The Structure of Three-Coordinated Copper(II) Complexes and the Infrared C=O Stretching Vibration

Abstract

A new type of binuclear structure having copper atoms of ligancy 4 is proposed on the basis of infrared C=O stretching vibrations for the so-called three-coordinated copper(II) complexes showing a normal magnetic moment. In this binuclear structure, copper atoms are bridged in pairs by two Cu-O-C-O-Cu links of syn-anti arrangement. Suggestion is made that "three-coordinated" copper(II) complexes in the literal sense of the word do not exist regardless of whether the complexes show normal or subnormal magnetic moments.