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Semiconductor Type A Photocatalysis: Role of Substrate Adsorption and the Nature of Photoreactive Surface Sites in Zinc Sulfide Catalyzed C–C Coupling Reactions
Author(s) -
Hörner Gerald,
Johne Petra,
Künneth Ronald,
Twardzik Günther,
Roth Henryette,
Clark Timothy,
Kisch Horst
Publication year - 1999
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/(sici)1521-3765(19990104)5:1<208::aid-chem208>3.0.co;2-0
Subject(s) - adsorption , chemistry , zinc , photochemistry , catalysis , photocatalysis , monolayer , dissociation (chemistry) , sulfide , zinc sulfide , radical , electron transfer , inorganic chemistry , organic chemistry , biochemistry
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.