Abstract
In the ground state, α-naphthol interacts with water via oxygen, whereas with alcohols (ethanol and isopropanol) and acetonitrile it interacts via hydrogen from the hydroxyl group. In the excited state, α-naphthol interacts much more weakly. An analysis of the dependences of positions of electronic-vibrational transitions on the solvent basicity and acidity demonstrates their nonlinearity. For the parameters describing the solvation ability of the solvent, linear dependences are observed for the following series of solvents: isopropanol, ethanol, acetonitrile, and water. The possible values of the acid number (pA*) for the excited α-naphthol molecule fall within the interval from 0.4 to 1.4 depending on the chosen maximum of the absorption band. In fluorescence spectra, the band intensities differ for neutral and ionic modifications of the molecule. The fluorescence efficiency of the neutral molecule is by an order of magnitude higher than that of the ionic modification. Possible channels of quenching of the ionic modification are discussed.
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Zharkova, O.M., Korolev, B.V. & Morozova, Y.P. Intermolecular Interactions. Absorption and Fluorescence Spectra of α-Naphthol. Russian Physics Journal 46, 68–74 (2003). https://doi.org/10.1023/A:1024056804352
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DOI: https://doi.org/10.1023/A:1024056804352