Photochemical properties of (7-benzothiazol-2-yl-9, 9-didecylfluoren-2-yl)diphenylamine under one- and two-photon excitation

    Authors

    K. D. Belfield; M. V. Bondar; O. V. Przhonska;K. J. Schafer

    Comments

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    Abbreviated Journal Title

    J. Photochem. Photobiol. A-Chem.

    Keywords

    fluorene derivatives; photochemical quantum yield; two-photon; excitation; photostability; photodecomposition; ABSORBING FLUORENE DERIVATIVES; 5, 7-DIMETHOXYCOUMARIN; Chemistry, Physical

    Abstract

    The photochemical properties of the fluorene derivative (7-benzothiazol-2-yl-9,9-didecylfluoren-2-yl)diphenylamine (1) in hexane and CH2Cl2 were studied under linear (one-photon) and nonlinear (two-photon) excitation. The quantum yield of the photochemical reaction, 0, for 1 in hexane was in the range (3.5-5) x 10(-5) for one-photon excitation (UVGL-25 and Xe-lamps) and was nearly the same under two-photon excitation (femtosecond laser with pulse duration 120 fs, average power similar to10 mW, repetition rate f = 1 kHz). The values of in CH2Cl2 were (2.5-4) x 10(-5) for one-photon excitation and increased 50-80 times under two-photon excitation. This increase can be explained by an additional one-photon absorption process from the first electronically excited state, resulting in the observed enhancement in photochemical decomposition. (C) 2004 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Photochemistry and Photobiology a-Chemistry

    Volume

    162

    Issue/Number

    2-3

    Publication Date

    1-1-2004

    Document Type

    Article

    Language

    English

    First Page

    569

    Last Page

    574

    WOS Identifier

    WOS:000220468500042

    ISSN

    1010-6030

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