Acta Cryst. (2009). E65, m211-m212 [ doi:10.1107/S1600536809001895 ]
![[mu]](/logos/entities/mu_rmgif.gif)
-5-chloro-2-nitrobenzoato)]In the title compound, [Cu2(C7H3ClNO4)4]n, the coordination geometry around each CuII ion is distorted square-pyramidal. The CuO5 coordination is formed by five O atoms from the carboxylate groups of five 5-chloro-2-nitrobenzoate ligands. This coordination leads to the formation of centrosymmetric binuclear units which are edge-shared, forming a linear chain along the a axis, with the CuII ions alternately separated by 2.5891 (4) and 3.1763 (4) Å. The chains are interconnected into a three-dimensional network by C-H
O interactions.
An ethanol solution (50 ml) of 5-chloro-2-nitrobenzoic acid (4.84 g, 0.024 mol) was added to a solution of copper(II) sulfate pentahydrate (3.00 g, 0.012 mol) in ethanol (50 ml) and the mixture was stirred and refluxed for 2 h. The resulting solution was filtered and left to cool down to room temperature. After a few days of slow evaporation, blue crystals suitable for X-ray analysis were collected.
All H atoms were positioned geometrically and refined using a riding model with C-H = 0.93 Å and Uiso(H) = 1.2Ueq(C).
Data collection: APEX2 (Bruker, 2005); cell refinement: SAINT (Bruker, 2005); data reduction: SAINT (Bruker, 2005); 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) and PLATON (Spek, 2003).
![[Figure 1]](./ci2748fig1thm.gif)
| Fig. 1. Part of the polymeric chain of the title compound, showing the coordination environment of the Cu atom and with displacement ellipsoids drawn at the 50% probability level. H-atoms are omitted for clarity. Symmetry codes: (A) -x, -y, 1-z; (B) x-1, y, z; (C) 1-x, -y, 1-z. |
![[Figure 2]](./ci2748fig2thm.gif)
| Fig. 2. The crystal packing of the title compound, viewed down the a axis. Hydrogen bonds are shown as dashed lines. |
| [Cu2(C7H3ClNO4)4] | Z = 1 |
| Mr = 929.30 | F(000) = 462 |
| Triclinic, P1 | Dx = 1.893 Mg m−3 |
| Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
| a = 5.0353 (1) Å | Cell parameters from 4198 reflections |
| b = 11.8001 (3) Å | θ = 2.4–33.5° |
| c = 13.8595 (3) Å | µ = 1.72 mm−1 |
| α = 84.539 (2)° | T = 100 K |
| β = 85.553 (1)° | Plate, blue |
| γ = 85.610 (2)° | 0.47 × 0.21 × 0.08 mm |
| V = 815.30 (3) Å3 |
| Bruker APEXII CCD area-detector diffractometer | 4656 independent reflections |
| Radiation source: fine-focus sealed tube | 3994 reflections with I > 2σ(I) |
| graphite | Rint = 0.034 |
| φ and ω scans | θmax = 30.0°, θmin = 1.5° |
| Absorption correction: multi-scan (SADABS; Bruker, 2005) | h = −7→7 |
| Tmin = 0.498, Tmax = 0.875 | k = −16→16 |
| 11613 measured reflections | l = −19→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)] = 0.035 | Hydrogen site location: inferred from neighbouring sites |
| wR(F2) = 0.116 | H-atom parameters constrained |
| S = 1.10 | w = 1/[σ2(Fo2) + (0.0656P)2 + 0.3146P] where P = (Fo2 + 2Fc2)/3 |
| 4656 reflections | (Δ/σ)max = 0.001 |
| 244 parameters | Δρmax = 0.72 e Å−3 |
| 0 restraints | Δρmin = −1.04 e Å−3 |
| [Cu2(C7H3ClNO4)4] | γ = 85.610 (2)° |
| Mr = 929.30 | V = 815.30 (3) Å3 |
| Triclinic, P1 | Z = 1 |
| a = 5.0353 (1) Å | Mo Kα radiation |
| b = 11.8001 (3) Å | µ = 1.72 mm−1 |
| c = 13.8595 (3) Å | T = 100 K |
| α = 84.539 (2)° | 0.47 × 0.21 × 0.08 mm |
| β = 85.553 (1)° |
| Bruker APEXII CCD area-detector diffractometer | 4656 independent reflections |
| Absorption correction: multi-scan (SADABS; Bruker, 2005) | 3994 reflections with I > 2σ(I) |
| Tmin = 0.498, Tmax = 0.875 | Rint = 0.034 |
| 11613 measured reflections | θmax = 30.0° |
| R[F2 > 2σ(F2)] = 0.035 | H-atom parameters constrained |
| wR(F2) = 0.116 | Δρmax = 0.72 e Å−3 |
| S = 1.10 | Δρmin = −1.04 e Å−3 |
| 4656 reflections | Absolute structure: ? |
| 244 parameters | Flack parameter: ? |
| 0 restraints | Rogers parameter: ? |
Experimental. The data was collected with the Oxford Cryosystem Cobra low-temperature attachment |
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 | ||
| Cu1 | 0.21339 (5) | 0.05196 (2) | 0.471444 (19) | 0.01008 (9) | |
| Cl1 | 0.39928 (16) | 0.36470 (6) | 0.09685 (5) | 0.02730 (16) | |
| Cl2 | −0.29870 (15) | −0.38843 (6) | 0.13820 (5) | 0.02494 (16) | |
| O1 | 0.6289 (3) | 0.09053 (14) | 0.45747 (12) | 0.0112 (3) | |
| O2 | 1.0009 (3) | 0.17993 (14) | 0.40983 (12) | 0.0130 (3) | |
| O3 | 0.6319 (4) | 0.29482 (16) | 0.56079 (13) | 0.0190 (4) | |
| O4 | 0.2829 (4) | 0.41394 (17) | 0.56834 (15) | 0.0242 (4) | |
| O5 | 0.2124 (3) | −0.02541 (15) | 0.35393 (12) | 0.0138 (3) | |
| O6 | −0.1564 (3) | −0.11767 (15) | 0.40442 (12) | 0.0141 (3) | |
| O7 | 0.1420 (4) | 0.10970 (17) | 0.17610 (15) | 0.0247 (4) | |
| O8 | 0.5268 (4) | 0.0237 (2) | 0.13998 (16) | 0.0283 (5) | |
| N1 | 0.4497 (4) | 0.35283 (18) | 0.52330 (16) | 0.0162 (4) | |
| N2 | 0.2865 (4) | 0.02437 (19) | 0.16027 (15) | 0.0172 (4) | |
| C1 | 0.4307 (5) | 0.3520 (2) | 0.41832 (17) | 0.0138 (4) | |
| C2 | 0.2609 (5) | 0.4338 (2) | 0.3721 (2) | 0.0191 (5) | |
| H2A | 0.1571 | 0.4864 | 0.4073 | 0.023* | |
| C3 | 0.2481 (5) | 0.4361 (2) | 0.2728 (2) | 0.0215 (5) | |
| H3A | 0.1339 | 0.4899 | 0.2403 | 0.026* | |
| C4 | 0.4063 (5) | 0.3577 (2) | 0.22185 (19) | 0.0191 (5) | |
| C5 | 0.5750 (5) | 0.2744 (2) | 0.26839 (18) | 0.0150 (4) | |
| H5A | 0.6780 | 0.2219 | 0.2329 | 0.018* | |
| C6 | 0.5877 (4) | 0.2705 (2) | 0.36849 (18) | 0.0128 (4) | |
| C7 | 0.7537 (4) | 0.1749 (2) | 0.41697 (16) | 0.0116 (4) | |
| C8 | 0.0272 (4) | −0.0881 (2) | 0.34205 (17) | 0.0125 (4) | |
| C9 | 0.0247 (5) | −0.1317 (2) | 0.24379 (17) | 0.0131 (4) | |
| C10 | 0.1569 (5) | −0.0832 (2) | 0.16019 (18) | 0.0156 (5) | |
| C11 | 0.1618 (5) | −0.1279 (2) | 0.07137 (19) | 0.0209 (5) | |
| H11A | 0.2577 | −0.0948 | 0.0173 | 0.025* | |
| C12 | 0.0212 (5) | −0.2231 (2) | 0.06434 (19) | 0.0217 (5) | |
| H12A | 0.0200 | −0.2545 | 0.0053 | 0.026* | |
| C13 | −0.1169 (5) | −0.2706 (2) | 0.14635 (19) | 0.0187 (5) | |
| C14 | −0.1152 (5) | −0.2281 (2) | 0.23593 (18) | 0.0168 (5) | |
| H14A | −0.2060 | −0.2632 | 0.2903 | 0.020* |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| Cu1 | 0.00866 (14) | 0.01013 (15) | 0.01168 (15) | −0.00058 (9) | −0.00121 (9) | −0.00174 (10) |
| Cl1 | 0.0418 (4) | 0.0235 (3) | 0.0178 (3) | −0.0067 (3) | −0.0126 (3) | 0.0037 (2) |
| Cl2 | 0.0375 (4) | 0.0189 (3) | 0.0210 (3) | −0.0106 (3) | −0.0089 (3) | −0.0029 (2) |
| O1 | 0.0094 (7) | 0.0094 (8) | 0.0142 (7) | 0.0000 (6) | −0.0016 (6) | 0.0014 (6) |
| O2 | 0.0087 (7) | 0.0118 (8) | 0.0181 (8) | 0.0005 (6) | −0.0013 (6) | 0.0012 (6) |
| O3 | 0.0224 (9) | 0.0174 (9) | 0.0175 (9) | 0.0029 (7) | −0.0051 (7) | −0.0030 (7) |
| O4 | 0.0250 (10) | 0.0228 (10) | 0.0237 (10) | 0.0053 (8) | 0.0051 (8) | −0.0068 (8) |
| O5 | 0.0148 (8) | 0.0154 (8) | 0.0120 (7) | −0.0021 (6) | −0.0019 (6) | −0.0032 (6) |
| O6 | 0.0135 (7) | 0.0151 (8) | 0.0144 (8) | −0.0012 (6) | −0.0007 (6) | −0.0049 (6) |
| O7 | 0.0288 (10) | 0.0179 (10) | 0.0275 (10) | −0.0044 (8) | −0.0037 (8) | −0.0001 (8) |
| O8 | 0.0184 (9) | 0.0366 (12) | 0.0305 (11) | −0.0099 (8) | 0.0025 (8) | −0.0026 (9) |
| N1 | 0.0169 (9) | 0.0138 (10) | 0.0181 (10) | −0.0024 (7) | 0.0002 (8) | −0.0021 (8) |
| N2 | 0.0204 (10) | 0.0178 (11) | 0.0137 (9) | −0.0049 (8) | −0.0012 (8) | −0.0004 (8) |
| C1 | 0.0140 (10) | 0.0113 (11) | 0.0164 (11) | −0.0027 (8) | −0.0004 (8) | −0.0023 (8) |
| C2 | 0.0167 (11) | 0.0139 (12) | 0.0264 (13) | −0.0007 (9) | −0.0003 (9) | −0.0013 (10) |
| C3 | 0.0182 (11) | 0.0162 (12) | 0.0299 (14) | 0.0012 (9) | −0.0099 (10) | 0.0040 (10) |
| C4 | 0.0229 (12) | 0.0191 (13) | 0.0164 (11) | −0.0073 (10) | −0.0057 (9) | 0.0014 (9) |
| C5 | 0.0178 (11) | 0.0127 (11) | 0.0149 (11) | −0.0032 (8) | −0.0024 (8) | −0.0005 (8) |
| C6 | 0.0100 (9) | 0.0100 (10) | 0.0185 (11) | −0.0021 (8) | −0.0015 (8) | 0.0002 (8) |
| C7 | 0.0136 (10) | 0.0113 (10) | 0.0104 (9) | −0.0026 (8) | −0.0001 (8) | −0.0033 (8) |
| C8 | 0.0126 (10) | 0.0114 (11) | 0.0138 (10) | 0.0001 (8) | −0.0018 (8) | −0.0022 (8) |
| C9 | 0.0132 (10) | 0.0134 (11) | 0.0132 (10) | −0.0001 (8) | −0.0025 (8) | −0.0032 (8) |
| C10 | 0.0149 (10) | 0.0146 (11) | 0.0176 (11) | −0.0027 (8) | −0.0012 (8) | −0.0010 (9) |
| C11 | 0.0232 (12) | 0.0250 (14) | 0.0145 (11) | −0.0040 (10) | −0.0002 (9) | −0.0012 (10) |
| C12 | 0.0273 (13) | 0.0242 (14) | 0.0151 (11) | −0.0021 (10) | −0.0033 (10) | −0.0078 (10) |
| C13 | 0.0222 (12) | 0.0157 (12) | 0.0197 (12) | −0.0031 (9) | −0.0063 (9) | −0.0033 (9) |
| C14 | 0.0196 (11) | 0.0153 (12) | 0.0155 (11) | −0.0029 (9) | −0.0016 (9) | 0.0000 (9) |
| Cu1—O5 | 1.942 (2) | C1—C2 | 1.384 (4) |
| Cu1—O6i | 1.946 (2) | C1—C6 | 1.397 (3) |
| Cu1—O2ii | 1.950 (2) | C2—C3 | 1.381 (4) |
| Cu1—O1iii | 2.008 (2) | C2—H2A | 0.93 |
| Cu1—O1 | 2.165 (2) | C3—C4 | 1.383 (4) |
| Cu1—Cu1i | 2.5891 (5) | C3—H3A | 0.93 |
| Cl1—C4 | 1.729 (3) | C4—C5 | 1.393 (4) |
| Cl2—C13 | 1.739 (3) | C5—C6 | 1.390 (3) |
| O1—C7 | 1.279 (3) | C5—H5A | 0.93 |
| O1—Cu1iii | 2.0075 (17) | C6—C7 | 1.490 (3) |
| O2—C7 | 1.246 (3) | C8—C9 | 1.502 (3) |
| O2—Cu1iv | 1.9501 (17) | C9—C10 | 1.388 (3) |
| O3—N1 | 1.221 (3) | C9—C14 | 1.400 (3) |
| O4—N1 | 1.236 (3) | C10—C11 | 1.382 (3) |
| O5—C8 | 1.263 (3) | C11—C12 | 1.388 (4) |
| O6—C8 | 1.262 (3) | C11—H11A | 0.93 |
| O6—Cu1i | 1.9459 (16) | C12—C13 | 1.380 (4) |
| O7—N2 | 1.223 (3) | C12—H12A | 0.93 |
| O8—N2 | 1.220 (3) | C13—C14 | 1.383 (3) |
| N1—C1 | 1.466 (3) | C14—H14A | 0.93 |
| N2—C10 | 1.472 (3) | ||
| O5—Cu1—O6i | 170.11 (7) | C4—C3—H3A | 120.3 |
| O5—Cu1—O2ii | 88.98 (7) | C3—C4—C5 | 121.7 (2) |
| O6i—Cu1—O2ii | 90.41 (7) | C3—C4—Cl1 | 119.2 (2) |
| O5—Cu1—O1iii | 90.80 (7) | C5—C4—Cl1 | 119.1 (2) |
| O6i—Cu1—O1iii | 88.11 (7) | C6—C5—C4 | 119.3 (2) |
| O2ii—Cu1—O1iii | 170.10 (6) | C6—C5—H5A | 120.3 |
| O5—Cu1—O1 | 97.86 (7) | C4—C5—H5A | 120.3 |
| O6i—Cu1—O1 | 91.67 (6) | C5—C6—C1 | 118.1 (2) |
| O2ii—Cu1—O1 | 108.91 (7) | C5—C6—C7 | 117.9 (2) |
| O1iii—Cu1—O1 | 80.92 (7) | C1—C6—C7 | 123.9 (2) |
| O5—Cu1—Cu1i | 85.61 (5) | O2—C7—O1 | 125.4 (2) |
| O6i—Cu1—Cu1i | 84.53 (5) | O2—C7—C6 | 118.2 (2) |
| O2ii—Cu1—Cu1i | 90.98 (5) | O1—C7—C6 | 116.31 (19) |
| O1iii—Cu1—Cu1i | 79.14 (5) | O6—C8—O5 | 126.5 (2) |
| O1—Cu1—Cu1i | 159.80 (5) | O6—C8—C9 | 116.6 (2) |
| C7—O1—Cu1iii | 127.17 (15) | O5—C8—C9 | 116.8 (2) |
| C7—O1—Cu1 | 133.75 (15) | C10—C9—C14 | 117.8 (2) |
| Cu1iii—O1—Cu1 | 99.07 (7) | C10—C9—C8 | 123.8 (2) |
| C7—O2—Cu1iv | 117.23 (15) | C14—C9—C8 | 118.4 (2) |
| C8—O5—Cu1 | 120.91 (15) | C11—C10—C9 | 122.9 (2) |
| C8—O6—Cu1i | 121.94 (15) | C11—C10—N2 | 115.9 (2) |
| O3—N1—O4 | 123.8 (2) | C9—C10—N2 | 121.1 (2) |
| O3—N1—C1 | 118.2 (2) | C10—C11—C12 | 118.8 (2) |
| O4—N1—C1 | 118.0 (2) | C10—C11—H11A | 120.6 |
| O8—N2—O7 | 124.6 (2) | C12—C11—H11A | 120.6 |
| O8—N2—C10 | 118.2 (2) | C13—C12—C11 | 119.0 (2) |
| O7—N2—C10 | 117.1 (2) | C13—C12—H12A | 120.5 |
| C2—C1—C6 | 122.5 (2) | C11—C12—H12A | 120.5 |
| C2—C1—N1 | 118.5 (2) | C12—C13—C14 | 122.2 (2) |
| C6—C1—N1 | 119.0 (2) | C12—C13—Cl2 | 119.5 (2) |
| C3—C2—C1 | 118.9 (2) | C14—C13—Cl2 | 118.3 (2) |
| C3—C2—H2A | 120.6 | C13—C14—C9 | 119.3 (2) |
| C1—C2—H2A | 120.6 | C13—C14—H14A | 120.4 |
| C2—C3—C4 | 119.5 (3) | C9—C14—H14A | 120.4 |
| C2—C3—H3A | 120.3 | ||
| O5—Cu1—O1—C7 | 89.7 (2) | Cu1iii—O1—C7—O2 | 4.5 (3) |
| O6i—Cu1—O1—C7 | −92.9 (2) | Cu1—O1—C7—O2 | −174.59 (15) |
| O2ii—Cu1—O1—C7 | −1.9 (2) | Cu1iii—O1—C7—C6 | 179.81 (14) |
| O1iii—Cu1—O1—C7 | 179.3 (2) | Cu1—O1—C7—C6 | 0.7 (3) |
| Cu1i—Cu1—O1—C7 | −171.52 (14) | C5—C6—C7—O2 | 76.9 (3) |
| O5—Cu1—O1—Cu1iii | −89.55 (8) | C1—C6—C7—O2 | −107.4 (3) |
| O6i—Cu1—O1—Cu1iii | 87.82 (8) | C5—C6—C7—O1 | −98.7 (2) |
| O2ii—Cu1—O1—Cu1iii | 178.83 (6) | C1—C6—C7—O1 | 77.0 (3) |
| O1iii—Cu1—O1—Cu1iii | 0.000 (2) | Cu1i—O6—C8—O5 | 8.8 (3) |
| Cu1i—Cu1—O1—Cu1iii | 9.18 (17) | Cu1i—O6—C8—C9 | −171.10 (15) |
| O2ii—Cu1—O5—C8 | −88.27 (18) | Cu1—O5—C8—O6 | −7.7 (3) |
| O1iii—Cu1—O5—C8 | 81.83 (18) | Cu1—O5—C8—C9 | 172.23 (15) |
| O1—Cu1—O5—C8 | 162.78 (18) | O6—C8—C9—C10 | 160.5 (2) |
| Cu1i—Cu1—O5—C8 | 2.79 (17) | O5—C8—C9—C10 | −19.5 (4) |
| O3—N1—C1—C2 | −167.1 (2) | O6—C8—C9—C14 | −20.7 (3) |
| O4—N1—C1—C2 | 11.5 (3) | O5—C8—C9—C14 | 159.4 (2) |
| O3—N1—C1—C6 | 11.7 (3) | C14—C9—C10—C11 | −1.9 (4) |
| O4—N1—C1—C6 | −169.6 (2) | C8—C9—C10—C11 | 177.0 (2) |
| C6—C1—C2—C3 | −0.8 (4) | C14—C9—C10—N2 | 174.1 (2) |
| N1—C1—C2—C3 | 177.9 (2) | C8—C9—C10—N2 | −7.1 (4) |
| C1—C2—C3—C4 | −0.6 (4) | O8—N2—C10—C11 | −64.3 (3) |
| C2—C3—C4—C5 | 1.5 (4) | O7—N2—C10—C11 | 112.1 (3) |
| C2—C3—C4—Cl1 | −177.4 (2) | O8—N2—C10—C9 | 119.4 (3) |
| C3—C4—C5—C6 | −0.8 (4) | O7—N2—C10—C9 | −64.1 (3) |
| Cl1—C4—C5—C6 | 178.02 (18) | C9—C10—C11—C12 | 2.3 (4) |
| C4—C5—C6—C1 | −0.6 (3) | N2—C10—C11—C12 | −173.9 (2) |
| C4—C5—C6—C7 | 175.3 (2) | C10—C11—C12—C13 | −0.6 (4) |
| C2—C1—C6—C5 | 1.5 (3) | C11—C12—C13—C14 | −1.5 (4) |
| N1—C1—C6—C5 | −177.3 (2) | C11—C12—C13—Cl2 | 178.9 (2) |
| C2—C1—C6—C7 | −174.2 (2) | C12—C13—C14—C9 | 1.8 (4) |
| N1—C1—C6—C7 | 7.0 (3) | Cl2—C13—C14—C9 | −178.53 (19) |
| Cu1iv—O2—C7—O1 | −3.4 (3) | C10—C9—C14—C13 | −0.2 (4) |
| Cu1iv—O2—C7—C6 | −178.60 (15) | C8—C9—C14—C13 | −179.1 (2) |
| Symmetry codes: (i) −x, −y, −z+1; (ii) x−1, y, z; (iii) −x+1, −y, −z+1; (iv) x+1, y, z. |
| D—H···A | D—H | H···A | D···A | D—H···A |
| C2—H2A···O4v | 0.93 | 2.44 | 3.254 (3) | 146 |
| C11—H11A···O8vi | 0.93 | 2.46 | 3.384 (3) | 172 |
| C14—H14A···O4i | 0.93 | 2.54 | 3.417 (3) | 156 |
| Symmetry codes: (v) −x, −y+1, −z+1; (vi) −x+1, −y, −z; (i) −x, −y, −z+1. |
| Cu1—O5 | 1.942 (2) | Cu1—O1iii | 2.008 (2) |
| Cu1—O6i | 1.946 (2) | Cu1—O1 | 2.165 (2) |
| Cu1—O2ii | 1.950 (2) |
| Symmetry codes: (i) −x, −y, −z+1; (ii) x−1, y, z; (iii) −x+1, −y, −z+1. |
| D—H···A | D—H | H···A | D···A | D—H···A |
| C2—H2A···O4iv | 0.93 | 2.44 | 3.254 (3) | 146 |
| C11—H11A···O8v | 0.93 | 2.46 | 3.384 (3) | 172 |
| C14—H14A···O4i | 0.93 | 2.54 | 3.417 (3) | 156 |
| Symmetry codes: (iv) −x, −y+1, −z+1; (v) −x+1, −y, −z; (i) −x, −y, −z+1. |
HKF thanks the Malaysian Government and Universiti Sains Malaysia for the Science Fund grant No. 305/PFIZIK/613312.
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The ability to induce DNA cleavage in the presence of H2O2 and reductants by phenanthroline-based copper complexes such as [Cu(imda)(5,6-dmp)] (where 5,6-dmp is 5,6-dimethyl-1,10-phenanthroline) and [Cu(N,N'-dialkyl-1,10-phenanthroline -2,9-dimethanamine)] (Balaraman et al., 2006; Tomoya et al., 2005) have driven us to investigate the DNA cleavage ability of benzoic acid-based copper complexes. Several benzoic acid-based copper complexes have been prepared in our laboratory and their DNA cleavage abilities are further investigated. In this paper, we report the crystal structure of the title compound.
In the title compound, the coordination geometry around each CuII ion can be described as square-pyramidal, formed by five O atoms from the carboxylate groups of five 5-chloro-2-nitrobenzoate ligands. The basal plane positions are occupied by atoms O5, O6A, O2B and O1C with an average Cu—O bond length of 1.962 (2) Å. The apical position is occupied by atom O1 (Fig.1). The Cu1 atom is displaced away from the basal plane by 0.1689 (3) Å and the Cu—Cu(-x,-y,1 - z) separation is 2.5891 (4) Å. Similar CuO5 coordination were observed in related structures reported by Kabbani et al. (2004) and Stachová et al. (2004). The CuO5 square pyramids are edge-shared to form a linear polymeric chain along the a axis. In the chain, the CuII ions are alternately separated by 2.5891 (4) and 3.1763 (4) Å.
Bond lengths of the ligands have normal values (Allen et al., 1987). The dihedral angle between nitro groups and the benzene rings are: C1–C6/N1/O3/O4 = 12.0 (3)° and C9–C14/N2/O7/O8 = 65.1 (3)°.
The polymeric chains are interconnected through C—H···O intramolecular interactions, forming a three-dimensional network (Table 2 and Fig. 2).