Comparative Critical Micellar Concentration Parameters of Biopotent Metal - Benzothiazole Chelates in Different Chemical Compositions

摘要

Background: A perusal of literature survey reveals that a number of transitionmetal soaps and their complexes have been studied however scanty references are availableas to the investigation of copper (II) soap-complexes. The present study also gives anaccount of our understanding of several aspects of micelle formation of copper soapcomplexesin the mixed non-aqueous solvents. Attempts have also been made to study thephysico-chemical properties of Cu(II) soap-complexes in methanol + benzene solventmixtures and the findings has been reported in this paper.Objective: Owing to proven industrial utility of copper (II) soap complexes, the paperprovide a fundamental and informative account of micellar features of three complexes in40% methanol-benzene and 80% methanol-benzene solvent mixture. The complexessynthesized are abbreviated as follows:(1) Copper-caprylate with 2-amino-6-methyl benzothiazole: CCplAMB(2) Copper-caprate with 2-amino-6-methyl benzothiazole: CCprAMB(3) Copper-laurate with 2-amino-6-methyl benzothiazole: CLrtAMBMethod: The density, molar volume, and apparent molar volume of Cu (II) surfactantswith substituted 2-amino-6-methyl benzothiazole in 80 % and 40% benzene-methanolmixture has been determined at constant temperature 298.15 K.Results: The results were used to determine the Critical Micelle Concentration (CMC), theeffect of chain length of the complex molecule on CMC and complex-solvent interactions.The CMC decreases with the increase in the chain length of fatty acid segment of complex.The apparent molar volume has been examined in terms of Masson equation, and thelimiting apparent molar volume has been interpreted in terms of solute-solvent interaction.The solute – solute interactions were found to be greater before CMC whereas solutesolvent interactions were found greater after CMC. There is appreciable increase inaggregation of surfactant molecules at a definite concentration and the structure of theaggregates is entirely different below and above CMC. The effect of polarity of thesolvent has also been studied.Conclusion: The current topic will contribute to understand the solution behavior, micellarcharacters and different interactions which exist between solute-solute and solute-solventmolecules for their applications in various fields.