Abstract
Bilayer phosphatidylserine membranes sensitized by zinc tetraphenylporphyrin (ZnTPP) and its 1-(CH 2) 2 CO 2H derivative (ZnTPP-Ac) are formed between one oxidant (Fe 3+) and one reductant (ascorbic acid) solution. Under visible light illumination steady state photocurrents are recorded. The acidic derivative, probably due to its better interfacial location, is 30 times as efficient as ZnTPP. Linear relationships are observed between the inverse of the stationary photocurrent and the following functions: 1/[A]; 1/ E and exp (−0.3 fU); [A] being the electron acceptor concentration; E, the light intensity and U, the external applied voltage. A model based on a translocation of the oxidized ZnTPP-Ac accounts for these experimental relationships.
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