Infrared Spectrum of ν2 of Dibromoborane and Dibromoborane-d

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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).