EXCIMER EMISSION OF PYRENE DERIVATIVES INDUCED BY IONIC DETERGENTS BELOW THE CRITICAL MICELLE CONCENTRATION

被引：20

作者：

BERTOLOTTI, SG ^{[1
]}

ZIMERMAN, OE ^{[1
]}

COSA, JJ ^{[1
]}

PREVITALI, CM ^{[1
]}

机构：

[1] UNIV NACL RIO CUARTO,DEPT QUIM,RA-5800 RIO CUARTO,ARGENTINA

来源：

JOURNAL OF LUMINESCENCE | 1993年 / 55卷 / 02期

关键词：

D O I：

10.1016/0022-2313(93)90015-F

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The fluorescence of three ionic pyrene derivatives in the presence of CTAC and SDS was investigated at detergent concentrations below the critical micelle concentration (CMC). The characteristic excimer emission was observed for surfactant concentrations more than one order of magnitude lower than the CMC. Lifetime measurements show that excimer formation must be via a static mechanism. This is explained by the formation of mixed premicellar aggregates between the surfactants and the probes. The quenching of the excimer emission by ionic (Tl+, S2O32-) and neutral (N,N-dimethylaniline, fumaronitrile) species was studied. The quenching is only effective when the ions are of opposite charge to that of the detergent. The quenching by neutral species can be explained by a static mechanism which involves the association of the quencher with the aggregates.

引用

页码：105 / 113

页数：9

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