Mechanisms of Decomposition and Oxidation of Borane Compounds,
CORNELL UNIV ITHACA NY DEPT OF CHEMISTRY
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The rates of gas phase reactions between boranes B2H6 B5H9 B1OH14 and oxygen atoms 3P state were studied - 350K in a flow-tube reactor by determining time dependent levels of OH species, as functions of reactant concentrations. Quantitative fitting of these data for B2H6 and B5H9 led to mechanisms, and estimated rate constants, for the direct attack on the boranes, and for reactions of O3P with fragmentation products in particular, HBO and HBOH. A degradation sequence was established for each. Measurements via LIF of OH from B1OH14 were not completed our data show that under comparable conditions the deca produces -60 fold higher OH than does penta. Our QPMS diagnostic of a newly designed flow-tube system and revitalized mass-spectrometer permitted evaluation of a rate constant for the net destruction of B5H9, and qualitative estimates of relative concentrations of B5H9 fragmentation products.
- Organic Chemistry