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

Paper ID Volume ID Publish Year Pages File Format Full-Text
28584 44081 2006 8 PDF Available
Title
One- and two-photon photochemical stability of linear and branched fluorene derivatives
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)benzeneamine (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) × 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.

Keywords
Photodecomposition; Two-photon absorption; Photobleaching; Fluorene photostability
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One- and two-photon photochemical stability of linear and branched fluorene derivatives
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 184, Issues 1–2, 15 November 2006, Pages 105–112
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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