Abstract
Abstract 2-Hydroxytriphenylmethanol (HM) shows photochromism in air-saturated acetonitrile and other solvents and also in the crystalline state. The colored form has been deduced to be o-fuchsone, produced by photochemical dehydration of HM. The photochromism mechanism is entirely different from that of other triarylmethane derivatives. The colored form is the same species as in thermochromism. The reactive state of HM was found to be the excited singlet state from the results of quenching experiments. The quantum yield of the photochemical reaction was determined to be 0.62 in acetonitrile by a method based on the equilibrium between the photochemical and thermal bleaching reactions. Photochromism occurs also at 77 K. At this temperature, HM radical is produced beside the colored form. The ratio of the concentration of HM radical to the colored form increases with irradiation time. Several HM derivatives show photochromism similar to HM.
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