Synthesis, characterization and properties of series coordination polymers constructed from a biphenyl dicarboxylate and nitrogen-containing mixed ligands

A series of coordination polymers have been prepared by the combination of flexible ligand 1,1'-biphenyl-2,2'-dicarboxylic acid (H(2)dpa) and different types of nitrogen-containing ligands, with various metal ions such as Co(II), Zn(II) and Cd(II). The single-crystal structure analyses reveal that the above complexes possess different structure features with the introduction of different nitrogen-containing ligands. When auxiliary linear ligand 4,4'-bipyridine (4,4'-bpy) is introduced, two-dimensional layered complex, [Co-2(dpa)(2)(4,4'-bpy)(2)(H2O)](n) (1) is formed. Whereas if chelating ligand, 1,10-phenanthroline (1,10'-phen) and 2,2'-bipyridine (2,2'-bpy) are introduced, one-dimensional complex [Zn(dpa)(1,10'-phen)](n) (2) and discrete complexes [Co-2(dpa)(2)(2,2'-bpy)(2)(H2O)(2)] (3), [Co-3(dpa)(3)(1,10'-phen)(6)(H2O)(2)] (4), [Cd(dpa)(1,10'-phen)(2)][(H(2)dpa)(2)(H2O)(2)] (5) are synthesized. To our interest, 1 and 2 crystallize in homochiral space-group. Furthermore, the magnetic property of complex 1 and the fluorescent properties of complexes 2 and 5 are studied. Crown Copyright (C) 2009 Published by Elsevier B. V. All rights reserved.