One- and two-photon photochemical stability of linear and branched fluorene derivatives

    Authors

    C. C. Corredor; K. D. Belfield; M. V. Bondar; O. V. Przhonska;S. Yao

    Comments

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    Abbreviated Journal Title

    J. Photochem. Photobiol. A-Chem.

    Keywords

    photodecomposition; two-photon absorption; photobleaching; fluorene; photostability; EXCITATION; ABSORPTION; PHOTOOXIDATION; CHROMOPHORES; Chemistry, Physical

    Abstract

    Photochemical decomposition of the fluorene derivatives, 4,4'-[[9,9-bis(ethyl)-9H-fluorene-2,7-diyl]di-2,1-ethenediyl]bis(N,N-diphenyl) benzeneamme (1) and 4,4',4"-[[9,9-bis(ethyl)-9H-fluorene-2,4,7-triyl]tri-2,1-ethenediyl]tris(N,N-diphenyl)benzeneamine (2), were investigated in pTHF under one- (UV-lamp) and two-photon (femtosecond laser) excitation. The quantum yields of the photoreactions were determined by absorption and fluorescence methods in air-saturated and deoxygenated solutions. The values of quantum yields were in the range (1.5-2.1) x 10(-6) for both types of irradiation, indicating that similar photobleaching processes occur under both one- and two-photon excitation. Deoxygenation of pTHF increased photostability of 1 and 2 by over an order of magnitude relative to air-saturated solutions. A cursory examination of some of the photochemical products (analyzed by HPLC and APCI-MS spectroscopy techniques) revealed an important role of ground state oxygen in the photoreactions, since no oxidation products were observed upon irradiation in the presence of the well know singlet oxygen sensitizer methylene blue. (c) 2006 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Photochemistry and Photobiology a-Chemistry

    Volume

    184

    Issue/Number

    1-2

    Publication Date

    1-1-2006

    Document Type

    Article

    Language

    English

    First Page

    105

    Last Page

    112

    WOS Identifier

    WOS:000243145200014

    ISSN

    1010-6030

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