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) (H(2)bqdc = 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, a = 14.141(3) angstrom, b = 10.021(2) angstrom, c = 18.511(4) angstrom, beta = 103.78(3)degrees, V = 2547.6(9) angstrom(3), Z = 4. Crystal data for 2: monoclinic system, p2(1)/n, a = 13.656(3) angstrom, b = 10.015(2) angstrom, c = 19.127(4) angstrom, beta = 107.13(7)degrees, V = 2500.1(9) angstrom(3), Z = 4. Crystal data for 3: monoclinic system, C2/c, a = 14.5050(8) angstrom, b = 15.1932(8) angstrom, c = 12.7549(6) angstrom, beta = 116.8010(11)degrees, V = 2508.9(2) angstrom(3), Z = 4. Crystal data for 4: monoclinic system, C2/c, a = 14.1732(17) angstrom, b = 16.115(3) angstrom, c = 12.809(3)angstrom, beta = 117.04(3)degrees, V = 2605.7(8) angstrom(3), Z = 4. 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 pi-pi interactions. Compounds I 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. (C) 2005 Elsevier Inc. All rights reserved.