Surface Tension Studies of Ternary System: Cu (II) Surfactants-2-amino-6-methyl Benzothiazole Complex Plus Methanol Plus Benzene at 311 K

摘要

Background: Exact information about micellar feature of Cu (II) Soaps play avital role in its selection in specific phenomena such as foaming, wetting, detergency,emulsification, etc. and also in their use as herbicides, fungicides, pesticides andinsecticides. Copper soaps having a tendency of complex formation with the compoundscontaining donor atoms like N, O, Br, S, etc. It is well known that benzothiazoles arederivatives of anilines and play significant role in biological activities and having sufficientindustrial and analytical applications.Objective: Coherence of biological activities of copper soaps and benzothiazole stimulatedour interest to extend the studies in their cumulative form as complexes. It is anticipatedthat it will generate new hopes in the pharmacological activities. Critical micelleconcentration, revelation of the nature and size of micelles formed and surface activeproperties have been investigated in the proximity of mixed solvents having widedifference in degree of polarity.Methods: Copper soap complex solutions in polar and non-polar solvent (methanol andbenzene) mixtures have been chosen for the surface tension studies. Their micellar andcolloidal behaviour have been analysed and these results confirm that CMC values dependupon composition of solvent mixture and are found to decrease with increase in chainlength of copper surfactant (caprylate, caprate and laurate) in the referred molecule takenfor study.Results: The results of surface tensions have been explained on the basis of Szyszkowski’sempirical equation and it is observed that X, Y and (-XlnY) lead to the confirmation of factthat the change in the behaviour of copper surfactant complex occurs differently at twodifferent compositions (40% & 80%) of methanol-benzene mixture. The results revealsthat the numerical value of X for all the complexes in 40% and 80% methanol-benzenemixture below CMC are higher than above CMC. The area covered by 1 g. mole of thecomplex decreases gradually from 40% methanol to 80% methanol. The values of parachorof the complex solution increase with increase in the mole fraction and volume percent ofmethanol below CMC and decrease above CMC. The plots of parachor against the molefraction of the copper surfactant complex are characterized by an intersection of twostraight-lines at the CMC of copper surfactant complex.Conclusion: Hammic and Andrew’s equations has been successfully applied to explain thebehaviour of copper surfactant complex in two different compositions of methanolbenzenemixtures.