The nature of the active states during photochemical reactions of anthraquinone dyes with alcohols

It was established that addition of anthracene or naphthalene reduced the luminescence intensity of anthraquinone dyes, observed during their photoreaction with alcohols (fluorescence of their hydrogenated products). It was shown that this effect was linked with excitation energy migration from the dyes to the additives at the triplet levels. It was concluded that during photohydrogenation the triplet state of weak as well as strong anthraquinone sensitizers was active.