Abstract
Solutions of tetracyanoethylene (TCNE) in 2-methyltetrahydrofuran (MTHF) glass containing a positive-charge scavenger (benzene or toluene) have been irradiated by UV light at 77 K by exciting only the TCNE-MTHF EDA complex. The photoinduced radical-anion formation from an ion-pair state (TCNE −…MTHF +) was found to be enhanced by adding the scavengers to the EDA system. From the measured quantum yield of the trapped TCNE − species, it may be concluded that positive-charge transfer takes place from MTHF + to a scavenger molecule when both species come into contact with each other.
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