One-dimensional hydrogen-bonded infinite chain from nickel(II) tetraaza macrocyclic complex and 1,2-cyclopentanedicarboxylate ligand

Abstract

The reaction of [Ni(L)]Cl 2· 2H 2O (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo [14,4,0 1.18,0 7.12]docosane) with trans-1,2-cyclopentanedicarboxylic acid (H 2-cpdc) yields a 1D hydrogen-bonded infinite chain with formula [Ni(L)(H-cpdc -) 2] (1). This complex has been characterized by X-ray crystallography, spectroscopy and cyclic voltammetry. The crystal structure of 1 exhibits a distorted octahedral geometry about Ni atom with four nitrogen atoms of the macrocycle and two oxygen atoms of the H-cpdc - ligand at the axial position. Compound 1 crystallizes in the monoclinic system P2 1/c with a = 8.7429(17), b = 10.488(2), c = 18.929(4) Å, β = 91.82(2), V = 1734.8(6) Å 3, Z = 2. Electronic spectrum of 1 reveals a high-spin octahedral environment. Cyclic voltammetry of 1 undergoes two waves of a one-electron transfer corresponding to Ni II/Ni III and Ni II/Ni I processes. © 2011 by the authors; licensee MDPI, Basel, Switzerland.