metal-organic compounds
Bis[2-(benzimidazol-2-ylsulfanyl)acetato]bis(2,2′-bipyridine)cadmium(II)
aSchool of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China
*Correspondence e-mail: cep02chl@yahoo.com.cn
In the structure of the title compound, [Cd(C9H7N2O2S)2(C10H8N2)2], the complex molecules are located on a crystallographic twofold rotation axis and the CdII ion is octahedrally coordinated by two chelating 2,2′-bipyridine ligands and two O atoms from the carboxylate groups of two 2-(benzimidazol-2-ylsulfanyl)acetate ligands. The two carboxylate ligands adopt a cis configuration with respect to each other. Within each of these ligands, the imidazole fragments are bent back in a loop towards the acetyl groups, forming intramolecular N—H⋯O hydrogen bonds, which help to stablilize the mononuclear complex. Adjacent molecules are further linked by weak C—H⋯O hydrogen bonds, resulting in a chain along the c axis.
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2000); cell SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536809039592/zl2228sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809039592/zl2228Isup2.hkl
A mixture of H2bia (0.0208 g, 0.1 mmol), 2,2'-bipy (0.0156 g, 0.1 mmol), Cd(NO3)2.6H2O (0.0345 g, 0.1 mmol) and H2O (8 ml) was heated in a 15-ml Teflon-lined autoclave at 363 K for 5 days, followed by slow cooling (5 K h-1) to room temperature. The resulting mixture was washed with water, and colorless block crystals were collected and dried in air [yield 91% (76.3 mg) based on Cd(II)].
The H atom bonded to the N atom was located in a difference map and was freely refined without use of restraints. All other H atoms were positioned geometrically and refined using a riding model with C—H = 0.93–0.97 Å and with Uiso(H) = 1.2 Ueq(C).
Recently, the photophysical properties of coordination compounds of d10 monovalent ions of the coinage metals have attracted considerable attention. Meanwhile, benzimidazole compounds and thioether carboxylates have been widely used to construct many interesting coordination compounds. However, such compounds formed by bifunctional ligands with both benzimidazole and thioether carboxylate groups have only been rarely reported (Cheng et al. 2009, Matthews et al. 1998). Herein, we present the synthesis and structural characterization of a new coordination compound of a d10 mononuclear complex Cd(Hbia)2(2,2'-bipy)2 (H2bia = 2-(1H-benzo[d]imidazol-2-ylthio)acetic acid; 2,2'-bipy = 2,2'-bipyridine) with the bifunctional ligand H2bia.
In the structure of the title compound the complex is located on a crystallographic two fold rotation axis with one CdII cation, one Hbia and one chelating 2,2'-bipy ligand in the
The CdII ion displays a distorted octahedral geometry, being surrounded by two chelating 2,2'-bipy ligands with Cd—N coordinating distances of 2.342 (2) and 2.378 (2) Å and two oxygen atoms coming from the carboxylates of two Hbia ligands, respectively, with the distance involving O atoms and Cd being 2.275 (2) Å. The angles around Cd are in the range of 69.50 (8)–158.51 (8) °. Meanwhile, the two carboxylate ligands are related by a two fold rotation axis and adopt a cis- configuration with respect to each other. Within each of these ligands the imidazole fragments are bent back in a loop towards the acetyl groups to form intramolecular N—H···O hydrogen bonds which help to stablilize the mononuclear complex (table 1). The N···O distance between N2 of the imidazole and the coordinated O atom O2 is 2.708 (3) Å. Adjacent molecules are further linked together by C—H···O hydrogen bonding between the uncoordinated oxygen atoms and the carbon atoms of 2,2'-bipyridine (C11···O1ii 3.180 (4) Å. symmetry code: ii, -x, 1-y, 1-z), resulting in a one-dimensional hydrogen bonded chain.For related structures, see: Matthews et al. (1998); Cheng et al. (2009).
Data collection: SMART (Bruker, 2000); cell
SAINT (Bruker, 2000); data reduction: SAINT (Bruker, 2000); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).[Cd(C9H7N2O2S)2(C10H8N2)2] | F(000) = 1704 |
Mr = 839.25 | Dx = 1.580 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 783 reflections |
a = 26.733 (2) Å | θ = 2.4–28.0° |
b = 9.3043 (8) Å | µ = 0.79 mm−1 |
c = 16.4220 (14) Å | T = 295 K |
β = 120.254 (1)° | Block, colorless |
V = 3528.3 (5) Å3 | 0.20 × 0.18 × 0.12 mm |
Z = 4 |
Bruker SMART CCD diffractometer | 3460 independent reflections |
Radiation source: fine-focus sealed tube | 2946 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.028 |
φ and ω scans | θmax = 26.0°, θmin = 1.8° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2000) | h = −32→30 |
Tmin = 0.858, Tmax = 0.911 | k = −11→11 |
9308 measured reflections | l = −20→19 |
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)] = 0.030 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.069 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0305P)2 + 1.2632P] where P = (Fo2 + 2Fc2)/3 |
3460 reflections | (Δ/σ)max < 0.001 |
244 parameters | Δρmax = 0.33 e Å−3 |
0 restraints | Δρmin = −0.47 e Å−3 |
[Cd(C9H7N2O2S)2(C10H8N2)2] | V = 3528.3 (5) Å3 |
Mr = 839.25 | Z = 4 |
Monoclinic, C2/c | Mo Kα radiation |
a = 26.733 (2) Å | µ = 0.79 mm−1 |
b = 9.3043 (8) Å | T = 295 K |
c = 16.4220 (14) Å | 0.20 × 0.18 × 0.12 mm |
β = 120.254 (1)° |
Bruker SMART CCD diffractometer | 3460 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2000) | 2946 reflections with I > 2σ(I) |
Tmin = 0.858, Tmax = 0.911 | Rint = 0.028 |
9308 measured reflections |
R[F2 > 2σ(F2)] = 0.030 | 0 restraints |
wR(F2) = 0.069 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | Δρmax = 0.33 e Å−3 |
3460 reflections | Δρmin = −0.47 e Å−3 |
244 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 | ||
Cd1 | 0.0000 | 0.27478 (3) | 0.2500 | 0.03543 (10) | |
S1 | 0.15271 (3) | 0.05110 (8) | 0.52528 (4) | 0.04872 (19) | |
C1 | 0.03416 (10) | 0.1120 (3) | 0.43699 (17) | 0.0373 (6) | |
C2 | 0.08216 (10) | 0.0184 (3) | 0.51125 (16) | 0.0415 (6) | |
H2A | 0.0721 | −0.0817 | 0.4945 | 0.050* | |
H2B | 0.0843 | 0.0346 | 0.5713 | 0.050* | |
C3 | 0.15201 (10) | −0.0542 (3) | 0.43638 (16) | 0.0388 (6) | |
C4 | 0.17937 (11) | −0.1829 (3) | 0.35876 (17) | 0.0413 (6) | |
C5 | 0.20952 (13) | −0.2670 (3) | 0.3279 (2) | 0.0540 (7) | |
H5A | 0.2493 | −0.2809 | 0.3653 | 0.065* | |
C6 | 0.17850 (13) | −0.3294 (3) | 0.2399 (2) | 0.0567 (7) | |
H6A | 0.1979 | −0.3860 | 0.2179 | 0.068* | |
C7 | 0.11932 (13) | −0.3099 (3) | 0.1835 (2) | 0.0561 (8) | |
H7A | 0.1000 | −0.3523 | 0.1242 | 0.067* | |
C8 | 0.08838 (13) | −0.2290 (3) | 0.2134 (2) | 0.0524 (7) | |
H8A | 0.0486 | −0.2163 | 0.1759 | 0.063* | |
C9 | 0.11938 (10) | −0.1676 (3) | 0.30194 (16) | 0.0385 (6) | |
C10 | 0.03449 (11) | 0.5176 (3) | 0.4126 (2) | 0.0494 (7) | |
H10A | −0.0049 | 0.5104 | 0.3915 | 0.059* | |
C11 | 0.06748 (12) | 0.6067 (3) | 0.4870 (2) | 0.0539 (7) | |
H11A | 0.0511 | 0.6576 | 0.5166 | 0.065* | |
C12 | 0.12519 (12) | 0.6190 (3) | 0.5169 (2) | 0.0526 (7) | |
H12A | 0.1485 | 0.6799 | 0.5667 | 0.063* | |
C13 | 0.14864 (11) | 0.5405 (3) | 0.47287 (18) | 0.0456 (6) | |
H13A | 0.1878 | 0.5479 | 0.4924 | 0.055* | |
C14 | 0.11277 (9) | 0.4506 (2) | 0.39904 (16) | 0.0336 (5) | |
C15 | 0.13512 (9) | 0.3589 (3) | 0.35035 (16) | 0.0339 (5) | |
C16 | 0.19346 (11) | 0.3488 (3) | 0.3800 (2) | 0.0542 (7) | |
H16A | 0.2203 | 0.4034 | 0.4307 | 0.065* | |
C17 | 0.21161 (12) | 0.2577 (3) | 0.3340 (2) | 0.0634 (9) | |
H17A | 0.2508 | 0.2496 | 0.3537 | 0.076* | |
C18 | 0.17124 (11) | 0.1788 (3) | 0.2589 (2) | 0.0525 (7) | |
H18A | 0.1824 | 0.1166 | 0.2266 | 0.063* | |
C19 | 0.11432 (11) | 0.1940 (3) | 0.23272 (18) | 0.0454 (7) | |
H19A | 0.0869 | 0.1410 | 0.1817 | 0.055* | |
N1 | 0.19912 (8) | −0.1097 (2) | 0.44392 (15) | 0.0478 (5) | |
N2 | 0.10299 (9) | −0.0851 (2) | 0.35415 (14) | 0.0410 (5) | |
N3 | 0.05612 (8) | 0.4404 (2) | 0.36884 (14) | 0.0390 (5) | |
N4 | 0.09607 (8) | 0.2814 (2) | 0.27686 (14) | 0.0360 (5) | |
O1 | 0.01181 (8) | 0.2029 (2) | 0.46217 (13) | 0.0559 (5) | |
O2 | 0.02068 (7) | 0.08785 (18) | 0.35135 (11) | 0.0422 (4) | |
H2C | 0.0731 (11) | −0.046 (3) | 0.3391 (17) | 0.040 (7)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cd1 | 0.02273 (14) | 0.04258 (17) | 0.03763 (15) | 0.000 | 0.01272 (11) | 0.000 |
S1 | 0.0323 (3) | 0.0634 (5) | 0.0415 (4) | 0.0011 (3) | 0.0120 (3) | −0.0134 (3) |
C1 | 0.0281 (12) | 0.0453 (15) | 0.0395 (14) | 0.0012 (11) | 0.0178 (11) | 0.0034 (12) |
C2 | 0.0437 (14) | 0.0473 (16) | 0.0351 (13) | 0.0069 (12) | 0.0211 (12) | 0.0061 (11) |
C3 | 0.0293 (13) | 0.0463 (15) | 0.0354 (13) | 0.0004 (11) | 0.0123 (11) | −0.0007 (11) |
C4 | 0.0352 (13) | 0.0485 (16) | 0.0412 (14) | 0.0000 (11) | 0.0199 (12) | 0.0005 (12) |
C5 | 0.0413 (16) | 0.067 (2) | 0.0592 (18) | 0.0054 (13) | 0.0293 (15) | −0.0053 (15) |
C6 | 0.0614 (19) | 0.0594 (19) | 0.0638 (19) | 0.0036 (15) | 0.0424 (17) | −0.0084 (16) |
C7 | 0.064 (2) | 0.0568 (19) | 0.0482 (17) | −0.0032 (15) | 0.0289 (15) | −0.0110 (14) |
C8 | 0.0430 (16) | 0.0599 (18) | 0.0452 (16) | 0.0030 (13) | 0.0154 (13) | −0.0044 (14) |
C9 | 0.0357 (13) | 0.0404 (14) | 0.0376 (13) | 0.0031 (11) | 0.0170 (11) | 0.0038 (11) |
C10 | 0.0418 (15) | 0.0446 (16) | 0.0701 (18) | 0.0026 (12) | 0.0344 (14) | −0.0066 (14) |
C11 | 0.0633 (19) | 0.0424 (16) | 0.0722 (19) | 0.0020 (14) | 0.0462 (17) | −0.0104 (15) |
C12 | 0.0540 (17) | 0.0482 (17) | 0.0573 (17) | −0.0067 (13) | 0.0293 (15) | −0.0161 (14) |
C13 | 0.0363 (14) | 0.0483 (16) | 0.0512 (15) | −0.0059 (12) | 0.0213 (12) | −0.0138 (13) |
C14 | 0.0288 (12) | 0.0340 (13) | 0.0379 (13) | 0.0002 (10) | 0.0167 (11) | 0.0002 (10) |
C15 | 0.0275 (12) | 0.0379 (14) | 0.0362 (13) | −0.0033 (10) | 0.0160 (10) | −0.0032 (11) |
C16 | 0.0296 (13) | 0.070 (2) | 0.0594 (17) | −0.0091 (13) | 0.0196 (13) | −0.0281 (15) |
C17 | 0.0293 (14) | 0.088 (2) | 0.073 (2) | −0.0054 (14) | 0.0259 (15) | −0.0318 (18) |
C18 | 0.0393 (15) | 0.0666 (19) | 0.0589 (17) | −0.0006 (13) | 0.0302 (14) | −0.0177 (15) |
C19 | 0.0373 (14) | 0.0567 (18) | 0.0443 (15) | −0.0087 (12) | 0.0220 (12) | −0.0163 (13) |
N1 | 0.0295 (11) | 0.0618 (15) | 0.0459 (13) | 0.0042 (10) | 0.0144 (10) | −0.0054 (11) |
N2 | 0.0281 (11) | 0.0496 (14) | 0.0393 (12) | 0.0059 (10) | 0.0126 (10) | −0.0043 (10) |
N3 | 0.0297 (11) | 0.0404 (12) | 0.0491 (12) | 0.0008 (9) | 0.0215 (10) | −0.0055 (10) |
N4 | 0.0267 (10) | 0.0443 (12) | 0.0366 (11) | −0.0027 (9) | 0.0156 (9) | −0.0065 (9) |
O1 | 0.0470 (11) | 0.0704 (14) | 0.0491 (11) | 0.0212 (10) | 0.0234 (9) | −0.0027 (10) |
O2 | 0.0393 (9) | 0.0521 (11) | 0.0332 (9) | 0.0121 (8) | 0.0168 (8) | 0.0054 (8) |
Cd1—O2i | 2.2746 (16) | C8—H8A | 0.9300 |
Cd1—O2 | 2.2746 (16) | C9—N2 | 1.376 (3) |
Cd1—N3 | 2.342 (2) | C10—N3 | 1.336 (3) |
Cd1—N3i | 2.3417 (19) | C10—C11 | 1.369 (4) |
Cd1—N4i | 2.3775 (19) | C10—H10A | 0.9300 |
Cd1—N4 | 2.3775 (19) | C11—C12 | 1.368 (4) |
S1—C3 | 1.750 (2) | C11—H11A | 0.9300 |
S1—C2 | 1.807 (2) | C12—C13 | 1.381 (3) |
C1—O1 | 1.221 (3) | C12—H12A | 0.9300 |
C1—O2 | 1.284 (3) | C13—C14 | 1.385 (3) |
C1—C2 | 1.521 (3) | C13—H13A | 0.9300 |
C2—H2A | 0.9700 | C14—N3 | 1.338 (3) |
C2—H2B | 0.9700 | C14—C15 | 1.485 (3) |
C3—N1 | 1.308 (3) | C15—N4 | 1.340 (3) |
C3—N2 | 1.357 (3) | C15—C16 | 1.383 (3) |
C4—C5 | 1.389 (4) | C16—C17 | 1.375 (4) |
C4—N1 | 1.398 (3) | C16—H16A | 0.9300 |
C4—C9 | 1.398 (3) | C17—C18 | 1.373 (4) |
C5—C6 | 1.381 (4) | C17—H17A | 0.9300 |
C5—H5A | 0.9300 | C18—C19 | 1.364 (3) |
C6—C7 | 1.385 (4) | C18—H18A | 0.9300 |
C6—H6A | 0.9300 | C19—N4 | 1.335 (3) |
C7—C8 | 1.378 (4) | C19—H19A | 0.9300 |
C7—H7A | 0.9300 | N2—H2C | 0.80 (2) |
C8—C9 | 1.383 (4) | ||
O2i—Cd1—O2 | 80.25 (8) | N2—C9—C4 | 105.0 (2) |
O2i—Cd1—N3 | 158.50 (6) | C8—C9—C4 | 122.5 (2) |
O2—Cd1—N3 | 94.35 (7) | N3—C10—C11 | 123.2 (2) |
O2i—Cd1—N3i | 94.35 (7) | N3—C10—H10A | 118.4 |
O2—Cd1—N3i | 158.50 (6) | C11—C10—H10A | 118.4 |
N3—Cd1—N3i | 97.71 (10) | C12—C11—C10 | 118.3 (2) |
O2i—Cd1—N4i | 92.44 (6) | C12—C11—H11A | 120.9 |
O2—Cd1—N4i | 89.84 (6) | C10—C11—H11A | 120.9 |
N3—Cd1—N4i | 108.43 (7) | C11—C12—C13 | 119.7 (3) |
N3i—Cd1—N4i | 69.49 (6) | C11—C12—H12A | 120.1 |
O2i—Cd1—N4 | 89.84 (6) | C13—C12—H12A | 120.1 |
O2—Cd1—N4 | 92.44 (6) | C12—C13—C14 | 118.8 (2) |
N3—Cd1—N4 | 69.49 (6) | C12—C13—H13A | 120.6 |
N3i—Cd1—N4 | 108.43 (7) | C14—C13—H13A | 120.6 |
N4i—Cd1—N4 | 177.01 (10) | N3—C14—C13 | 121.5 (2) |
C3—S1—C2 | 103.15 (12) | N3—C14—C15 | 116.5 (2) |
O1—C1—O2 | 125.2 (2) | C13—C14—C15 | 122.0 (2) |
O1—C1—C2 | 118.9 (2) | N4—C15—C16 | 120.6 (2) |
O2—C1—C2 | 115.8 (2) | N4—C15—C14 | 116.84 (19) |
C1—C2—S1 | 114.25 (17) | C16—C15—C14 | 122.5 (2) |
C1—C2—H2A | 108.7 | C17—C16—C15 | 119.7 (2) |
S1—C2—H2A | 108.7 | C17—C16—H16A | 120.1 |
C1—C2—H2B | 108.7 | C15—C16—H16A | 120.1 |
S1—C2—H2B | 108.7 | C18—C17—C16 | 119.2 (3) |
H2A—C2—H2B | 107.6 | C18—C17—H17A | 120.4 |
N1—C3—N2 | 114.3 (2) | C16—C17—H17A | 120.4 |
N1—C3—S1 | 122.47 (18) | C19—C18—C17 | 118.3 (2) |
N2—C3—S1 | 123.23 (18) | C19—C18—H18A | 120.8 |
C5—C4—N1 | 130.0 (2) | C17—C18—H18A | 120.8 |
C5—C4—C9 | 119.7 (2) | N4—C19—C18 | 123.2 (2) |
N1—C4—C9 | 110.2 (2) | N4—C19—H19A | 118.4 |
C6—C5—C4 | 117.8 (3) | C18—C19—H19A | 118.4 |
C6—C5—H5A | 121.1 | C3—N1—C4 | 103.73 (19) |
C4—C5—H5A | 121.1 | C3—N2—C9 | 106.7 (2) |
C5—C6—C7 | 121.7 (3) | C3—N2—H2C | 121.9 (18) |
C5—C6—H6A | 119.1 | C9—N2—H2C | 130.3 (18) |
C7—C6—H6A | 119.1 | C10—N3—C14 | 118.6 (2) |
C8—C7—C6 | 121.5 (3) | C10—N3—Cd1 | 122.20 (16) |
C8—C7—H7A | 119.3 | C14—N3—Cd1 | 119.05 (15) |
C6—C7—H7A | 119.3 | C19—N4—C15 | 119.0 (2) |
C7—C8—C9 | 116.8 (3) | C19—N4—Cd1 | 122.67 (16) |
C7—C8—H8A | 121.6 | C15—N4—Cd1 | 117.36 (14) |
C9—C8—H8A | 121.6 | C1—O2—Cd1 | 119.90 (16) |
N2—C9—C8 | 132.4 (2) |
Symmetry code: (i) −x, y, −z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2C···O2 | 0.80 (2) | 1.96 (2) | 2.708 (3) | 156 (2) |
C11—H11A···O1ii | 0.93 | 2.29 | 3.179 (3) | 161 |
Symmetry code: (ii) −x, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | [Cd(C9H7N2O2S)2(C10H8N2)2] |
Mr | 839.25 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 295 |
a, b, c (Å) | 26.733 (2), 9.3043 (8), 16.4220 (14) |
β (°) | 120.254 (1) |
V (Å3) | 3528.3 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.79 |
Crystal size (mm) | 0.20 × 0.18 × 0.12 |
Data collection | |
Diffractometer | Bruker SMART CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2000) |
Tmin, Tmax | 0.858, 0.911 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9308, 3460, 2946 |
Rint | 0.028 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.030, 0.069, 1.05 |
No. of reflections | 3460 |
No. of parameters | 244 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.33, −0.47 |
Computer programs: SMART (Bruker, 2000), SAINT (Bruker, 2000), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2C···O2 | 0.80 (2) | 1.96 (2) | 2.708 (3) | 156 (2) |
C11—H11A···O1i | 0.93 | 2.29 | 3.179 (3) | 160.8 |
Symmetry code: (i) −x, −y+1, −z+1. |
Acknowledgements
The authors thank the Program for Young Excellent Talents at Southeast University for financial support.
References
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Recently, the photophysical properties of coordination compounds of d10 monovalent ions of the coinage metals have attracted considerable attention. Meanwhile, benzimidazole compounds and thioether carboxylates have been widely used to construct many interesting coordination compounds. However, such compounds formed by bifunctional ligands with both benzimidazole and thioether carboxylate groups have only been rarely reported (Cheng et al. 2009, Matthews et al. 1998). Herein, we present the synthesis and structural characterization of a new coordination compound of a d10 mononuclear complex Cd(Hbia)2(2,2'-bipy)2 (H2bia = 2-(1H-benzo[d]imidazol-2-ylthio)acetic acid; 2,2'-bipy = 2,2'-bipyridine) with the bifunctional ligand H2bia.
In the structure of the title compound the complex is located on a crystallographic two fold rotation axis with one CdII cation, one Hbia and one chelating 2,2'-bipy ligand in the asymmetric unit. The CdII ion displays a distorted octahedral geometry, being surrounded by two chelating 2,2'-bipy ligands with Cd—N coordinating distances of 2.342 (2) and 2.378 (2) Å and two oxygen atoms coming from the carboxylates of two Hbia ligands, respectively, with the distance involving O atoms and Cd being 2.275 (2) Å. The angles around Cd are in the range of 69.50 (8)–158.51 (8) °. Meanwhile, the two carboxylate ligands are related by a two fold rotation axis and adopt a cis- configuration with respect to each other. Within each of these ligands the imidazole fragments are bent back in a loop towards the acetyl groups to form intramolecular N—H···O hydrogen bonds which help to stablilize the mononuclear complex (table 1). The N···O distance between N2 of the imidazole and the coordinated O atom O2 is 2.708 (3) Å. Adjacent molecules are further linked together by C—H···O hydrogen bonding between the uncoordinated oxygen atoms and the carbon atoms of 2,2'-bipyridine (C11···O1ii 3.180 (4) Å. symmetry code: ii, -x, 1-y, 1-z), resulting in a one-dimensional hydrogen bonded chain.