Abstract
The transient free radicals formed when furil was photoreduced have been characterized by esr and CIDEP. Two furil derived radicals were observed: one was the protonated form of the semidione radical (FH•) while the other was an allyl radical formed by radical addition to the furil ring. Initial polarization was observed for FH• which was consistent with the triplet mechanism and these CIDEP results indicate that phenol is a better chemical quencher of the furil triplet than pentachlorophenol which is in turn more efficient than 2-propanol. A method to estimate relative T1 of radicals is also described.
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