A study has been made of the action of near‐ultraviolet and visible radiation on anaerobic solutions of 1‐ and 2‐piperidinoanthraquin‐ones in different organic solvents, and on polymer films dyed with these dyes. In the absence of oxygen, 1‐piperidinoanthraquinone is reduced to the anthrahydroquinone on irradiation in solution and on nylon films. Under similar conditions, 2‐piperidinoanthra‐quinone is reduced to the anthrone in organic solvents, but the photochemical changes are more complex on polymer films. 1‐Piperidinoanthraquinone doss not sensitise the photochemical degradation of nylon or cellulose acetate yarn. The results suggest that there is no definite relation between the ease of photoreduction of a dye and its ability to sensitise the photochemical degradation of textile fibres.
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Egerton et al. (1967) studied this question.
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