Abstract
Interfacial electron transfer between a photoexcited semiconductor powder, suspended in water, and adsorbed substrates does not occur at emitting surface sites (shown schematically). Adsorption studies with a cyclic allyl ether (2,5-dihydrofuran) and zinc sulfide suggest that in a saturated solvent–solute monolayer all zinc sites are occupied by the substrate and that C–C coupling occurs between adsorbed radicals. The product quantum yield decreases linearly with increasing C–H bond dissociation energy calculated by ab initio methods.
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