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27 November 2022
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Cu(II) coordination polymers [Cu(tda)(phen)]1.5H2O (1a), [Cu(tda)(py)] (2a) and [Cu(tda)(bipy)(H2O)]0.5H2O (3a) (tda = thiodibenzoic acid, phen = phenanthroline, py = pyridine, bipy = bipyridine) have been synthesized by slow diffusion. Under solvothermal conditions, [Cu(tda)(phen)]2H2O (1b), [Cu(tda)(H2O)] (2b) and [Cu(tda)(bipy)] (3b) were isolated. The structures of the complexes 1a–3a have been determined by single X-ray diffraction. The experimental X-ray powder diffraction patterns of 1b–3b were compared with the calculated patterns of 1a–3a. The polymers were found to exhibit structural and dimensional diversity due to the effect of the co-ligands. In complexes 1a and 1b, tda is found to coordinate with the metal atom in a monodentate mode, while in 2a and 2b, the carboxylate oxygens are coordinated with the two metal centers in a μ-bridged bidentate fashion. The structural analysis of 3a shows that the copper atom is in a square pyramidal environment, whereby the metal atom is coordinated with the carboxylate oxygens of two different tda ligands in a monodentate fashion and two nitrogens of the bipyridine ligand and one coordinated water. The IR spectrum of 3b implies a bidentate mode of coordination.
