Abstract
Various pyridine derivatives were found to be effective electron carriers in the photochemical hydrogen generating system consisting of ascorbic acid as a reproducible electron donor, zinc meso-tetra (4-hydroxysulphophenyl) porphyrin as a photocatalyst. and colloidal platinum. Among them the system using an N-alkyl-4, 4'-bipyridyl, especially the n-hexyl derivative (C 6Py +Py), was most effective, where the quantum yield for the hydrogen generation was 0.1 and the theoretical recycling number of the photocatalyst reached 100,000. The mechanism of the hydrogen generating reaction is discussed. Based on a number of standard experiments, C 6Py +Py is shown to be effective only in the specific combination with the present components.
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