Reactivity of co-ordination compounds in the solid state. Part 1. Mixed-ligand complexes of oxalate and 2,2′-bipyridlyl with copper(II), their preparation, interconversion, and novel solid-state reactivity

Abstract

Mixed-ligand complexes of oxalate and 2,2′-bipyridyl with copper(II) have been prepared and characterized. Polymorphism has unequivocally been shown to occur. One form of the complex is correctly described as a mixed chelate; another modification is possibly a double salt or more likely a polymeric structure involving bridging oxalates. The complexes have been characterized by their electronic, e.s.r., and i.r. spectra and X-ray diffraction patterns. Unusually, interconversion of the various forms occurs in the solid state. The solid-state reactivity of these complexes and their diverse nature has not been appreciated in earlier studies.