Abstract
The investigation of the acidic equilibrium of 5(p-dimethylaminobenzylidene)rhodanine (PDR) in aqueous micellar solution by a simple spectrophotometric method is reported. For this purpose, the effect of nonionic (brij-35 and TritonX-100), cationic (CTAB), and anionic (SDS) surfactants on the absorption spectra of PDR at different pH values was studied. The pKa of PDR in a different concentration of each surfactant was determined (27 °C). It was found that PDR is more dissociated in the presence of CTAB and the lowest dissociation is observed in SDS micellar media. These changes in pKa can be explained according to the electrostatic contribution of binding of the anionic form of PDR to the micellar pseudophase.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
