ZnII/CdII-coordination polymers from 1D chain, 2D layer to 3D framework with imidazole-based dicarboxylate ligand

Three Zn-II/Cd-II-coordination polymers based on 2-propyl-4,5-imidazoledicarboxylate (H(3)pimdc), namely, [Zn(Hpimdc)H2O](n) (1), [Cd(H(2)pimdc)(2)](n) (2) and [Cd-2(Hpimdc)(2)(bbi)(0.5)(H2O)(2)](n) [bbi = 1,10-(1,4-butanediyl)bis(imidazole)] (3), have hydrothermally been synthesized, which exhibit a systematic dimensional variation by changing the metal ions or introducing the auxiliary ligand. Complex 1 is a 1D zig-zag polymeric chain, which is finally extended into a 3D supramolecular network through R-4(4) (12) O-H center dot center dot center dot O H-bonding rings. Complex 2 shows a 2D layer comprised alternately arranged left-and right-handed helical chains. Complex 3 features a rare (3,3)-connected 8(3) network with opposite chiral layers in a slipped ABAB fashion. The photoluminescent properties and thermal stabilities of three complexes are also discussed. Crown Copyright (C) 2011 Published by Elsevier B. V. All rights reserved.