The Temperature Dependence of Triplet State Reaction Rate and Quantum Yield for an Intramolecular Enone Photocycloaddition.

摘要

Valence photoisomerization (320-380 nm) of endo-tricyclo-deca-4, 8-diene-3-one has been studied as a function of temperature. At 4 - 51 the isomerization quantum yield is independent of temperature. In the same range the lifetime for the triplet state responsible for isomerization decreases. Arrhenius parameters for triplet decay are computed. A mechanism involving formation of a diradical intermediate which partitions to the valence isomers is suggested.