Design and synthesis of four coordination polymers generated from 2,2′-biquinoline-4,4′-dicarboxylate and aromatic bidentate ligands

Four coordination polymers [Zn(bqdc)(phen)]n (1), [Zn(bqdc)(bpy)(H2O)]n (2), [Mn(bqdc)(bpy)(H2O)2]n (3) and [Mn(bqdc)(phen)(H2O)2]n (4) (H2bqdc=2,2′-biquinoline-4,4′-dicarboxylic acid, phen=1,10-phenanthroline and bpy=2,2′-bipyridyl) have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. Crystal data for 1: monoclinic system, C2/c, image, image, image, image, image, image. Crystal data for 2: monoclinic system, p21/n, image, image, image, image, image, image. Crystal data for 3: monoclinic system, C2/c, image, image, image, image, image, image. Crystal data for 4: monoclinic system, C2/c, image, image, image, image, image, image. Single helix-like chains exist in 1. The supramolecular structure of 1 exhibits extended two-dimensional network while 2–4 display extended three-dimensional architectures based on interchain hydrogen bonding and image interactions. Compounds 1 and 2 show blue photoluminescence under UV light suggesting that they may be employed to develop luminescent materials. Compounds 3 and 4 show interesting magnetic behaviors.