Abstract
Laser pulse excitation of decafluorobenzophenone (DFB) in acetonitrile yields the triplet 3 DFB after rapid intersystem crossing from the singlet 1 DFB. The triplet has absorption maxima at 310 and 490 nm. 3 DFB abstracts hydrogen from donors such as alkanes and alcohols in a radical-like mechanism to yield ketyl radical. The rate constant k q is 10-40 times higher than that of the triplet benzophenone 3 BP. Ketyl radical (DFBH) has absorption maxima at 320 and 530 nm. In aqueous solution, the ketyl radical has a pK a =6.9, and the anion has maxima at 335 and 630 nm
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