Fluorescence and Light Scattering Studies on the Interactions of 2-Hydroxy-3-Naphthoic Acid with Ionic and Nonionic Surfactants

DOI : http://dx.doi.org/10.13005/msri/030209

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The solublization of 2-hydroxy-3-naphthoic acid (2-H-3-NA) solubilizate into the micellar core of certain surfactants has been studied with the help of fluorescence spectroscopy. The various surfactants used for the study are nonionic as well as ionic ones. The nonionic surfactants are TX-100 and Brij-35 the anionics are DBSS and DSSS and two of the cationic surfactants are CPC and CTAB. The fluorescene peak height enhanced gradually on increasing the nonionic surfactant concentration, reaching to a limiting value with no shift in the peak position. A red shift occurred in the emission maxima in cationic surfactant media. The solubilization phenomenon was also confirmed by absorption spectral studies and light scattering measurements. Quantum yield measurements were made in these micellar media at different concentrations using anthracene as fluorescenece standard. Calculations were done for stokes? shift of 2-H-3-NA at different concentrations. The calculated results are in fair agreement with the experimental results. Environmental studies of the effect of nonaqueous solvent ethanol on the fluorescence spectra of the 2-H-3-NA compound were made. On increasing the ethanol concentration the fluorescence emission maxima showed enhancemant reaching a limiting value at its higher concentration. Thus, an understanding of the process of solubilization is expected to helps understanding the interplay of the different favourable and unfavourable forces guiding micellization.

Solubilization; Micellar media; Fluorescence and 2-H-3-NA