CO-ORDINATION COMPLEXES OF TITANIUM (IV) HALIDES: 1. PREPARATION AND INFRARED SPECTRA OF THE COMPLEXES OF TITANIUM (IV) HALIDES WITH N,N-DIMETHYL AND N,N-DIPHENYL FORMAMIDE

Co-ordination complexes of titanium (IV) halides with N,N-dimethyl formamide and N,N-diphenyl formamide have been prepared and their infrared spectra have been measured. In all these complexes, there is a metal-to-oxygen bond as evidenced in the infrared spectra by a negative shift of the carbonyl stretching frequency and a positive shift of the CN stretching frequency. The relative values of these shifts and the ease of decomposition observed for these complexes indicate that their stability decreases with decreasing the electronegativity of the halide bonded to titanium (IV).In the complexes of N,N-diphenyl formamide, the effect of the conjugated phenyl groups has been observed. In these complexes the decrease of double-bond character of the carbonyl group and the increase of double-bond character of the CN group, resulting from the metal-to-oxygen co-ordination bond, are quite larger than in the complexes of N,N-dimethyl formamide.