Synthesis, spectral and thermal studies, and crystal structure of cis-bis(4-methylimidazole)bis(picolinato)copper(II) [Cu(pic)(2)(4-MeIm)(2)]

Abstract

The mixed-ligand picolinato (pic) complex of Cu(II) with 4-methylimidazole (4-MeIm), [Cu(pic)(2)(4-MeIM)(2)], was synthesized and characterized by elemental analysis, magnetic susceptibility, spectroscopic methods (UV/vis and FT-IR) and X-ray diffraction. In the slightly distorted octahedral cis-bis(4-methylimidazole)bis(picolinato)copper(II) complex, the pic ligands are coordinated to the Cu(II) ion as bidentate N,O-donors forming chelate rings. The 4-MeIm ligands are N-coordinated in cis positions. The complex crystallizes in the triclinic space group P(1) over bar with unit cell parameters a = 9.204(5), b = 9.498(5), c = 13.095(5) angstrom, alpha = 90.395(5), beta = 101.687(5), gamma = 112.291(5)degrees and Z = 2. Hydrogen bondings and C-H center dot center dot center dot pi interactions occur between picolinato and methylimidazole ligands of neighboring complex molecules. The thermal decomposition of the complex is described.