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1 Polish Journal of Chemistry

1 2002

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Excited State Intramolecular Proton Transfer in 9-Oxo-9,10-dihydro-acridine-4-carboxylic Acid. photophysical and Computational studies

Sobczyk M., Szymańska A., Wiczk W., Łankiewicz L., Karolczak J., Rak J.

Polish Journal of Chemistry

2002

Vol. 76 / nr 9

1263-1269

9-Oxo-9,10-dihydro-acridine-4-carboxylic acid in both methanol and acetonitrile possesses a dual fluorescence and complex fluorescence intensity decay, whereas 9-oxo- 9,10-dihydro-acridine-2-carboxylic acid shows only one emission band and monoexponential fluorescence intensity decay. Theoretical calculations, using a semiempirical PM3 method, confirm, in the case of 9-oxo-9,10-dihydro-acridine-4-carboxylic acid, the excited state intramolecular proton transfer process from nitrogen atom to the oxygen of carbonyl of the carboxylic group.