Time-resolved resonance Raman spectroscopy of the triplet state and semi-reduced form of duroquinone

Abstract

Time-resolved resonance Raman spectra of duroquinone (DQ)(tetramethylbenzoquinone) in EtOH and 50/50 (EtOH–H₂O) mixtures have been obtained. Duroquinone was excited by 248 nm laser pumping, and a second probe laser was used to observe spectra at either 440 or 500 nm. Bands associated with three distinct transient species were observed, assignable to the triplet state, the neutral semiquinone radical and the semiquinone radical anion.