INFRARED MATRIX-ISOLATION CHARACTERIZATION OF AMINOBORANE AND RELATED-COMPOUNDS

The reaction products arising from the high-temperature pyrolysis of mixtures of B2H6 and NH3 in argon have been isolated and characterized in low-temperature matrices. All 11 infrared active fundamentals of aminoborane, H2B = NH2, were identified and N-15 and B-10 counterparts located for most of the fundamentals. The two lowest frequency fundamentals were observed for the first time. Based on isotopic shifts and a normal-coordinate calculation, reassignment of several of the previously observed gas-phase fundamentals is suggested. Spectra were also obtained of [H2B(NH3)2] + [BH4]- and mu-aminodiborane, H2NB2H5, and band assignments proposed.