2016. 57, 5 – UDC 548.73:541.49:546.48 CRYSTAL STRUCTURES AND LUMINESCENCE PROPERTIES OF A ONE-DIMENSIONAL CADMIUM COORDINATION POLYMER DERIVED FROM A FLEXIBLE bis(IMIDAZOLE) LIGAND X. Zhang, Y.G. Liu, G.H. Cui College of Chemical Engineering, Hebei United University, Tangshan, Hebei Province, P. R. China E-mail: tscghua@126.com Received January, 21, 2015 A new Cd(II) coordination polymer, namely [Cd(pbmb)(mip)]n (pbmb = 1,1-(1,3-propane)bis(2-methylbenzimidazole), H2mip = 5-methylisophthalic acid), is hydrothermally synthesized and characterized by elemental analyses, infrared spectroscopy and single crystal X-ray diffraction analyses. <...> In the complex, adjacent dinuclear units [Cd2(pbmb)2] are bridged by mip2– ligands in the 2-u2, u1 coordination modes to construct 1D ladder-like chains which are additionally assembled into a 2D supramolecular network via C—H interactions. <...> Over the past few years, the design and construction of metal-organic coordination polymers (MOCPs) have been rapidly developing because of their fascinating structural diversities and potential applications in gas storage and absorption, luminescence, magnetism, sensing and so on [1—4]. <...> Generally, the construction of MOCPs can be controlled by the reasonable design and sensible choice of organic ligands, solvents, pH value, and metal atoms. <...> Therefore, the selective design of organic ligands is usually crucial for the formation of novel metal-organic frameworks [ 5, 6 ]. <...> Flexible bis(benzimidazole) ligands, such as 1,4-bis(5,6-dimethyl-benzimidazolyl)-2-butene, 1,3-bis(imidazol1-ylmethyl)benzene and 1,4-bis(imidazol-1-ylmethyl)-benzene [ 7, 8 ], have been widely used and serve as N-containing ligands having rich structural information and free conformation. <...> Due to the presence of a —CH2— spacer this sort of bis(benzimidazole) ligands can act as bridges to construct high dimensional frameworks [ 9, 10 ]. <...> Inside the series of bis(benzimidazole) derivatives, 1,1-(1,3propane)bis-(2-methylbenzimidazole)(pbmb) is especially outstanding for the 2-position methyl substituent of the benzimidazole ring can effectively enhance the electron donating ability of the ligand, which make pbmb exhibit a strong collaborative coordination ability with organic carboxyl ligands [ 11, 12 ]. <...> When it comes to aromatic carboxylate ligands <...>