Abstract
The photoreduction of benzophenone by several substrates has been studied by time-resolved EPR. When cyclohexadiene, MTHF, and decane are employed as hydrogen donors to the excited triplet state of benzophenone the diphenyl ketyl radical which is produced exhibits emissive electron spin polarization with rise times on the order of a few microseconds. It is suggested that the experimental observations can be explained by intersystem crossing to a quartet state in the excited ketyl radical.
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