Abstract
Light-induced redox reactions between zinc meso-tetraphenylporphyrin (ZnTPP) and alkyl viologens (C n V 2+) in organic solvent-surfactant-water solutions have been investigated as functions of (i) organic solvent content of solutions, (ii) surfactant charge, and (iii) alkyl viologen hydrophobicity. The best system appears to be an oil-in-water emulsion containing 5 × 10 −5 M ZnTPP and 10 −3 M C 10V 2+ stabilized by cationic surfactants (hexadecyltri-methylammonium bromide or chloride) with 6% N, N'-dimethylformamide (DMF), N, N'-dimethylacetamide (DMAC) or dimethyl sulfoxide (DMSO) in water.
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