Title

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

Authors

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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