Abstract
A photo-responsive membrane has been prepared by casting an acetone solution of a spiropyran compound, phosphatidyl choline, and acetyl cellulose. Since the membrane showed excellent transparency in either the dry or wet state, absorption spectra of bound spiropyran were easily obtained. The membrane-bound spiropyran exhibited normal photochromism: a colored form under UV irradiation and a colorless form under visible irradiation p]The potential difference across the membrane was drastically changed by switching from visible light to UV light irradiation. This light-induced membrane potential change was reversible and was synchronized with a change in absorbance of the membrane-bound spiropyran at 533 nm. A change of membrane charge density associated with the photoisomerization of spiropyran is thought to cause this dynamic photo-response in membrane potential
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