Photofading of Aminoanthraquinones by Visible Light in the Presence of Aliphatic Amines and Benzyl Halides

Abstract

The irreversible photofading of 1-aminoanthraquinones was found to be induced by the irra-diation of visible light in the presence of both aliphatic amines and benzyl halides (Tables 1, 2, Fig.1). The effect of oxygen on the photofading and kinetic studies (Figs. 3-5) suggested that the reaction was proceeded by the attack of benzyl halide on the reduced species such as radical anion or semiquinone radical of the quinones which were formed by amines in the reduction of the excited ³nπ* state of the aminoanthraquinones.