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TGA technique has been applied to Copper (II) soaps derived from Mustard and Soyabean oils and their complexes, with N and S containing ligands, for their thermal analysis and evaluation of energy of activation. Of the six systems studied, three (CM, CMU and CMB) are derived from Mustard oil, and three (CS, CSU and CSB) are derived from Soyabean oil. The results of thermogravimetric analysis reveal that all the referred systems undergo stepwise thermal degradation in three steps corresponding to the decomposition of polyunsaturated, monounsaturated and unsaturated fatty acid components of their corresponding edible oil in the temperature range of 473K-823K (2000C-5500C). The energy of activation 'E' has been evaluated for thermal degradation of each of the three steps for all our referred systems, using various equations like Coats -Redfern, Horowitz -Metzger and Broido equation. It has been observed that for all the equations applied, the stepwise energy of activation follow the order -Step III > Step II > Step I. The general order of activation energies can be represented as -Copper Mustard and Soyabean soap-Urea complex > Copper Mustard and Soyabean soap-2-amino,6-chloro Benzothiazole complex > Copper Mustard Soap > Copper Soyabean Soap.

The solid copper(II) soaps derived from Mustard oil and Soyabean oil and their complexes with ligands containing nitrogen and sulphur atoms like urea, thiourea and 2-amino-6-chloro benzothiazole have been synthesized and characterised by elemental analysis, IR, NMR, ESR spectroscopy and magnetic moment studies. From the analytical data, the stoichiometry of the complexes have been observed to be 1: 1 (metal: ligand). The magnetic moment studies suggest the dimeric nature of the complexes. IR, NMR and ESR spectral details confirm that complexation has taken place successfully. The results indicate that the complexes possess elongated octahedral geometry. Conductometric studies suggest that the soaps and complexes are non-electrolytic in nature. The fungi toxicities of these ecofriendly and biodegradable soaps and complexes have been investigated.

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The viscosity, specific viscosity, and fluidity of Cu(II) surfactant complexes derived from mustard oil with urea/thiourea/2-amino-6-chloro benzothiazole in a non-aqueous solvent has been determined at a constant temperature of 303.15 K. The results were used to determine the critical micelle concentration (CMC), soap complex-solvent interactions and the effect of chain length of the surfactant molecule on various parameters. The conclusions with regard to solute-solute and solute-solvent interaction have been discussed in terms of well-known Moulik and Jones-Dole equations. The effect of surfactant concentration on the viscosity of the solution in non-polar solvent has been discussed. The observations suggested that the structure breaking effect by the solute on the solvent molecules is more prominent above CMC as compared to below CMC after the formation of the micelles. This information plays a role in various industrial and biological applications.