Abstract
Freshly pepared CdS suspensions (CdS-0) consisting of quantised particles and their loose aggregates catalyse the photoreduction of 1-benzylnicotinamide (BNA+) in water under visible-light irradiation using triethylamine (TEA) as a sacrificial electron donor. Isomeric dimers of (BNA)2 are also found as one-electron reduction products from BNA+, whereas the photocatalysis of commercially available CdS powder (Aldrich, CdS-Ald) leads only to the formation of the dimers. The formation of cadmium metal (Cd0) on the lattice is indispensable for the photoformation of BNAH, suggesting that the eventual two-electron reduction on irradiation of CdS-0 with TEA in water, should proceed through hydrogen atom transfer from Cd0—H formed on the lattice of CdS-0.
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