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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Slyusareva E. A., Sizykh A. G., Gerasimova M. A., Slabko V. V., Myslivets S. A.
Заглавие : Laser photolysis of fluorone dyes in a chitosan matrix
Место публикации : Quantum Electron.: Turpion LTD, 2012. - Vol. 42, Is. 8. - P.687-692. - ISSN 1063-7818, DOI 10.1070/QE2012v042n08ABEH014860
Примечания : Cited References: 32
Предметные рубрики: POLY(VINYL ALCOHOL) MATRIX
XANTHENE DYES
ROSE-BENGAL
FLUORESCENCE PROPERTIES
DELAYED FLUORESCENCE
ORGANIC-MOLECULES
TRIPLET-STATE
EXCITATION
ABSORPTION
PHOSPHORESCENCE
Ключевые слова (''Своб.индексиров.''): laser photolysis--fluorescein--dibromofluorescein--eosin y--erythrosin b--rose bengal--chitosan--photobleaching kinetics--two-step absorption
Аннотация: Kinetics of laser-induced photobleaching of fluorone dyes (fluorescein, dibromofluorescein, eosin Y, erythrosin B, Rose Bengal) is studied in a chitosan matrix. For all dyes the bleaching kinetics at the intensities of laser radiation 0.7 — 11.9 W cm-2 demonstrates quasi-monomolecular behaviour. The results are analysed using a kinetic model, based on the four-level (S0, S1, T1, Tn) scheme of the dye with chemically active triplet states taken into account. It is shown that the rate constants of the chemical reaction involving higher triplet states in the dyes studied amount to (3.9 — 18.6) × 106 s-1 and exceed the analogous values for the reaction involving the first lower triplet states by nine orders of magnitude. The rate of reaction involving the first triplet states appeared to be higher by one — two orders of magnitude than that in the case of higher triplet states involved because of low population of the latter. The possible mechanism of dye bleaching with participation of chitosan that consists in reduction of the dye to the leuco form by transfer of hydrogen from the chitosan matrix is discussed.
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