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 l5N and l0B 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 µ-aminodiborane, H2NB2H5, and band assignments proposed.

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Merged jet copyrolysis of mixtures of Ar/BzH6 and Ar/HzS followed by trapping in a cryogenic matrix has led to the formation, isolation, and characterization of mercaptoborane, H2BSH. Eight of the nine fundamentals of this molecule were observed, including the boron-sulfur stretching mode at 804 cm-l ("B). Local density functional and normal-coordinate calculations were carried out to assist in assigning the observed fundamentals. The position of B-S stretching mode, compared to a range of known compounds, suggests single bond character for the B-S bond. Additional products were observed, including HBS, and suggests further reaction of HzBSH at high temperatures. A mechanism for the reaction is proposed.

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