The lowest triplet states of anthraquinone and chloroanthraquinones: The 1-chloro, 2-chloro, 1,5-dichloro, and 1,8-dichloro compounds

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Abstract
From the measurements of phosphorescencespectra and triplet–triplet absorptions of the title compounds, it has been proposed that the lowest triplet states (T 1) of the α‐chloro compounds are of mixed nπ*–ππ* or ππ* character, while the nπ* triplet states are the lowest ones for anthraquinone and 2‐chloroanthraquinone (the β‐chloro compound). Compared with anthraquinone and the β‐chloro compound, much shorter lifetimes of the T 1 states and small phosphorescence quantum yields were obtained for the α‐chloro compounds. These results have been interpreted in terms of the modification of the geometrical molecular structure by the interaction of the carbonyl group with chlorine atom(s) at the α position(s), causing the T 1 states to be of ππ* character with short lifetimes.

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