Trudel Simon, Gilson Denis F R
Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC, H3A 2K6 Canada.
Inorg Chem. 2003 Apr 21;42(8):2814-6. doi: 10.1021/ic026275s.
The Raman spectra of the ammonia-borane complex, NH(3)BH(3), have been investigated as a function of pressure up to 40 kbar. Vibrational modes involving the NH(3) group show negative pressure dependences, supporting the existence of the dihydrogen bond, but the vibrations of the BH(3) group have a positive dependence. Two transitions were observed in the solid phase under pressure, in contrast to the temperature behavior, where a single transition occurs. Factor group splitting occurs for the degenerate vibrations, and this allows the correct assignment of the observed vibrations.
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