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Background: Ultrasonic speed and density parameters have been measured in binary and ternary systems containing complexes of copper surfactants (caprylate, caprate, and laurate) with 2-amino-6-methyl benzothiazolein 80 % and 40% benzene-methanol mixture at constant temperature using thermostatic water bath. Objective: From these values, the specific acoustic impedance Z, adiabatic compressibility β, intermolecular free length Lf, apparent molar compressibility φk, have been calculated. These parameters were used to know and compare the CMC value of the system observed by other physical parameters like apparent molar volume, viscosity, surface tension, etc. Method: Different plots were plotted and it has been observed that the synthesized molecule is acting as surfactant at particular concentrations CMC its behavior deviates. Result: The results have been explained on the basis of intermolecular interactions and indicate that there is sufficient solute–solvent interaction due to which micellar alignment is considerably affected. The decrease in adiabatic compressibility β and intermolecular free length Lf of the copper surfactant complex solution with increasing concentration of copper surfactant complex in 80% and 40% benzene−methanol has been observed which suggest that the non-polar long chains or lypophilic segment of the molecule in the solution are enveloped by a layer of solvent molecules bound and oriented towards lypophilic end. Conclusion: The orientation of the solvent molecules around the solutes may be due to the influence of electrostatic fields of solutes and results in the increase in the internal pressure and in lowering the compressibility of the solution i.e. the solution becomes harder to compress. Keywords: Copper, surfactants, ultrasonic, 2-amino-6-methyl benzothiazole, solute, solvent.
Sharma et al. (Thu,) studied this question.