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Fluorescence quenching of eosin upon adsorption by colloidal silver mediated in aqueous solution and reverse Micelles
Author(s) -
Ling Zang,
Tao Shen
Publication year - 1996
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19960140406
Subject(s) - chemistry , eosin , micelle , aqueous solution , quenching (fluorescence) , eosin y , fluorescence , adsorption , photochemistry , colloid , particle (ecology) , catalysis , organic chemistry , photocatalysis , optics , staining , medicine , physics , pathology , oceanography , geology
The optical effects of the adsorption of eosin on the colloidal silver particle have been investigated in aqueous solutions. It was found that upon adsorption the fluorescence of eosin was effectively quenched. This was explained as the photoinduced interfacial electron transfer from the excited singlet state of eosin to the silver particle. Decreasing pH of the solution favors the adsorption of eosin and so enhances the fluorescence quenching. For comparison, the fluorescence quenching in reverse micelles was also investigated. The quenching behavior was much different from that mediated in aqueous solution. This was attributed to the unique microenvironment of reverse micelles.