also on the relative amounts of the two species present.Experimental Section 2-Naphthoic acid was obtained from Aldrich Chemical Co. at a purity of 99%. Material used in the fluorescence decay measurements was recrystallized from a 50% ethanol solution. Absolute ethanol (U.S. Industrial Chemical Corp.) and distilled water were used without further purification. All other chemicals were of reagent grade quality (Mallinckrodt Chemical Co.) and were used without further purification.Solutions were deaerated with nitrogen prior to spectral or decay measurements. Emission spectra were obtained with a Baird Atomic Model SF-1 fluorescence spectrometer. Quantum efficiency measurements were made with 2-naphthol as a standard for the free 2-naphthoic acid emission and quinine sulfate as a standard for the pro-
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