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Synthesis of Cu (II) soaps derived from non - edible oil i.e. Karanj and its complex with 2-amino-6–methyl Benzothiazole for comparative studies. Spectral studies (IR and NMR) have been carried out to understand the structural insight of the soaps and complex synthesized . Micellar characterization of Cu (II) soaps derived from Karanj Oil has been looked into using benzene and benzene –methanol (two compositions) as the solvent [2-3]. Ultrasonic interferometer, one of the versatile techniques, was used to study the binary and ternary systems. Ultrasonic speed have been measured in binary and ternary systems containing Copper soap derived from Neem oil in 100% benzene, 80 % and 60% methanol benzene mixture. From these values, the specific acoustic impedance Z, adiabatic compressibility βad, intermolecular free length Lf, apparent molar compressibility k, molar sound velocity R, primary solvation number Sn have been calculated. The results have been fitted to Bachem’s and Masson equation.
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