Specific electron transfer mechanism from the photoexcited tetrasulfonated Zn(II)-tetraphenylporphyrin to methylviologen via self-assembled ionic complex |
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| Authors: | M Kaneko K Suzuki Esther Ebel Dieter Wöhrle |
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| Institution: | 1. Faculty of Science, Ibaraki University, Mito, 310-8512 Japan;2. Department of Biology/Chemistry, University of Bremen, Bremen, 28359 Germany |
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| Abstract: | Electron transfer from photoexcited tetrasulfonated Zn(II)-tetraphenylporphyrin (ZnTSTPP) to methyviologen (MV2+) was studied. From the investigation of relative fluorescence intensity and emission lifetime against the MV2+ concentration, it was concluded that the electron transfer takes place by a static mechanism. Based on the analysis of the quenching behavior, it was concluded that the static reaction did not follow an ordinary Perrin model, but interaction of the donor (photoexcited Zn-TSTPP) and the acceptor (MV2+) molecules, ionic interaction in the present case, is responsible. The analysis of the quenching gave the equilibrium constant for the interaction to be K = 6.5 × 104 M−1. A two-dimensional selfassembled macromolecular ionic complex between ZnTSTPP and MV2+ is proposed. |
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| Keywords: | electron transfer methylviologen static mechanism tetrasulfonated tetraphenylporphyrin-zinc complex |
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