Knowledge Bank

“The infrared spectra of $B2H2D$ and $B2DhH$ are reported. In a sample of partially deuterated diborane there are twenty-one different species, represented by seven molecular formulas ranging from $B2H6$ to $B2H6$. These exist in equilibrium with one another and cannot be separated by chemical or physical means. However, spectra of individual formula-groups can be obtained by compensating for the spectra of other species. Such techniques are discussed in detail. Prominent infrared bands for $B2H5D$ appear at ca. 938, 956, 1080, 1250, 1600, 1720, 1900 and $2550cm-1$; and for $B2D5H$, at ca. 718, 730, 875, 900, 1075, 1200, 1450, 1700, 1860, 1950 and $2550cm-1$. Spectral information obtained from the partially deuterated diboranes is utilized in assigning the observed bands of monomethyldiborane and three deuteroderivatives ($CHaB2D2$, $CDaB2H5$ and $CDaB2D5$ to characteristic bond vibrations.”