Syntheses, crystal structures and spectral properties of 1D tetracyanonickelate(II) complexes with 1-ethylimidazole

Abstract

Three new cyano-bridged tetracyanonickelate(II) complexes with 1-ethylimidazole (etim) ligand, [Ni(etim)(4)Ni(mu-CN)(2)(CN)(2)](n) (1), [Zn(etim)(4)Ni(mu-CN)(2)(CN)(2)](n) (2) and {[Cd(etim)(4)Ni(mu-CN)(2)(CN)(2)](2)center dot 2H(2)O}(n) (3) have been synthesized and characterized by spectroscopic (IR and Raman) and X-ray diffraction techniques. According to the crystallographic data, it was understood that the complexes with the chain 2,2-TT structures belong to P-1 space group of triclinic crystal system. In the complexes, it was observed that Ni(II), Zn(II) and Cd(II) ions have distorted octahedral geometries. In the [Ni(mu-CN)(2)(CN)(2)](2-) anion, the Ni(II) ion is coordinated by the four carbon atoms of the four cyano ligands, and exhibits square-planar coordination geometry. The crystallographic analyses reveal that the crystal structures of complexes 1-3 are one dimensional linear chain polymers and these chains are held together by the C-H center dot center dot center dot pi, C-H center dot center dot center dot Ni and hydrogen bonding interactions, forming three-dimensional networks