One-dimensional bimetallic cyano complexes with nicotinamide and isonicotinamide ligands

•New 1D bimetallic Cu(II)/Ni(II) coordination complexes were synthesized.•The complexes were characterized by different analyses methods.•The Ni(II) ions are coordinated in square planar geometry.•The Cu(II) ions are coordinated in distorted octahedral arrangement.

Two new 1D bimetallic Cu(II)/Ni(II) coordination polymers, {[Cu(NH3)4(μ-na)][Ni(CN)4]}n (1) and {[Cu(NH3)2(ina)2Ni(μ-CN)2(CN)2]}n (2) (na: nicotinamide, ina: 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, NH⋯π, CH⋯Ni and Ni⋯π interactions to form 3D supramolecular network.