Two-Dimensional Heteropolynuclear Zn(II) and Cd(II)-Tetracyanopalladate(II) Complexes with the 1-Ethylimidazole Ligand Exhibiting C-H⋯Pd Interactions

Abstract

The cyano-bridged heteronuclear complexes [Zn(etim)<inf>2</inf>Pd(μ-CN) <inf>4</inf>]<inf>n</inf> (1) and [Cd(etim)<inf>2</inf>Pd(μ-CN) <inf>4</inf>]<inf>n</inf> (2) (etim = 1-ethylimidazole), have been synthesized and characterized by FT-IR, Raman spectroscopy, thermal and elemental analyses. The crystal structures of the complexes have been determined by X-ray single crystal diffraction. In the complexes, the Pd(II) ion is coordinated by four cyano ligands, forming a square-planar geometry, and the Zn(II) or Cd(II) ions are coordinated by six N atoms from four bridging cyano ligands and two etim ligands in a distorted octahedral geometry. The most important features of the complexes are the presence of C-H···Pd hydrogen-bonding interactions between the Pd(II) ion and the hydrogen atoms of the etim ligand. © 2013 Elsevier Ltd. All rights reserved.