Mechanisms of photoinduced protolytic interactions of 2,5-diphenyloxazoleortho-hydroxy derivatives in media of various acidities

Autor:	E. A. Posokhov, A. D. Doroshenko
Rok vydání:	2000
Předmět:	chemistry.chemical_compound Reaction rate constant chemistry Intermolecular force Cationic polymerization Protonation Physical and Theoretical Chemistry Photochemistry Equilibrium constant Dissociation (chemistry) Oxazole Aqueous alcohol
Zdroj:	High Energy Chemistry. 34:93-100
ISSN:	1608-3148 0018-1439
DOI:	10.1007/bf02761836
Popis:	The mechanism of photoinduced intra- and intermolecular protolytic interactions ofortho-hydroxy derivatives of 2,5-diphenyloxazole in an aqueous alcohol medium was studied over a wide range of acidity from pH ∼13 toH 0 of ∼−7. The spectral parameters of protolytic forms and equilibrium constants were obtained, and rate constants for the primary photochemical processes (excited-state intra- and intermolecular proton transfer reactions) were evaluated. It was shown that the spectral characteristics of oxazoleortho-hydroxy derivatives in an acidic medium are formed as a result of competition and interchange of intra- and intermolecular protolytic interactions. The phototautomeric form in strongly acidic solutions was found to be produced by dissociation of the cationic form with the protonated oxazole ring.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::053ae74112894b5dc279a2b84ade495f https://doi.org/10.1007/bf02761836 Zobrazit plný text záznamu Full text from SpringerLink