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Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology

Reduction of isoviolanthrone by reaction with photogenerated radicals.


PMID 21713275

Abstract

The properties of isoviolanthrone (V(1)) and its corresponding dihydro form (V(1)-H(2)) in argon-saturated 1-phenylethanol in the presence of acetophenone were examined by photophysical and photochemical methods. Upon photolysis of the sensitizer, a radical-induced reduction of V(1) to V(1)-H(2) occurs. The quantum yield of this reduction is close to unity. The fluorescence of V(1) has a quantum yield of 0.08, for V(1)-H(2)Φ(f) is strongly enhanced and the emission maximum is blue-shifted. The ketyl radical, the semiquinone radical and V(1)-H(2) were observed in this sequence by flash photolysis. V(1)-H(2) is unstable and undergoes oxidation to V(1) on admission of oxygen.

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