Acoustic Parameters and Studies of Complexes Containing Copper Surfactants with Substituted 2-Amino-6-Chloro Benzothiazole

Ultrasonic speed and density parameters have been measured in binary and ternary systems containing complexes of copper surfactants (caprylate, caprate, and laurate) with substituted 2-amino-6-chloro benzothiazole in 80% and 40% benzene-methanol mixture at constant temperature using thermostatic water bath. From these values, the specific acoustic impedance Z, adiabatic compressibility , intermolecular free length L_f, apparent molar compressibility φk, have been calculated. 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 L_f 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. 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.