Abstract
The Gaussian-2 (G2) theoretical procedure, based on ab initio molecular orbital theory, is used to calculate the energies of CH3OF, CH3OF+, and related compounds. In this study we have found methyl hypofluorite to have a trans Cs structure and to be stable with respect to loss of fluorine by 45.9 kcal/mol. The energies of fragmentation processes of methyl hypofluorite calculated from G2 theory are in agreement with those measured by Ruscic, Appelman, and Berkowitz [J. Chem. Phys. 95, XXX (1991)] and support their interpretation of the photoionization data. The theoretical enthalpy of formation ΔH0f0(CH3OF) of −21.0 kcal/mol is in agreement with the experimental value (≥−23.0±0.7 kcal/mol) derived from the photoionization data. The ordering of the O–F bond strengths in the series of molecules OF, HOF, and CH3OF is OF>HOF>CH3OF and the C–O bond strength is 6–8 kcal/mol weaker in methyl hypofluorite than in methanol.
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