One-dimensional bimetallic cyano complexes with nicotinamide and isonicotinamide ligands

Abstract

Two new 1D bimetallic Cu(II)/Ni(II) coordination polymers, {[Cu(NH3)(4)(mu.-na)][Ni(CN)(4)]}(n) (1) and {[Cu(NH3)(2)(ina)(2)Ni(mu-CN)(2)(CN)(2)]}(n) (2) (na: nicotinamide, Ma: isonicotinamide) have been synthesized and characterized by vibrational (FT-IR and Raman) spectroscopy, elemental, thermal analyses, and single crystal X-ray diffraction techniques. In both of the complexes, Ni(II) ion is four coordinate with four cyanide-carbon atoms in a square-planar geometry. In 1, the [Ni(CN)(4)](2-) ion acts as a counter-ion, whereas it coordinated to the Cu(II) ions as a bridging ligand in 2. In 1 and 2, each Cu(II) ion is coordinated in a distorted octahedral geometry. Single crystal X-ray analysis showed that 1 and 2 exhibit one-dimensional linear chain running along the crystallographic a-axis and b-axis direction, respectively. Adjacent chains are further stacked through intermolecular hydrogen bonding, N-H...pi, C-H...Ni and Ni...pi interactions to form 3D supramolecular network. (C) 2013 Elsevier B.V. All rights reserved.