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The energies of the charge-separated P+.Qstates of four amide-linked tetratolylporphyrin-benzoquinone (PQ) molecules in dichloromethane, taken as the difference in redox potentials for formation of P+.Q and PQ-, are 1.37 f 0.02 eV.

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The influence of fluoride ions on the photocurrent and photostationary state composition of the acid, aqueous iron-thionine system at bare and thioninecoated platinum electrodes was investigated. Observed photocurrents are in some circumstances increased by the addition of fluoride, in accordance with the theory of characteristic lengths of Albery et al. However, the Gibbs energy of the forward reaction, and hence the open-circuit voltage available from a differential photogalvanic cell, are sharply decreased.(15)