852999-75-8Relevant academic research and scientific papers
Reactions of pulsed-laser evaporated boron atoms with hydrogen. Infrared spectra of boron hydride intermediate species in solid argon
Tague Jr., Thomas J.,Andrews, Lester
, p. 4970 - 4976 (1994)
Pulsed-laser ablated B atoms react with H2 upon condensation with excess argon to give BH, a (H2)(BH) complex, and B2H6 as the major products. The initial reaction to form BH requires activation energy, and BH reacts with H2 to give additional products. Sharp new bands at 2587.3 and 1129.2 cm-1 exhibit natural isotopic 1:4 doublets for vibrations involving a single boron atom and disappear on annealing to 25 K. Substitution of 10B and D gives shifts that are matched by MBPT(2) calculations of vibrational spectra for planar BH3. Broader bands at 2475.2 and 1134.3 cm-1 exhibit similar isotopic shifts for vibrations of a BH3 submolecule and decrease on annealing to 25 K. The displacements from isolated BH3 frequencies suggest a (H2)(BH3) complex and are in general agreement with recent quantum chemical calculations for BH5. A sharp 2679.9-cm-1 band gives the 10B shift predicted by MBPT(2) calculations for linear HBBH. A weak 2212.8-cm-1 band exhibits the 10B shift and frequency calculated for the strongest band of BH4-. Additional broad absorptions that remain on annealing are attributed to higher boranes.
