Photophysics of thionine dye in aqueous and liposome media in presence of different reducing agents.
The photoelectrochemical and spectral (both absorption and fluorescence) studies of thionine, a cationic phenothiazine dye, have been carried out in aqueous and phosphatidylcholine liposome media in the presence of different reducing agents, such as I(-), Br(-), Cl(-) and Fe(2+). The results show that the photovoltage generation from photoelectrochemical studies and Stern-Volmer quenching constant studied by fluorescence quenching support the photoinduced electron transfer from the reducing agent to the singlet excited thionine dye. Moreover, a good correlation between photovoltages/Stern-Volmer quenching constants vs. reduction potentials of the reducing agents also confirms the above electron transfer in the photoexcited state.
Bhowmik
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Centre for Surface Science, Department of Chemistry, Jadavpur University, 700 032, Calcutta, India. cssju@yahoo.co.uk
Basu
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Sil
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Moulik
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D008081:Liposomes; D010640:Phenothiazines / Q000737:chemistry*; D010777:Photochemistry; D019163:Reducing Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D017967:Zinc Compounds / Q000737:chemistry*
D008081:Liposomes; D010640:Phenothiazines; D019163:Reducing Agents; D017967:Zinc Compounds; D014867:Water; C026187:thionine blue