Photodegradation of rhodamine 6G dimers in silica sol-gel films
Photodegradation of rhodamine 6G dimers in silica sol-gel films
复制标题
DOI：
10.1016/j.jphotochem.2013.08.007
复制
发表时间：
2013-11-01
影响因子：
4.3
通讯作者：
Innocenzi, Plinio
中科院分区：
文献类型：
--
作者：
Lasio, Barbara;Malfatti, Luca;Innocenzi, Plinio
罗丹明 6G 在高浓度溶液中以及掺入固态基质中时的二聚过程是众所周知的，但二聚体对光降解的响应仍不清楚。二氧化硅溶胶-凝胶薄膜中掺杂有浓度高达10(-1) M的罗丹明6G，在基质内形成大量二聚体。荧光和紫外吸收光谱表明，非荧光 H-二聚体和荧光 J-二聚体以及单体形式的罗丹明 6G 均存在于基质中。在紫外线照射长达 11 小时后，最终观察到不同物种的选择性光降解。吸收光谱分析表明，H 型二聚体比 J 型二聚体更能抵抗光降解。 (C) 2013 Elsevier B.V. 保留所有权利。
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. (C) 2013 Elsevier B.V. All rights reserved.