metal-organic compounds
Tetra-μ-benzoato-κ8O:O′-bis[(benzoic acid-κO)nickel(II)]
aKey Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, College of Chemistry and Bio-engineering, Yichun University, Yichun 336000, People's Republic of China
*Correspondence e-mail: djhycu_2006@yahoo.com.cn, yc_mgq@ycu.jx.cn
The title compound, [Ni2(C7H5O2)4(C7H6O2)2], is composed of two NiII ions, four bridging benzoate anions and two η1-benzoic acid molecules. The [Ni2(PhCOO)4] unit adopts a typical paddle-wheel conformation. The center between the two NiII atoms represents a crystallographic center of inversion. In addition, each NiII ion also coordinates to one O atom from a benzoic acid molecule. The crystal packing is realised by intermolecular hydrogen-bonding interactions and π–π stacking interactions, with a centroid–centroid distance of 3.921 (1) Å.
Related literature
For related benzoate complexes, see: Cotton et al. (2005, 1987, 1988); Bellitto et al. (1985); Figuerola et al. (2007); Gavrilenko et al. (2008); Shi et al. (2004); Zheng et al. (2004); Zhong et al. (2007, 2008).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2004); cell SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536809044766/im2153sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536809044766/im2153Isup2.hkl
All reagents are commercially available and were used without further purification. A mixture of Ni(NO3)2 × 4 H2O (0.5 mmol), sodium benzoate (1 mmol) and 2,2'-bipyridine (0.5 mmol) was dissolved in 10 ml water/methanol (1/1). After stirring for 30 min, the mixture was placed in a 20 ml Teflon-lined reactor and heated to 110 °C in an oven for 7 days. The resulting solution was filtered and the filtrate was allowed to stay at room temperature. Well shaped blue crystals suitable for X-rays diffraction were obtained after one week. Yield: 65.8% based on sodium benzoate.
All H atoms were placed geometrically and were refined using a riding model with C—H and O—H distances of 0.93 Å and 0.82 Å and Uiso(H) = 1.2Ueq(C), Uiso(H) = 1.5Ueq(O).
Benzoic acid is the most simple aromatic carboxyl compound with well-known antibacterial activity. Over the past years, many metal complexes based on benzoic acid or benzoate ligands have been synthesized and characterized (Figuerola et al., 2007; Gavrilenko et al., 2008; Shi et al., 2004; Zheng et al., 2004). We also reported the Co(II) and Cd(II) complexes with benzoate and 2-aminopyridine ligands (Zhong et al., 2007; Zhong et al., 2008). As a continuation of this work, we herein report the synthesis and
of a nickel (II) complex exhibiting benzoate as well as benzoic acid ligands.The title compound (I) is a typical paddle-wheel complex that have previously been observed (Bellitto et al., 1985; Cotton et al., 1987; Cotton et al., 1988). Two NiII ions are bridged by four benzoate anions ligand using a µ-COO- coordination mode. Each NiII also coordinates to one oxygen atom from one benzoic acid molecule in the axial position (Fig. 1). The center between the two nickel atoms represents a crystallographic center of inversion. The Ni—O bond lengths, ranging from 1.945 (1) Å to 2.193 (1) Å, are in the normal value range.The almost equivalent bond distances of O1—C8 and O2—C8 (1.260 (2) Å and 1.258 (2) Å) in one benzoate ligand and O3—C1 and O4—C1 (1.270 (2) Å and 1.255 (2) Å) in the other reflect the expected delocalization in the carboxylate unit. On the other hand bond distances of O5—C15 and O6—C15 (1.213 (2) Å and 1.317 (2) Å) in the axial benzoic acid ligands prove that it is not deprotonated and accordingly there is one single and one double bond. Albeit the short Ni···Ni distance of 2.6062 (4) Å there is no bonding interaction between both metal centers due to the d8
of Ni2+ leading to an overall bond order of zero (Cotton et al., 2005)The carboxyl group of the benzoic acid ligand (O6) acts as an intramolecular hydrogen bond donor site towards another oxygen atom of one of the bridging benzoate anions (O3). In addition, intermolecular contacts in terms of π–π stacking interactions with centroid centroid distances of 3.921 (1) Å are observed between the phenyl groups.
For related benzoate complexes, see: Cotton et al. (2005, 1987, 1988); Bellitto et al. (1985); Figuerola et al. (2007); Gavrilenko et al. (2008); Shi et al. (2004); Zheng et al. (2004); Zhong et al. (2007, 2008).
Data collection: SMART (Bruker, 2004); cell
SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).Fig. 1. The structure of (I), showing 30% probability displacement ellipsoids and the atom-labeling scheme. [Symmetry code: (i) -x+1, -y, -z+2.] |
[Ni2(C7H5O2)4(C7H6O2)2] | F(000) = 872 |
Mr = 846.10 | Dx = 1.460 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 7941 reflections |
a = 10.7685 (8) Å | θ = 2.3–28.0° |
b = 11.7173 (7) Å | µ = 1.04 mm−1 |
c = 15.258 (1) Å | T = 273 K |
β = 91.354 (3)° | Block, blue |
V = 1924.7 (2) Å3 | 0.28 × 0.26 × 0.20 mm |
Z = 2 |
Bruker SMART CCD area-detector diffractometer | 4639 independent reflections |
Radiation source: fine-focus sealed tube | 3789 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.022 |
φ and ω scans | θmax = 28.1°, θmin = 2.2° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2008) | h = −14→12 |
Tmin = 0.759, Tmax = 0.819 | k = −15→14 |
17534 measured reflections | l = −18→20 |
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)] = 0.027 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.055 | H-atom parameters constrained |
S = 0.99 | w = 1/[σ2(Fo2) + 1.1987P] where P = (Fo2 + 2Fc2)/3 |
4639 reflections | (Δ/σ)max = 0.002 |
254 parameters | Δρmax = 0.22 e Å−3 |
0 restraints | Δρmin = −0.29 e Å−3 |
[Ni2(C7H5O2)4(C7H6O2)2] | V = 1924.7 (2) Å3 |
Mr = 846.10 | Z = 2 |
Monoclinic, P21/n | Mo Kα radiation |
a = 10.7685 (8) Å | µ = 1.04 mm−1 |
b = 11.7173 (7) Å | T = 273 K |
c = 15.258 (1) Å | 0.28 × 0.26 × 0.20 mm |
β = 91.354 (3)° |
Bruker SMART CCD area-detector diffractometer | 4639 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2008) | 3789 reflections with I > 2σ(I) |
Tmin = 0.759, Tmax = 0.819 | Rint = 0.022 |
17534 measured reflections |
R[F2 > 2σ(F2)] = 0.027 | 0 restraints |
wR(F2) = 0.055 | H-atom parameters constrained |
S = 0.99 | Δρmax = 0.22 e Å−3 |
4639 reflections | Δρmin = −0.29 e Å−3 |
254 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 | ||
Ni1 | 0.517820 (18) | 0.106516 (17) | 0.979210 (13) | 0.03259 (6) | |
O1 | 0.42315 (11) | −0.11994 (11) | 0.89928 (7) | 0.0471 (3) | |
O2 | 0.45485 (12) | 0.06289 (11) | 0.86345 (8) | 0.0499 (3) | |
O3 | 0.31459 (11) | −0.05001 (10) | 1.05426 (8) | 0.0473 (3) | |
O4 | 0.34725 (11) | 0.13053 (10) | 1.01561 (8) | 0.0483 (3) | |
O5 | 0.56860 (12) | 0.28015 (11) | 0.94023 (9) | 0.0528 (3) | |
O6 | 0.75910 (14) | 0.25119 (13) | 0.89184 (13) | 0.0800 (5) | |
H6 | 0.7451 | 0.1858 | 0.9080 | 0.120* | |
C1 | 0.27981 (15) | 0.05301 (15) | 1.04542 (10) | 0.0397 (4) | |
C2 | 0.15133 (15) | 0.08413 (16) | 1.07061 (11) | 0.0428 (4) | |
C3 | 0.07758 (19) | 0.0110 (2) | 1.11745 (14) | 0.0656 (6) | |
H3 | 0.1080 | −0.0598 | 1.1353 | 0.079* | |
C4 | −0.0418 (2) | 0.0433 (2) | 1.13776 (17) | 0.0817 (7) | |
H4 | −0.0910 | −0.0053 | 1.1704 | 0.098* | |
C5 | −0.0880 (2) | 0.1463 (2) | 1.11020 (17) | 0.0768 (7) | |
H5 | −0.1690 | 0.1667 | 1.1230 | 0.092* | |
C6 | −0.0157 (2) | 0.2189 (2) | 1.06420 (18) | 0.0779 (7) | |
H6A | −0.0472 | 0.2889 | 1.0456 | 0.093* | |
C7 | 0.10426 (18) | 0.18862 (18) | 1.04522 (15) | 0.0623 (6) | |
H7 | 0.1540 | 0.2393 | 1.0149 | 0.075* | |
C8 | 0.41868 (15) | −0.03704 (15) | 0.84671 (11) | 0.0402 (4) | |
C9 | 0.36303 (15) | −0.05843 (16) | 0.75772 (11) | 0.0429 (4) | |
C10 | 0.34030 (19) | 0.03208 (18) | 0.70105 (12) | 0.0567 (5) | |
H10 | 0.3640 | 0.1056 | 0.7170 | 0.068* | |
C11 | 0.2822 (2) | 0.0125 (2) | 0.62069 (14) | 0.0708 (6) | |
H11 | 0.2670 | 0.0731 | 0.5826 | 0.085* | |
C12 | 0.2468 (2) | −0.0961 (2) | 0.59682 (14) | 0.0715 (6) | |
H12 | 0.2077 | −0.1087 | 0.5427 | 0.086* | |
C13 | 0.2689 (2) | −0.1858 (2) | 0.65259 (14) | 0.0710 (6) | |
H13 | 0.2442 | −0.2591 | 0.6365 | 0.085* | |
C14 | 0.32799 (19) | −0.16738 (18) | 0.73287 (12) | 0.0564 (5) | |
H14 | 0.3442 | −0.2286 | 0.7702 | 0.068* | |
C15 | 0.66085 (18) | 0.31531 (16) | 0.90494 (12) | 0.0464 (4) | |
C16 | 0.67474 (18) | 0.43389 (16) | 0.87387 (12) | 0.0470 (4) | |
C17 | 0.5774 (2) | 0.50892 (17) | 0.88474 (13) | 0.0563 (5) | |
H17 | 0.5048 | 0.4842 | 0.9105 | 0.068* | |
C18 | 0.5882 (2) | 0.62111 (19) | 0.85726 (14) | 0.0684 (6) | |
H18 | 0.5231 | 0.6720 | 0.8651 | 0.082* | |
C19 | 0.6951 (3) | 0.6569 (2) | 0.81847 (15) | 0.0758 (7) | |
H19 | 0.7021 | 0.7323 | 0.8000 | 0.091* | |
C20 | 0.7914 (3) | 0.5829 (2) | 0.80675 (17) | 0.0809 (7) | |
H20 | 0.8631 | 0.6077 | 0.7798 | 0.097* | |
C21 | 0.7825 (2) | 0.47092 (19) | 0.83488 (15) | 0.0670 (6) | |
H21 | 0.8484 | 0.4208 | 0.8277 | 0.080* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Ni1 | 0.03193 (10) | 0.03109 (10) | 0.03470 (10) | 0.00072 (9) | −0.00051 (7) | 0.00127 (9) |
O1 | 0.0553 (7) | 0.0457 (7) | 0.0400 (6) | −0.0009 (6) | −0.0056 (5) | −0.0001 (6) |
O2 | 0.0593 (8) | 0.0479 (7) | 0.0420 (7) | −0.0071 (6) | −0.0089 (6) | 0.0007 (6) |
O3 | 0.0406 (7) | 0.0409 (7) | 0.0607 (8) | 0.0068 (6) | 0.0076 (6) | 0.0041 (6) |
O4 | 0.0381 (6) | 0.0430 (7) | 0.0640 (8) | 0.0051 (6) | 0.0062 (6) | 0.0046 (6) |
O5 | 0.0531 (8) | 0.0408 (7) | 0.0648 (8) | 0.0010 (6) | 0.0111 (6) | 0.0076 (6) |
O6 | 0.0642 (10) | 0.0483 (9) | 0.1289 (15) | 0.0090 (8) | 0.0353 (9) | 0.0193 (9) |
C1 | 0.0377 (9) | 0.0440 (10) | 0.0373 (9) | 0.0044 (8) | −0.0017 (7) | −0.0025 (7) |
C2 | 0.0347 (9) | 0.0493 (11) | 0.0443 (9) | 0.0041 (8) | 0.0010 (7) | −0.0063 (8) |
C3 | 0.0504 (12) | 0.0710 (15) | 0.0759 (15) | 0.0086 (11) | 0.0157 (10) | 0.0131 (12) |
C4 | 0.0524 (14) | 0.094 (2) | 0.1000 (19) | 0.0019 (13) | 0.0287 (13) | 0.0100 (16) |
C5 | 0.0427 (12) | 0.0887 (19) | 0.0995 (19) | 0.0124 (12) | 0.0143 (12) | −0.0141 (15) |
C6 | 0.0511 (13) | 0.0690 (16) | 0.114 (2) | 0.0214 (12) | 0.0130 (13) | 0.0013 (14) |
C7 | 0.0466 (11) | 0.0550 (13) | 0.0860 (15) | 0.0113 (10) | 0.0142 (10) | 0.0041 (11) |
C8 | 0.0348 (9) | 0.0466 (10) | 0.0393 (9) | 0.0026 (8) | 0.0013 (7) | −0.0023 (8) |
C9 | 0.0380 (9) | 0.0526 (11) | 0.0381 (9) | −0.0003 (8) | −0.0004 (7) | −0.0031 (8) |
C10 | 0.0632 (13) | 0.0571 (13) | 0.0493 (11) | −0.0062 (10) | −0.0107 (9) | 0.0030 (9) |
C11 | 0.0832 (16) | 0.0773 (16) | 0.0508 (12) | 0.0016 (13) | −0.0206 (11) | 0.0083 (11) |
C12 | 0.0783 (16) | 0.0869 (18) | 0.0483 (12) | 0.0023 (14) | −0.0214 (11) | −0.0103 (12) |
C13 | 0.0864 (17) | 0.0681 (15) | 0.0578 (13) | −0.0087 (13) | −0.0151 (12) | −0.0166 (11) |
C14 | 0.0677 (13) | 0.0549 (12) | 0.0463 (10) | −0.0010 (10) | −0.0069 (9) | −0.0046 (9) |
C15 | 0.0518 (11) | 0.0414 (10) | 0.0460 (10) | 0.0004 (9) | 0.0013 (8) | −0.0009 (8) |
C16 | 0.0575 (11) | 0.0395 (10) | 0.0441 (10) | −0.0042 (9) | −0.0002 (8) | −0.0006 (8) |
C17 | 0.0650 (13) | 0.0499 (12) | 0.0539 (12) | 0.0032 (10) | −0.0006 (10) | 0.0029 (9) |
C18 | 0.0915 (17) | 0.0472 (13) | 0.0662 (14) | 0.0111 (12) | −0.0076 (12) | 0.0016 (10) |
C19 | 0.112 (2) | 0.0447 (13) | 0.0706 (15) | −0.0124 (14) | −0.0019 (14) | 0.0078 (11) |
C20 | 0.0904 (19) | 0.0598 (16) | 0.0932 (18) | −0.0205 (14) | 0.0171 (15) | 0.0114 (13) |
C21 | 0.0697 (15) | 0.0512 (13) | 0.0808 (15) | −0.0051 (11) | 0.0141 (12) | 0.0040 (11) |
Ni1—O2 | 1.9452 (12) | C7—H7 | 0.9300 |
Ni1—O4 | 1.9519 (12) | C8—C9 | 1.492 (2) |
Ni1—O1i | 1.9520 (11) | C9—C14 | 1.382 (3) |
Ni1—O3i | 1.9999 (12) | C9—C10 | 1.386 (3) |
Ni1—O5 | 2.1926 (13) | C10—C11 | 1.382 (3) |
Ni1—Ni1i | 2.6062 (4) | C10—H10 | 0.9300 |
O1—C8 | 1.260 (2) | C11—C12 | 1.375 (3) |
O1—Ni1i | 1.9520 (11) | C11—H11 | 0.9300 |
O2—C8 | 1.258 (2) | C12—C13 | 1.370 (3) |
O3—C1 | 1.270 (2) | C12—H12 | 0.9300 |
O3—Ni1i | 1.9999 (12) | C13—C14 | 1.384 (3) |
O4—C1 | 1.255 (2) | C13—H13 | 0.9300 |
O5—C15 | 1.213 (2) | C14—H14 | 0.9300 |
O6—C15 | 1.317 (2) | C15—C16 | 1.477 (3) |
O6—H6 | 0.8200 | C16—C17 | 1.381 (3) |
C1—C2 | 1.490 (2) | C16—C21 | 1.386 (3) |
C2—C3 | 1.379 (3) | C17—C18 | 1.385 (3) |
C2—C7 | 1.377 (3) | C17—H17 | 0.9300 |
C3—C4 | 1.382 (3) | C18—C19 | 1.373 (3) |
C3—H3 | 0.9300 | C18—H18 | 0.9300 |
C4—C5 | 1.368 (3) | C19—C20 | 1.367 (3) |
C4—H4 | 0.9300 | C19—H19 | 0.9300 |
C5—C6 | 1.359 (3) | C20—C21 | 1.384 (3) |
C5—H5 | 0.9300 | C20—H20 | 0.9300 |
C6—C7 | 1.377 (3) | C21—H21 | 0.9300 |
C6—H6A | 0.9300 | ||
O2—Ni1—O4 | 89.20 (5) | O2—C8—O1 | 125.54 (16) |
O2—Ni1—O1i | 169.19 (5) | O2—C8—C9 | 117.17 (16) |
O4—Ni1—O1i | 90.32 (5) | O1—C8—C9 | 117.27 (16) |
O2—Ni1—O3i | 88.77 (5) | C14—C9—C10 | 119.50 (17) |
O4—Ni1—O3i | 168.91 (5) | C14—C9—C8 | 120.40 (17) |
O1i—Ni1—O3i | 89.64 (5) | C10—C9—C8 | 120.01 (17) |
O2—Ni1—O5 | 94.67 (5) | C11—C10—C9 | 119.7 (2) |
O4—Ni1—O5 | 100.71 (5) | C11—C10—H10 | 120.1 |
O1i—Ni1—O5 | 96.03 (5) | C9—C10—H10 | 120.1 |
O3i—Ni1—O5 | 90.32 (5) | C12—C11—C10 | 120.4 (2) |
O2—Ni1—Ni1i | 85.36 (4) | C12—C11—H11 | 119.8 |
O4—Ni1—Ni1i | 85.63 (4) | C10—C11—H11 | 119.8 |
O1i—Ni1—Ni1i | 83.83 (4) | C13—C12—C11 | 120.16 (19) |
O3i—Ni1—Ni1i | 83.34 (4) | C13—C12—H12 | 119.9 |
O5—Ni1—Ni1i | 173.66 (4) | C11—C12—H12 | 119.9 |
C8—O1—Ni1i | 123.31 (11) | C12—C13—C14 | 120.0 (2) |
C8—O2—Ni1 | 121.90 (11) | C12—C13—H13 | 120.0 |
C1—O3—Ni1i | 123.58 (11) | C14—C13—H13 | 120.0 |
C1—O4—Ni1 | 123.73 (11) | C13—C14—C9 | 120.3 (2) |
C15—O5—Ni1 | 130.36 (12) | C13—C14—H14 | 119.9 |
C15—O6—H6 | 109.5 | C9—C14—H14 | 119.9 |
O4—C1—O3 | 123.69 (15) | O5—C15—O6 | 122.89 (17) |
O4—C1—C2 | 117.72 (15) | O5—C15—C16 | 123.51 (18) |
O3—C1—C2 | 118.58 (16) | O6—C15—C16 | 113.59 (17) |
C3—C2—C7 | 119.05 (17) | C17—C16—C21 | 119.83 (19) |
C3—C2—C1 | 122.08 (17) | C17—C16—C15 | 118.53 (18) |
C7—C2—C1 | 118.87 (17) | C21—C16—C15 | 121.64 (18) |
C2—C3—C4 | 119.7 (2) | C16—C17—C18 | 119.9 (2) |
C2—C3—H3 | 120.1 | C16—C17—H17 | 120.0 |
C4—C3—H3 | 120.1 | C18—C17—H17 | 120.0 |
C5—C4—C3 | 120.4 (2) | C19—C18—C17 | 119.8 (2) |
C5—C4—H4 | 119.8 | C19—C18—H18 | 120.1 |
C3—C4—H4 | 119.8 | C17—C18—H18 | 120.1 |
C6—C5—C4 | 120.1 (2) | C18—C19—C20 | 120.6 (2) |
C6—C5—H5 | 119.9 | C18—C19—H19 | 119.7 |
C4—C5—H5 | 119.9 | C20—C19—H19 | 119.7 |
C5—C6—C7 | 119.9 (2) | C19—C20—C21 | 120.2 (2) |
C5—C6—H6A | 120.0 | C19—C20—H20 | 119.9 |
C7—C6—H6A | 120.0 | C21—C20—H20 | 119.9 |
C6—C7—C2 | 120.7 (2) | C20—C21—C16 | 119.7 (2) |
C6—C7—H7 | 119.6 | C20—C21—H21 | 120.2 |
C2—C7—H7 | 119.6 | C16—C21—H21 | 120.2 |
Symmetry code: (i) −x+1, −y, −z+2. |
D—H···A | D—H | H···A | D···A | D—H···A |
O6—H6···O3i | 0.82 | 1.81 | 2.626 (2) | 170 |
Symmetry code: (i) −x+1, −y, −z+2. |
Experimental details
Crystal data | |
Chemical formula | [Ni2(C7H5O2)4(C7H6O2)2] |
Mr | 846.10 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 273 |
a, b, c (Å) | 10.7685 (8), 11.7173 (7), 15.258 (1) |
β (°) | 91.354 (3) |
V (Å3) | 1924.7 (2) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 1.04 |
Crystal size (mm) | 0.28 × 0.26 × 0.20 |
Data collection | |
Diffractometer | Bruker SMART CCD area-detector |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2008) |
Tmin, Tmax | 0.759, 0.819 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 17534, 4639, 3789 |
Rint | 0.022 |
(sin θ/λ)max (Å−1) | 0.662 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.027, 0.055, 0.99 |
No. of reflections | 4639 |
No. of parameters | 254 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.22, −0.29 |
Computer programs: SMART (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
O6—H6···O3i | 0.82 | 1.81 | 2.626 (2) | 169.6 |
Symmetry code: (i) −x+1, −y, −z+2. |
Acknowledgements
The authors thank the Youth Foundation of Jiangxi Provincial Office of Education (GJJ09605, GJJ09355) and the Natural Science Foundation of Jiangxi Province (2008GZH0063) for financial support.
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Benzoic acid is the most simple aromatic carboxyl compound with well-known antibacterial activity. Over the past years, many metal complexes based on benzoic acid or benzoate ligands have been synthesized and characterized (Figuerola et al., 2007; Gavrilenko et al., 2008; Shi et al., 2004; Zheng et al., 2004). We also reported the Co(II) and Cd(II) complexes with benzoate and 2-aminopyridine ligands (Zhong et al., 2007; Zhong et al., 2008). As a continuation of this work, we herein report the synthesis and crystal structure of a nickel (II) complex exhibiting benzoate as well as benzoic acid ligands.
The title compound (I) is a typical paddle-wheel complex that have previously been observed (Bellitto et al., 1985; Cotton et al., 1987; Cotton et al., 1988). Two NiII ions are bridged by four benzoate anions ligand using a µ-COO- coordination mode. Each NiII also coordinates to one oxygen atom from one benzoic acid molecule in the axial position (Fig. 1). The center between the two nickel atoms represents a crystallographic center of inversion. The Ni—O bond lengths, ranging from 1.945 (1) Å to 2.193 (1) Å, are in the normal value range.The almost equivalent bond distances of O1—C8 and O2—C8 (1.260 (2) Å and 1.258 (2) Å) in one benzoate ligand and O3—C1 and O4—C1 (1.270 (2) Å and 1.255 (2) Å) in the other reflect the expected delocalization in the carboxylate unit. On the other hand bond distances of O5—C15 and O6—C15 (1.213 (2) Å and 1.317 (2) Å) in the axial benzoic acid ligands prove that it is not deprotonated and accordingly there is one single and one double bond. Albeit the short Ni···Ni distance of 2.6062 (4) Å there is no bonding interaction between both metal centers due to the d8 electron configuration of Ni2+ leading to an overall bond order of zero (Cotton et al., 2005)
The carboxyl group of the benzoic acid ligand (O6) acts as an intramolecular hydrogen bond donor site towards another oxygen atom of one of the bridging benzoate anions (O3). In addition, intermolecular contacts in terms of π–π stacking interactions with centroid centroid distances of 3.921 (1) Å are observed between the phenyl groups.