.20 (6) | C8—C7—H7 | 120.5 |
O1—Eu1—N3i | 135.27 (6) | C6—C7—H7 | 120.5 |
N3—Eu1—N3i | 76.83 (9) | C6—C10—C9 | 119.7 (3) |
O6i—Eu1—N2i | 25.77 (6) | C6—C10—H10 | 120.2 |
O6—Eu1—N2i | 144.95 (6) | C9—C10—H10 | 120.2 |
O3—Eu1—N2i | 92.34 (6) | C8—N4—C9 | 120.0 (2) |
O3i—Eu1—N2i | 93.26 (6) | C8—N4—H11 | 120 (10) |
O4i—Eu1—N2i | 25.24 (6) | C9—N4—H11 | 119 (10) |
O4—Eu1—N2i | 158.55 (7) | N4—C8—C7 | 122.1 (2) |
O1i—Eu1—N2i | 124.35 (7) | N4—C8—H8 | 118.9 |
O1—Eu1—N2i | 68.82 (7) | C7—C8—H8 | 118.9 |
N3—Eu1—N2i | 99.43 (6) | N4—C9—C10 | 121.3 (3) |
N3i—Eu1—N2i | 68.91 (6) | N4—C9—H9 | 119.4 |
O6i—Eu1—N1i | 135.74 (6) | C10—C9—H9 | 119.4 |
O6i—Eu1—O4—N2 | −127.84 (16) | N3—Eu1—O1—N1 | −23.62 (17) |
O6—Eu1—O4—N2 | 0.63 (14) | N3i—Eu1—O1—N1 | −130.75 (14) |
O3—Eu1—O4—N2 | −171.12 (17) | N2i—Eu1—O1—N1 | −110.70 (15) |
O3i—Eu1—O4—N2 | 57.44 (17) | N1i—Eu1—O1—N1 | 132.90 (14) |
O4i—Eu1—O4—N2 | 121.24 (16) | O6i—Eu1—N3—C1 | 73.72 (18) |
O1i—Eu1—O4—N2 | 88.55 (16) | O6—Eu1—N3—C1 | −130.59 (19) |
O1—Eu1—O4—N2 | 151.89 (15) | O3—Eu1—N3—C1 | −5.60 (17) |
N3—Eu1—O4—N2 | −86.04 (16) | O3i—Eu1—N3—C1 | −165.32 (15) |
N3i—Eu1—O4—N2 | −28.55 (19) | O4i—Eu1—N3—C1 | 96.69 (18) |
N2i—Eu1—O4—N2 | −144.4 (2) | O4—Eu1—N3—C1 | −76.82 (18) |
N1i—Eu1—O4—N2 | 72.07 (16) | O1i—Eu1—N3—C1 | −83.9 (2) |
O6i—Eu1—O3—N1 | 78.56 (15) | O1—Eu1—N3—C1 | 14.0 (2) |
O6—Eu1—O3—N1 | −139.02 (14) | N3i—Eu1—N3—C1 | 150.4 (2) |
O3i—Eu1—O3—N1 | −39.07 (13) | N2i—Eu1—N3—C1 | 84.77 (18) |
O4i—Eu1—O3—N1 | 36.66 (16) | N1i—Eu1—N3—C1 | −119.82 (18) |
O4—Eu1—O3—N1 | −131.72 (16) | O6i—Eu1—N3—C5 | −123.43 (19) |
O1i—Eu1—O3—N1 | −66.67 (15) | O6—Eu1—N3—C5 | 32.26 (18) |
O1—Eu1—O3—N1 | −1.81 (13) | O3—Eu1—N3—C5 | 157.24 (19) |
N3—Eu1—O3—N1 | 156.89 (16) | O3i—Eu1—N3—C5 | −2.5 (2) |
N3i—Eu1—O3—N1 | 112.80 (16) | O4i—Eu1—N3—C5 | −100.46 (19) |
N2i—Eu1—O3—N1 | 57.74 (15) | O4—Eu1—N3—C5 | 86.02 (18) |
N1i—Eu1—O3—N1 | −55.91 (18) | O1i—Eu1—N3—C5 | 78.9 (2) |
O6i—Eu1—O6—N2 | 114.43 (15) | O1—Eu1—N3—C5 | 176.88 (17) |
O3—Eu1—O6—N2 | 8.13 (17) | N3i—Eu1—N3—C5 | −46.80 (16) |
O3i—Eu1—O6—N2 | −125.26 (15) | N2i—Eu1—N3—C5 | −112.38 (18) |
O4i—Eu1—O6—N2 | −166.10 (13) | N1i—Eu1—N3—C5 | 43.0 (2) |
O4—Eu1—O6—N2 | −0.62 (14) | C2—C3—C4—C5 | −3.2 (4) |
O1i—Eu1—O6—N2 | −73.66 (15) | C6—C3—C4—C5 | 175.7 (2) |
O1—Eu1—O6—N2 | −52.45 (19) | C4—C3—C2—C1 | 2.5 (4) |
N3—Eu1—O6—N2 | 74.22 (15) | C6—C3—C2—C1 | −176.3 (2) |
N3i—Eu1—O6—N2 | 154.21 (16) | C1—N3—C5—C4 | 1.0 (4) |
N2i—Eu1—O6—N2 | 158.00 (15) | Eu1—N3—C5—C4 | −162.3 (2) |
N1i—Eu1—O6—N2 | −99.67 (15) | C3—C4—C5—N3 | 1.4 (4) |
Eu1—O4—N2—O5 | 177.7 (2) | C5—N3—C1—C2 | −1.8 (4) |
Eu1—O4—N2—O6 | −1.0 (2) | Eu1—N3—C1—C2 | 162.2 (2) |
Eu1—O6—N2—O5 | −177.7 (2) | C3—C2—C1—N3 | 0.0 (4) |
Eu1—O6—N2—O4 | 1.1 (2) | C4—C3—C6—C10 | 34.9 (4) |
Eu1—O3—N1—O2 | −176.7 (2) | C2—C3—C6—C10 | −146.3 (3) |
Eu1—O3—N1—O1 | 3.1 (2) | C4—C3—C6—C7 | −144.6 (2) |
O2—N1—O1—Eu1 | 176.8 (2) | C2—C3—C6—C7 | 34.2 (3) |
O3—N1—O1—Eu1 | −3.0 (2) | C10—C6—C7—C8 | 0.8 (4) |
O6i—Eu1—O1—N1 | −84.12 (15) | C3—C6—C7—C8 | −179.6 (2) |
O6—Eu1—O1—N1 | 87.49 (17) | C7—C6—C10—C9 | −1.6 (4) |
O3—Eu1—O1—N1 | 1.81 (13) | C3—C6—C10—C9 | 178.9 (3) |
O3i—Eu1—O1—N1 | 156.02 (14) | C9—N4—C8—C7 | −0.3 (4) |
O4i—Eu1—O1—N1 | −137.91 (16) | C6—C7—C8—N4 | 0.1 (4) |
O4—Eu1—O1—N1 | 48.72 (15) | C8—N4—C9—C10 | −0.4 (5) |
O1i—Eu1—O1—N1 | 109.05 (16) | C6—C10—C9—N4 | 1.4 (5) |
Symmetry code: (i) −x, y, −z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N4—H11···N4ii | 0.89 (6) | 1.80 (6) | 2.682 (4) | 169 (6) |
Symmetry code: (ii) −x+1/2, −y+5/2, −z. |
Experimental details
Crystal data | |
Chemical formula | [Eu(NO3)4(C10H9N2)(C10H8N2)] |
Mr | 713.38 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 293 |
a, b, c (Å) | 20.136 (5), 7.8079 (14), 18.310 (3) |
β (°) | 118.834 (2) |
V (Å3) | 2521.8 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.57 |
Crystal size (mm) | 0.28 × 0.26 × 0.21 |
Data collection | |
Diffractometer | Bruker APEXII area-detector |
Absorption correction | Multi-scan (SADABS; Bruker, 2004) |
Tmin, Tmax | 0.533, 0.619 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7437, 2211, 2153 |
Rint | 0.051 |
(sin θ/λ)max (Å−1) | 0.600 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.018, 0.049, 1.02 |
No. of reflections | 2211 |
No. of parameters | 191 |
No. of restraints | 1 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.50, −0.56 |
Computer programs: SMART (Bruker, 2000), SMART, SAINT (Bruker, 2000), SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), SHELXL97.
Eu1—O6i | 2.4620 (18) | Eu1—N3 | 2.626 (2) |
Eu1—O3 | 2.4900 (19) | Eu1—N2i | 2.917 (2) |
Eu1—O4i | 2.5159 (18) | Eu1—N1i | 2.960 (2) |
Eu1—O1i | 2.563 (2) |
Symmetry code: (i) −x, y, −z+1/2. |
Rare earth complexes with luminescent properties feature long emission life but narrow emission bands. Complexes of different rare earth metals yield each of the three basic colors (Eu3+ for red, Tb3+ for green and Eu2+ for blue) and represent potential candidates for the preparation of new generational display and other luminescent instruments (Shaheen et al., 1999; Adachi et al.,2000). Past research shows it is important to select ligands which can match the central metal ions in energy and thus lead to 'antenna effect' (Sabbatini et al.,1993). Complexes of EuIII ion with 4,4'-bipyridine or its dioxide derivative as a bidentate ligand have been reported (Cotton et al.,2003), but to our knowledge, complexes of EuIII with 4,4'-bipyridyl as monodentate ligand have not been reported. In this paper we report the crystal structure of the title complex. As shown in Fig. 1, in this complex every EuIII ion is ten coordinate defined by two N atoms from two different monodentate 4,4'-bipyridine molecules and eight O atoms from four different bidentate nitrate anions. The Eu—N bond length is 2.626 (2) Å. The Eu—O bond lengths range from 2.4620 (17) to 2.5160 (17) Å. The C2 symmetry element existing in the crystal structure goes through the EuIIIions. One hydrogen ion is distributed between the two non-coordinated N atoms of the 4,4'-bipyridine ligands in 50% occupation ratio and takes part in forming an N—H···N strong intermolecular hydrogen bond to give a zigzag array. As depicted in Fig. 2, the zigzag strings are found to extend by forming strong hydrogen bonds described above along the a axis, in the packing structure of the crystal. Weak hydrogen bonds between nitrate O atoms and H atoms of pyridine rings connect different strings in adjacent molecules to form a three-dimensional network.