Estimation of quantum yields of weak fluorescence from eosin Y dimers formed in aqueous solutions

We studied the weak fluorescence from the dimer of eosin Y (EY) in aqueous solutions. We used a newly developed ultrathin optical cell with a thickness ranging from of the order of microns to several hundreds of microns to successfully measure the fluorescence spectra of highly concentrated aqueous...

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Bibliographic Details
Published inPhotochemical & photobiological sciences Vol. 17; no. 6; pp. 793 - 799
Main Authors Enoki, Masami, Katoh, Ryuzi
Format Journal Article
LanguageEnglish
Published Cham Springer International Publishing 2018
Royal Society of Chemistry
Subjects
Aqueous solutions
Biochemistry
Biomaterials
Chemistry
Dimers
Fluorescence
Physical Chemistry
Plant Sciences
Reabsorption
Spectra
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Summary:We studied the weak fluorescence from the dimer of eosin Y (EY) in aqueous solutions. We used a newly developed ultrathin optical cell with a thickness ranging from of the order of microns to several hundreds of microns to successfully measure the fluorescence spectra of highly concentrated aqueous solutions of EY without artifacts caused by the reabsorption of fluorescence. The spectra we obtained were similar to the fluorescence spectrum of the EY monomer; almost no fluorescence was observed from the EY dimer. By a careful comparison of the spectra of solutions at low and high concentrations of EY, we succeeded in extracting the fluorescence spectrum of the EY dimer. The fluorescence quantum yield of the EY dimer was estimated to be 0.005.
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ISSN:1474-905X
1474-9092
DOI:10.1039/c7pp00465f