Infrared spectroscopic studies on metal carbonyl compounds—VI : Infrared spectroscopic studies on two isomeric forms of dicobalt octacarbonyl in solutinos

Abstract

The doublet shape of some of the C-O stretching bands in solution spectra of Co 2 (CO) 8 has led to the assumption of the existence of two isomeric forms of this compound. Correlating its spectrum with spectra of two types of cobalt carbonyl derivatives, with and without bridging CO groups, respectively, most of the C-O stretching bands could unequivocally be assigned to one of the two forms. Isomer I possesses a structure corresponding to that of the crystalline substance, whereas for isomer II a structure could be made probable in which there is a tetragonal pyramidal configuration around the cobalt atoms, held together only by a linear metal-metal bond.