Photophysics of thionine dye in aqueous and liposome media in presence of different reducing agents. |
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Authors: | B B Bhowmik S Basu A Sil S P Moulik |
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Institution: | Centre for Surface Science, Department of Chemistry, Jadavpur University, 700 032, Calcutta, India. cssju@yahoo.co.uk |
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Abstract: | 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. |
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