Infrared Spectrum of ν2 of Dibromoborane and Dibromoborane-d

Abstract

The fundamental associated with the B–H and B—D stretching motions in HBBr₂ and DBBr₂ have been observed under high resolution. A series of evenly spaced lines occurs which has the appearance of a ⊥ band of a symmetric‐top molecule. Analysis of the spectra gives an approximate value for the smallest moment of inertia from which the apex angle Br–B–Br was calculated to be 119.3±2°. It was possible to assign K values to the individual lines and to determine the position of the band centers for both HBBr₂ (2622.4 cm^—1) and DBBr₂ (1960.1 cm^—1).