The fluorescence spectra of 9-anthracenecarboxylic acid (9ACA) were studied in surfactant solutions of sodium
dodecyl sulfate and Triton X-100 as a function of surfactant concentration. In addition to an anthracene-like
sharp fluorescence, a broad fluorescence with a peak around 470 nm appeared at 330 nm excitation above
critical micellar concentrations. Only a broad fluorescence was seen at 400-nm excitation. Based on the
excitation and absorption spectra, the broad fluorescence is thought to be caused by hydrogen-bonded dimers
dissolved in the micelles. Intercalation of 9ACA was done for two alkylammonium-montmorillonites. The
fluorescence spectra of 9ACA showed a broad peak with increase in loading levels of 9ACA in the
alkylammonium-montmorillonites. The fluorescence was not similar to the excimer in a head-to-head
configuration with a maximum at 510 nm observed in the crystals, but rather to the broad one in the micelles.
Therefore, the hydrogen-bonded dimers are also attributed to the origin of the broad fluorescence in the
interlayer spaces.
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