Thermal Decay of the Colored Form in Photochromism of 2-Hydroxy-4-methoxytriphenylmethanol in n-Hexane

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It was found that, like 2-hydroxytriphenylmethanol (HM), 2-hydroxy-4-methoxytriphenylmethanol (HMM) shows photochromism as well as thermochromism. Photo- and thermochromism of HMM occur even in n-hexane, in which a photochemical irreversible reaction occurs for HM. In n-hexane solution of HMM, a three-stage thermal fading pattern was observed at room temperature and at lower temperatures, the pattern becoming a one-stage type at a higher temperature. Mechanical stirring of a sample solution caused a decrease in the concentration of the colored form in n-hexane at room and lower temperatures but not at a higher temperature. These phenomena are caused by the backward reaction on the wall of a sample cell including diffusion as the rate-determining step. In n-hexane–dimethoxyethane (or acetonitrile) mixed solvents, the first-order rate constant becomes smaller with increase in the dimethoxyethane (or acetonitrile) concentration. From a certain concentration, shaking of a cell causes no decrease in the concentration of the colored form.
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