Identification of oblique and coplanar inclined fluorescent J-dimers in rhodamine 110 doped sol-gel-glasses

被引：40

作者：

del Monte, F ^{[1
]}

Levy, D ^{[1
]}

机构：

[1] CSIC, Inst Ciencia Mat, E-28049 Madrid, Spain

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 38期

关键词：

D O I：

10.1021/jp991491g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Rhodamine 110 (R110) fluorescent J-dimers have been first observed in doped silica gel-glasses made by sol-gel process. The R110 doped gel-glasses photophysical properties such as excitation/fluorescence spectra and lifetimes were studied in a wide range of dye concentrations. It has been determined that the formation of R110 dimers is a consequence of the dye adsorption on the porous surface of the gel-glasses. The adsorption geometry, which is established by the angle formed between the longitudinal axis of the molecule and the gel surface, determined the formation of either R110 fluorescent J-dimers or nonfluonscent H-dimers. Since the adsorption angle was related to the dye concentration, the transition from J-dimers to II-dimers was found for a specific R110 concentration. Formation of J-dimers with a preferential oblique or coplanar inclined configuration was induced by the change of the polar character of the adsorption surface.

引用

页码：8080 / 8086

页数：7

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