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

Lasio, Barbara and Malfatti, Luca and Innocenzi, Plinio (2013) Photodegradation of rhodamine 6G dimers in silica sol–gel films. Journal of Photochemistry and Photobiology. A: Chemistry, Vol. 271 , p. 93-98. ISSN 1010-6030. Article.

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DOI: 10.1016/j.jphotochem.2013.08.007

Abstract

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.

Item Type:Article
ID Code:9220
Status:Published
Refereed:Yes
Uncontrolled Keywords:Rhodamine 6G, photobleaching, dye aggregates, sol–gel, film
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Architettura, Design e Urbanistica
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Architettura, Design e Urbanistica > LMNT-Laboratorio di Scienza dei Materiali e NanoTecnologie
Publisher:Elsevier
ISSN:1010-6030
Deposited On:01 Oct 2013 09:16

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