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Spectral and photophysical properties of 3-hydroxy-2-naphthoic acid (3HNA) have been investigated experimentally and theoretically. In addition to its normal fluorescence, 3HNA exhibits a large Stokes-shifted emission that depends on its concentration, the nature of the solvent, pH, temperature and excitation wavelength. 3HNA seems to form different emitting species in different media. The large Stokes...
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