Abstract
The solid state photoenolizations of 2,4,5-trimethylbenzaldehyde, 2,4- and 2,5-dimethylbenzaldehydes in a durene single crystal have been investigated as a function of light intensity and of temperature. The data show that photoenolization of these guests is a monophotonic process. Arrhenius plots for the overall reaction observed from the three guests show two distinct linear regions with change in slope within a narrow temperature region. Different temperature dependent processes which might be involved in the solid state photoenolization reaction of these guests in durene are discussed. The non-resolved character of the well polarized absorption of the photoenol in the durene single crystal at 10 K is indicative of the dissociative nature of its first excited singlet state. It is proposed that the photoenol is initially formed in its triplet state.
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