An azobenzene-linked bis(15-crown-5) (1) was entrapped in the plasticized poly(vinyl chloride) (PVC) membranes in order to regulate their membrane potential by photoirradiation. The membrane potential changed synchronously with trans-cis isomerization of 1 by UV and visible light irradiation even when no concentration gradient of electrolyte existed between the two external solutions separated by the membrane. The results were explicated in terms of the formation of asymmetric membranes, i.e., the surface potential of the irradiated side of the membrane was different from that of the opposite side.
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Anzai et al. (1984) studied this question.
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