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- W2094216520 abstract "Fluorescence from zinc porphyrins is quenched by methyl viologen in rigid media due to electron transfer. The volume of the quenching sphere depends upon the medium with the radius changing from 11.2 Å in ethanol at 80 K to 14.8 Å in decalinol at 298 K. These radii correspond to the average centre-to-centre separation distance at which the rate of electron transfer equals the rate of nonradiative decay of the singlet excited state of the porphyrin. Attaching the viologen to the porphyrin via a short, flexible chain leads to efficient fluorescence quenching, especially in rigid media where the porphyrin and viologen are held in quite close proximity (ca. 6 Å apart)." @default.
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- W2094216520 date "1984-09-01" @default.
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- W2094216520 title "The effect of separation distance on the fluorescence quenching for zinc porphyrin/viologen systems" @default.
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- W2094216520 doi "https://doi.org/10.1016/s0020-1693(00)83599-9" @default.
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