On the fluorescence and photoreduction of methyl viologens
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 82 (5) , 869-876
- https://doi.org/10.1039/f29868200869
Abstract
The fluorescence of methyl viologen (MV2+) has been reinvestigated. The green emission has been attributed to impurities whose formation from MV2+ can be induced thermally or photochemically. One of the green fluorescent compounds has been found to act as an efficient photosensitizer for the reduction of MV2+ to MV+. In contrast to MV2+, the 1,1′,2,2′,6,6′-hexamethyl-4,4′-bipyridinium dication was found to be fluorescent. The fluorescence properties of 2,2′,6,6′-tetramethyl-4,4′-bipyridine and its protonated cations are also reported. The values of *pKa(S1) of a 4,4′-bipyridine have been obtained for the first time.Keywords
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