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The phototautomerism of 5-deazalumichrome was studied in 1,2-dichloroethane in the presence of acetic acid. In comparison with 3-methyllumichrome, 5-deazalumichrome undergoes excited state proton transfer with higher efficiency, manifested by its fluorescence spectrum and lifetimes. The replacement of N-5 by carbon in the pyrazine ring of alloxazine restricts the electron density redistribution...
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