Anion effect on construction of two Cd(II) coordination polymers with phenylformic acid-imidazole ditopic ligand: Hydrothermal synthesis, crystal structure and antimicrobial activity

Author： Gao Jian Wei Kai-Ju Ni Jia Zhang Ju-Zhou

Publisher： Taylor & Francis Ltd

ISSN： 0095-8972

Source： Journal of Coordination Chemistry, Vol.62, Iss.2, 2009-01, pp. : 257-265

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Abstract

Two new coordination polymers, [Cd(L-H)2]∞ (1) and [Cd(L-H)(NO3)]∞ (2) (L = C10H8N2O2), have been synthesized by hydrothermal reactions of 4-(imidazole-1-yl)-benzoic acid and CdX2 (X = [image omitted] and [image omitted]). X-ray single crystal diffraction demonstrates that the counterion has an important effect on the assembly process. Crystals of 1 were orthorhombic, space group Pnna, with a = 13.8052(6), b = 16.5126(10) and c = 8.2158(12). Complex 2 crystals were isolated as orthorhombic, space group Pbca, with a = 7.9988(6), b = 15.8290(11) and c = 17.9580(13). Cd2+ is six-coordinate in a distorted octahedral geometry in both complexes. In 1, L bridges the metal centers with the intramolecular Cd ··· Cd separation of 11.651 Å, resulting in an infinite rhombic grid; [image omitted] is not in the grid. In 2, adjacent Cd(II)'s were linked by L, and further by nitrate and carboxylate, producing an infinite zigzag chain. The toxicity of the two complexes is evaluated by testing antimicrobial activity against bacterial strands using the agar diffusion method.