Synthesis, structures and properties of dinuclear cadmium(II) complexes based on polybenzimidazole binucleating ligands |
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Authors: | Feng-Mei Nie Min Li Zhen Li |
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Institution: | a Department of Chemistry, Capital Normal University, Beijing 100048, PR China b Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences, Beijing 100080, PR China |
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Abstract: | Three novel cadmium(II) complexes Cd2(tbpo)(O2CC6H4-p-NO2)2]ClO4·3CH3OH (1) Cd2(bbap)(O2CC6H4-p-NO2)2]ClO4·4.5CH3OH·0.75H2O (2) and Cd(ntb)(O2CC6H4-p-NO2)]ClO4·4CH3OH (3) have been synthesized and characterized by IR, elemental analysis, 1H NMR and X-ray crystallography, where tbpo− and bbap− are anions of N,N,N′,N′-tetrakis(2-benzimidazolylmethyl)-2-hydroxo-1,3-diaminopropane and 2,6-bisbis(2-benzimidazolylmethyl)aminomethyl]-4-methylphenol, respectively; ntb is tris(2-benzimidazolymethyl)amine. Complexes 1 and 2 contain μ-phenolate-bridged and μ-alkoxo-bridged dicadmium(II) cores with the Cd1?Cd2 separation of 3.671 Å for complex 1 and 3.718 Å for 2. One of the 4-nitrobenzoate anions bridged the two cadmium(II) ions in syn-anti mode through its carboxylate group, the other 4-nitrobenzoate is only coordinated with Cd2 in bidentate chelating mode. The two central cadmium(II) atoms are in trigonal bipyramidal and pentagonal bipyramidal geometry. In complex 3, the cadmium(II) atom is coordinated with four nitrogen atoms of ntb and one carboxylate oxygen atom of 4-nitrobenzoate in distorted trigonal bipyramidal geometry. Experiment shows that there is a higher affinity of 4-nitrobenzoate anion as coligand with the dinuclear Cd2(tbpo)]3+ and Cd2(bbap)]3+ cores than that with the mononuclear Cd(ntb)]2+ core. |
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Keywords: | Cadmium(II) complex Binucleating ligand Benzimidazole Crystal structure |
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