Triplet formation in aminoanthraquinones and its importance for the catalytic fading of dye mixtures

Autor:	H.-U. Borst, J. Kelemen, Horst E. A. Kramer, Jürgen Fabian, M. Nepras̆
Rok vydání:	1992
Předmět:	Singlet oxygen General Chemical Engineering General Physics and Astronomy Quantum yield General Chemistry Photochemistry Fluorescence Toluene Anthraquinone Catalysis chemistry.chemical_compound Reaction rate constant chemistry Physics::Chemical Physics Triplet state
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 69:97-107
ISSN:	1010-6030
DOI:	10.1016/1010-6030(92)85266-w
Popis:	The catalytic fading of yellow azo dyes in an admixture with blue, red or violet anthraquinone dyes is due to a type II photo-oxygenation during which singlet oxygen is produced by the anthraquinone dye in its triplet state. The triplet quantum yields (which are of decisive importance in the extent of catalytic fading) of all monoaminoanthraquinone and diaminoanthraquinone isomers (model compounds for technical dyestuffs) were measured in toluene. The rate constants of the radiationless deactivation ( k IC ) and of the triplet formation ( k ISC ) were determined from the fluorescence quantum yield, the fluorescence lifetime and the triplet quantum yield. The rate constants of triplet formation ( k ISC ) depend strongly on the position of the substituents and are related to the singlet—triplet separation energies of the excited singlet and triplet states ( E s1 - E T1 ).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fec5fd89569f3943e4ddec5fa8079c12 https://doi.org/10.1016/1010-6030(92)85266-w Zobrazit plný text záznamu