Preparation of binuclear copper-cobalt compounds. Crystal structure of (tmed)CuCo(CO)4

Article abstract of DOI:10.1021/om00124a014

The reaction of L₂CuCl with Co(CO)₄^- or Co(CO)₃PR₃^- leads to the formation of binuclear Cu-Co complexes. Solution infrared data indicates that these complexes contain a single Cu-Co bond with no CO-Cu interaction. The solid-state spectra were similar except for that of (tmed)CuCo(CO)₄ which exhibits a low-frequency band at 1820 cm^-1. A single-crystal structural analysis of this material was undertaken. The molecule [(CH₃)₂NCH₂CH₂N(CH₃) ₂]CuCo(CO)₄ crystallizes in the orthorhombic space group Pna2₁ with a = 16.681 (3) ?, b = 8.797 (1) ?, and c = 9.994 (1) ?. Full-matrix least-squares refinement with anisotropic temperature factors for the non-hydrogen atoms and fixed, isotropic thermal parameters for the hydrogens have converged to R = 0.051 and R_w = 0.053 for the 862 observed reflections. The Cu and Co are bonded at a distance of 2.38 ?. One of the carbonyl groups asymmetrically bridges the Cu-Co bond; the three remaining carbonyls are terminally bonded to the Co atom. The tmed molecule functions as a bidentate ligand on the Cu, which exhibits nearly planar coordination.