Synthesis, characterization and crystal structure of Ni(II) coordination polymer with 1,3,5 benzenetricarboxylic acid and 2,2′-bipyridine ligands

A Ni(II) coordination polymer namely {[Ni-2(btc)2(bpy)2(mu-H2O)(2))2(H2O)(2)POPY)(H2O)41)}4H(2)O (1) ((H(3)btc is 1,3,5-benzenetricarboxylic acid and bpy is 2,2'-bipyridine) with nickel acetate tetrahydrate, was prepared under hydrothermal conditions and characterized by single crystal X-ray diffraction, FTIR, TGA and elemental analysis techniques. In compound (1), the asymmetric part of the unit cell was found to contain two independent halves of centrosymmetric, binuclear water-bridged complex [Ni2(mu-H2O)(2)(H2O)(2)(btc)(2)(bpy)(2)](2-), an equivalent of the [Ni(bpy)(H2O)(4)](2+))(H2O)(4)](2+) complex and four uncoordinated water molecules. Single crystal X-ray analysis revealed that the complex crystallizes in the triclinic P-1 space group, with a = 9.0787(3) angstrom, b = 10.5726(4) angstrom, c = 30.0065(11) angstrom, alpha = 83.439(3)degrees, beta = 88.213(3)degrees and gamma = 65.361(4)degrees, A 3D coordination polymer network as a supramolecular structure is formed by means of numerous hydrogen bonds involving all hydrogen atoms from water molecules and carboxylate groups of btc ligands. (C) 2013 Elsevier B.V. All rights reserved.