Photo-excitable membranes. Photoinduced potential changes across poly(vinyl chloride)/spirobenzopyran membranes doped with valinomycin and nonactin.

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Poly(vinyl chloride)/spirobenzopyran membranes doped with valinomycin or nonactin were prepared to study the photoresponse of the membrane potential in the presence of K+ or NH4+ ion. Ultraviolet (UV) light irradiation induced more than 100 mV of potential change across the membrane doped with valinomycin in the presence of 10−8–10−6 M KCl, whereas the potential change was extremely suppressed in the presence of higher KCl concentration (>10−3 M). The photoresponse of the membrane potential depended upon the direction from which the membrane was irradiated. The nonactin-doped membranes showed a similar tendency in photoresponse in the presence of NH4Cl to that observed for the valinomycin-doped membrane in the presence of KCl. The results were explained in terms of surface potential changes at the irradiated surface of the membrane, associated with the photochemical reaction of spirobenzopyran and the specific adsorption of cations to the surface of the membrane.

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