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Laser Flash Photolysis of Chloranil in Solution
Author(s) -
GuerryButty Elisabeth,
Haselbach Edwin,
Pasquier Cécile,
Suppan Paul,
Phillips David
Publication year - 1985
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19850680413
Subject(s) - chemistry , flash photolysis , chloranil , acetonitrile , singlet state , ultrafast laser spectroscopy , photochemistry , reaction rate constant , laser , absorption (acoustics) , analytical chemistry (journal) , kinetics , atomic physics , excited state , organic chemistry , optics , physics , quantum mechanics
Chloranil (2,3,5,6‐tetrachloro‐2,5‐cyclohexadiene‐1,4‐dione; C ) in deoxygenated acetonitrile shows transient absorptions which are assigned to the radical anion \documentclass{article}\pagestyle{empty}\begin{document}$ \rm {C}^{- \kern-4pt {.}} $\end{document} and to the triplet 3 C *. The absorption due to \documentclass{article}\pagestyle{empty}\begin{document}$ \rm {C}^{- \kern-4pt {.}} $\end{document} rises ‘instantly’ during the 12 ns laser flash and then more gradually in a time of μs. This observation is explained as electron capture from neat acetonitrile by photoexcited C taking place from both its singlet and triplet states with rate constants estimated as 10 9 and 10 4 s −1 M −1 , respectively.