Cadmium coordination polymers based on flexible bis(imidazole) ligands: A rare example for doublet of doublet cadmium polyhedron arrangements

C N, Babu and Paladugu, S and N, Sampath and G, Prabusankar (2014) Cadmium coordination polymers based on flexible bis(imidazole) ligands: A rare example for doublet of doublet cadmium polyhedron arrangements. Journal of Molecular Structure, 1075. pp. 147-153. ISSN 0022-2860

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Abstract

Two one-dimensional (1D) coordination polymers, [{LCd(O2NO) 2(DMF)2}2{(LCd(O2NO) 2(DMF))(DMF)}2]n (1) and [L′Cd(O 2NO)(ONO2)(DMF)2]n (2), having an aryl chromophoric unit and a flexible bis(imidazole) tail, 9,10- bis{(benzimidazol)methyl}anthracene (L) and 1,4-bis{(imidazol)methyl}benzene (L′), with various coordination modes have been obtained. Molecule 1 represents the first structurally characterized one dimensional coordination polymer consisting of both hepta- and octa-coordinated cadmium centers. In 1, two distorted pentagonal bipyramidal Cd(II) centers and two distorted triangular dodecahedral Cd(II) centers are alternately arranged via bridging bidentate N,N-chelating ligand, L. Whereas, a distorted pentagonal bipyramidal Cd(II) center is formed in 2 where the sterically less crowded L′ serves as a bridging bidentate N,N-chelating ligand. Furthermore, 1 and 2 have been characterized by elemental analysis, FT-IR, 1H NMR, UV-vis and fluorescent techniques.

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