A photophysical study of 6‐propionyl‐2‐(N,N‐dimethylamino)naphthalene (PRODAN) in room‐temperature solutions under various conditions is reported. The results show no unusual photophysical properties, except for an extremely large solvatochromic shift of PRODAN fluorescence spectrum. The previously reported extra blue emission band for PRODAN in an aqueous solution is identified to be due entirely to trace water‐soluble impurities in the sample. The excited‐state dipole moment of PRODAN is determined based on solvatochromic results using a known twisted intramolecular charge transfer (TICT) molecule p‐(N,N‐diethylamino)ethylbenzoate (DEAEB) as a reference to probe specific solute‐solvent interactions. The possibility of TICT state formation in PRODAN is discussed, and a solvation equilibrium mechanism is proposed to account for the photophysical behavior of PRODAN.
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Bunker et al. (1993) studied this question.
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