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The absorption spectrum of a solid state film of anthraquinone derivative 1 differs significantly from that observed in solution and depends on the degree of film crystallinity. At room temperature, a solution of 1 exhibits weak fluorescence (φ f 0.001 in 2-propanol), but is totally non-emissive in aprotic solvents (e.g., in diethyl ether or chloroform). Stronger fluorescence can be observed...
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