H. Gruen, H. Görner
Oct 1, 2011
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Journal
Photochemical & Photobiological Sciences
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.