Vibration Spectra of Some Mixed Halides of Boron

Abstract

Mixed halides of boron have been shown to exist in binary mixtures of the trihalides. Most of the fundamental frequencies of BF2Cl, BFCl2, BF2Br, BFBr2, BCl2Br, and BClBr2 for molecules containing boron-10 and boron-11 have been observed and assigned to the proper modes of vibration. With the aid of the trihalide frequencies a normal coordinate treatment has been made for the mixed halides. Some discussion of the validity of transferring force constants in this system has been given.