Knowledge Bank

The infrared absorption spectrum of $BI3$ has been studied from 2 to 25 microns in the solid, solution, and gas phases. One fundamental, and numerous combination, bands were observed. A corresponding study of $BBr3$ in the solution, pure liquid, and gas phases was made. A detailed analysis of the spectrum of $BBr3$. based on previously known Raman data, was carried out and all the $BBr3$ combination bands were assigned. The results of this analysis were applied to the $BI3$ spectrum. The observed spectrum of the latter is compatible with the expected planar configuration. Some techniques useful in the infrared study of these very highly reactive and hydroscopic compounds will be discussed.