Photodissociation of chalcogenides: Laser Flash Photolysis and product analysis study

ARGÜELLO, JUAN ELIAS; BARRIONUEVO, CECILIA ANDREA; BOUCHET, LYDIA MARIA; SCHMIDT, LUCIANA C; PEÑÉÑORY, ALICIA BEATRIZ

La Serena

Encuentro; X Encuentro Latinoamericano de Fotoquímica y Fotobiología (X ELAFOT); 2010

The photochemistry of thioetheres has been somewhat sparsely studied over the years; in general, aliphatic thioethers undergo homolytic dissociation, both in solution and in the gas phase. Photohomolysis of aryl thioeters may be followed by in-cage electron transfer to give an ion pair.1 Selenides and tellurides have been used as a source of ketones by irradiation in the presence of molecular oxygen.2 However, systematic investigation or basic data such as quantum yields measurement and kinetic information for chalcogenides are scarce at present. To broaden understanding of the photochemistry of the C-S or C-Se moiety, we present our results on the irradiation of a series of aryl diphenylmethyl sulfides and selenides, such as ArSCHPh2 and ArSeCHPh2. Electron-donating and electronwithdrawing groups were included in the aromatic ring for the sulfides, while for the selenides, phenyl, anisyl and naphthyl derivatives were studied.