Energy transfer from rhodamine 6G to thionine in an anionic microemulsion

Autor:	Wen-Chao Lai, Raymond A. Mackay
Rok vydání:	2005
Předmět:	Rhodamine 6G Rhodamine chemistry.chemical_compound Range (particle radiation) Colloid and Surface Chemistry Förster resonance energy transfer Reaction rate constant Chemistry Microemulsion Photochemistry Acceptor Thionine
Zdroj:	Colloids and Surfaces A: Physicochemical and Engineering Aspects. 254:115-123
ISSN:	0927-7757
DOI:	10.1016/j.colsurfa.2004.04.062
Popis:	The transfer of electronic excitation energy from rhodamine 6G as an energy donor to thionine as an acceptor has been studied in anionic microemulsion by the method of fluorescence quenching and sensitization. The concentrations of both donor and acceptor used in this study are quite high, in the range of 10−3 M. Both radiative and nonradiative processes have been taken into account, with the major contribution coming from the nonradiative path. An energy transfer efficiency up to 50% has been observed, and the rate constant of the nonradiative energy transfer from rhodamine 6G to monomeric thionine is 5 × 1011 M−1 s−1. This indicates that the nonradiative energy transfer belongs to the long-range Forster-type of dipole–dipole interaction. The results also show why the efficiency of a photogalvanic cell based on the thionine–iron system in anionic microemulsion is enhanced by the incorporation of an auxiliary absorber.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5de2d509fe3f56de72564b7d7c5ba5b1 https://doi.org/10.1016/j.colsurfa.2004.04.062 Zobrazit plný text záznamu Full Text from ScienceDirect