Theoretical study of the photochemistry of carbonyl compounds: Potential-energy surface for the photodissociation of propynal

P. Russegger, H. Lischka

Research output: Contribution to journalArticle

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Abstract

The potential-energy surface of propynal (HC≡C-CHO) pertinent to its dissociation to molecular products acetylene and CO, to radical formation H + HC≡C-CO, and rearrangement to various carbenes have been studied by means of ab initio calculations. A basis set of double-zeta quality and a more flexible basis set including polarization functions were employed. The various stationary points of the energy hypersurface were obtained by a complete optimization of the geometry. Extensive CI calculations were used to obtain the energies of transition states and minima. The lowest-energy barrier to molecular products is 70 kcal mol-1, and different in structure from the transition state of the similar reaction in formaldehyde. Characteristic features of the photodissociation of propynal are discussed.

Original languageEnglish
Pages (from-to)31-39
Number of pages9
JournalChemical Physics
Volume86
Issue number1-2
DOIs
StatePublished - 1984

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