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Photodegradation of rhodamine 6G dimers in silica sol–gel films

Paper ID Volume ID Publish Year Pages File Format Full-Text
27286 44014 2013 6 PDF Available
Title
Photodegradation of rhodamine 6G dimers in silica sol–gel films
Abstract

•Rhodamine 6G in silica sol–gel films forms dimers at high concentrations.•Different species of dimers, H-type and J-type, are observed.•The photodegradation of the different dimers has been studied.•The sandwich H-dimers degrade after head-to-tail fluorescent J-dimers.

The process of dimerization of rhodamine 6G at high concentrations in solution and when incorporated in a solid state matrix is well known but the dimer response to photodegration is still not well understood. Silica sol–gel films have been doped with rhodamine 6G with a concentration up to 10−1 M to form large amounts of dimers within the matrix. Fluorescence and UV absorption spectra have shown that both not-fluorescent H-dimers and fluorescent J-dimers together with the monomer form of rhodamine 6G are present in the matrix. Upon exposure up to 11 h to UV light a selective photodegradation of the different species has been finally observed. Analysis of the absorption spectra has shown that the H-type dimers are more resistant to photodegradation with respect to the J-type dimers.

Keywords
Rhodamine 6G; Photobleaching; Dye aggregates; Sol–gel; Film
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Photodegradation of rhodamine 6G dimers in silica sol–gel films
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 271, 1 November 2013, Pages 93–98
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
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Full-text PDF Download
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