Cobalt (II) coordination polymers based on 3,5-dinitrobenzoate and flexible bis(benzimidazole) derivatives bearing different spacer lengths and substituents |
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| Authors: | Xiu-Li Wang Song Yang Guo-Cheng Liu Li–Li Hou Hong-Yan Lin Ai-Xiang Tian |
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| Institution: | (1) Department of Chemistry, Liaoning Province Silicon Materials Engineering Technology Research Centre, Bohai University, Jinzhou, 121000, People’s Republic of China |
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| Abstract: | Three new CoII coordination polymers, namely Co(DNBA)2(pbdmbm)] (1), Co2(H2O)2(DNBA)2(ebdmbm)2] (2) and Co2(DNBA)2(pbbm)2] (3) have been obtained by hydrothermal reactions of CoII with flexible bis(benzimidazole) ligands 1,1′-(1,3-propanediyl)bis(5,6-dimethylbenzimidazole) (pbdmbm), 1,1′-(1,2-ethanediyl)bis(5,6-dimethylbenzimidazole)
(ebdmbm), 1,1′-(1,3-propanediyl)bis(benzimidazole) (pbbm)] plus 3,5-dinitrobenzoic acid (HDNBA). The complexes have been characterized
by single crystal X-ray diffraction, elemental analyses, IR and TG. Complexes 1 and 3 exhibit one-dimensional chains composed of CoII centers bridged by flexible bis(benzimidazole) ligands. Complex 2 is a three-dimensional NaCl-type supramolecular framework constructed from binuclear units, which are formed by two CoII centers and two ebdmbm ligands. The spacer length and substituents on the bis(benzimidazole) ligands are crucial for the
construction of these structures. The photoluminescence properties of the complexes and the cyclic voltammetry behavior of
complex 1 are described. |
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