Preparation and properties of some carbonyl-bridged dinuclear copper complexes

Article abstract of DOI:10.1021/om00072a012

Several complexes of the type (diamine)₂Cu₂(CO)(0₂CR)⁺X ^-, which contain both a carbonyl and a carboxylate group bridging two coppers, have been prepared. The preferred method of synthesis involves the reaction of T1(0₂CR) and (diamine)CuI under a CO atmosphere. All the complexes are characterized by a CO absorption in the infrared at approximately 1900-1950 cm^-1. A related compound, (tmed)₂Cu₂(CO)C₄O₄, which contains a bridging squarate group, was also prepared and the structure of its CH₂C1₂ solvate characterized by single-crystal X-ray diffraction. The geometry of the squarate complex is quite similar to that of the benzoate derivative in spite of the charge difference and the much larger "bite" of the squarate ligand compared to the benzoate group.