Quantitative study of the photostability of spiropyrans

Autor:	Vladimir A. Kuzmin, T. B. Krasieva, Ya. N. Malkin
Rok vydání:	1990
Předmět:	Spiropyran Absorption spectroscopy General Chemical Engineering General Physics and Astronomy Quantum yield General Chemistry Chromophore Photochemistry Dithiolane Solvent chemistry.chemical_compound Photochromism chemistry Impurity Moiety Triplet state Photodegradation
Zdroj:	Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 39:236-243
ISSN:	1573-9171 0568-5230
DOI:	10.1007/bf00960644
Popis:	The method of determination of the quantum yields of the irreversible photodegradation of photochromic spiropyran solutions is discussed. The proposed method is based on the simultaneous determination of the concentration of the spirocyclic form using pulsed photolysis (by formation of photoinduced form B) and absorption spectra of the products. Photodegradation occurs during the action of a continuous source of monochromatic light. Quantum yields of photodegradation ϕc for 63 spiropyrans from five different classes (differing in heterocyclic moiety) are determined. For all the compounds studied the ϕc value is affected by the structure of the benzochromene moiety in the molecule (with the exception of the dithiolane series). It is considered that the photodegradation of spiropyran is caused by the interactions between the solvent and the isomer of the coloured 3X form of spiropyran.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd3542f74918938a288246fbe15c5c87 https://doi.org/10.1007/bf00960644 Zobrazit plný text záznamu Full text from SpringerLink