The problem of triplet self-quenching in thioketone photochemistry

V. Ramesh, N. Ramnath, V. Ramamurthy

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19 Scopus citations


The highly efficient quenching of the thioketone triplet state by ground state thioketones with various electronic and structural features was investigated by means of phosphorescence quenching measurements in a number of solvents. Electron-withdrawing groups conjugated to the thioketone chromophore and steric crowding around the lone pair of electrons on the sulphur atom tend to decrease the quenching rate. The ground state thioketone quencher acts as the donor and the excited thioketone phosphorescer acts as the acceptor in the quenching process. Possible involvement of triplet excimers was investigated but no excimer or heteroexcimer emission was observed.

Original languageEnglish (US)
Pages (from-to)141-148
Number of pages8
JournalJournal of Photochemistry
Issue number2
StatePublished - 1983
Externally publishedYes


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