The photochemistry of benz[de]anthracen-7-ones. Part III. Fluorescence quantum yield and continuous photolysis studies

Abstract

Fluorescence quantum yields are reported on benzanthrone and a range of its 3-, 4-, 6-, and 8-substituted derivatives in solvents of differing polarity. With benzanthrone and the 3-methoxy-derivative the quantum yields obtained in alcoholic solutions are in general higher than those in other solvents and this effect is discussed in the light of estimated potential energy levels and configurations of the lowest excited states. The continuous photolysis results are in accord with the configuration assignments and with earlier flash photolysis results on the same compounds.