Adducts of Group III trihalides with trimethylamine and trimethylphosphine

Abstract

Vibrational spectra are reported for MX₃,NMe₃(M = Ga, Al; X = Cl, Br, I) and AlCl₃,py. Cryoscopic molecular weights in benzene are given for all these trimethylamine adducts, except in the case of GaBr₃,NMe₃. The results show the presence of a four-co-ordinated monomeric species in all cases. The formation of AlCl₃,2Me₃P, GaCl₃,Me₃P, InCl₃,2Me₃P, and Inl₃,2Me₃P is shown to result from the interaction of the appropriate halide with excess of trimethylphosphine. The vibrational spectra of these species are closely comparable with those of the related trimethylamine adducts.