Interactions between nitrophenylhydrazinium chloride and surfactants in aqueous solutions

In the present study, the interaction of p-nitrophenylhydrazinium chloride (Nphh) with sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB) and Triton X-100 (TX-100) in aqueous solutions have been investigated by means of UV-Vis spectroscopy. Interactions between Nphh and surfactants (CTAB and TX100) around their critical micelle concentration (CMC) did not show any spectral shifts. At surfactant concentration above 0.01 M, a red-shifted absorption band appeared in the spectra of the Nphh molecule. On the other hand, a blue-shifted absorption band appeared at low SDS conceniration (ca. 0.002 M). The appearance of a red-shifted absorption band occurred at SDS concentration above 0.05 M. Electrostatic, charge transfer and hydrogen bonding interactions play an important role in the growth of red-shifted and blue-shifted absorption bands in the spectra of Nphh molecule.