11 超音波同時照射による2-プロパノールの光化学反応の加速効果

概要

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The possibility of double excitation of ultrasound and UV light is examined in a homogeneous reaction system, without the intervention of such physical effects as cleaning of the solid surface. We had already reported that simultaneous irradiation of ultrasound accelerated the rate of the photochemical disappearance of 4,4'-dihalogenated benzils depending on their substituents. In this work, photochemical reaction of iso-propanol was studied using low-pressure mercury lamp (Fig.1). When UV light and ultrasound were simultaneously irradiated into iso-propanol, the rate of photochemical production of pinacol were accelerated as shown in Fig.2. Since pinacol is known to be produced by dimerization of the radical, (CH_3)_2(OH)C・, the acceleration is ascribed to the increase of collision frequency between the radicals. Ultrasonic irradiation might enhance the collision frequency through the acceleration of mass transportation. This result suggests that simultaneous irradiation of ultrasound can substantially affect the other types of bimolecular photochemical reactions.
日本ソノケミストリー学会の論文