Abstract
A spectroscopic study has been made of flame gases from trimethyl-borate flames. Measurements have been made of OH concentrations, relative HBO2 concentrations and the emission and absorption in the strong 5470band of the “boric oxide fluctuation” band system. OH has been found to behave as in the absence of boron. HBO2 is formed in nearly its equilibrium amount soon after the gases come from the flame. The behavior of the 5470 band in absorption is shown to be inconsistent with its assignment to B2O3, and the proportionality of this absorption to the OH concentration has led to the suggestion that this band system is due to the free radical BO2. From measurements over a range of temperatures, the heat of formation of BO2 was found to be about−84 kcal/mole, and these and other data suggest that whereas the concentration of BO2 is never very high, it is a molecule of some importance in both the chemistry and thermodynamics of the H-B-O system at elevated temperatures.
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