The prodan molecule (6-propionyl-2-dimethylamino naphthalene) – fluorescence probe – is investigated by quantum-chemical methods of intermediate neglect of differential overlap (INDO) and molecular electrostatic potential (MEP). The dipole moments of the ground and excited states, the nature and position of energy levels, the centers of specific solvation, the rate constants of photoprocesses, and the fluorescence quantum yield are estimated. To elucidate the role of the dimethylamino group in the formation of bands and spectral characteristics, the molecule only with the propionyl group (pron) is investigated. The long-wavelength absorption bands of prodan and pron molecules are interpreted. The results obtained for the prodan molecule by the INDO method with original spectroscopic parameterization are compared with the literature data obtained by the DFT/CIS, ZINDO/S, and AM1/CISD methods.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 25–32, April, 2012.
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Titova, T.Y., Morozova, Y.P., Zharkova, O.M. et al. Quantum-chemical investigations of spectroscopic properties of a fluorescence probe. Russ Phys J 55, 369–377 (2012). https://doi.org/10.1007/s11182-012-9821-6
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DOI: https://doi.org/10.1007/s11182-012-9821-6