Background: Surfactants most characteristic phenomenon of micellization in
the bulk phase, as well as their ability to be accumulated at an interface are of immense
theoretical, applied and biological interests as indicated by large number of publication of
papers and reviews in last three decades. Particulars information about Copper (II) soaps
derived from natural oils, play a vital role in its selection in specific phenomena such as
foaming, wetting, detergency, emulsification etc. and also in their use as herbicides, fungicides,
pesticides and insecticides etc. The tendency of Copper soaps have complex formation
with compounds containing donor atoms like N, S, O, Br, etc. as benzothiazole and
other related compounds play significant role in biological activities due to the presence of
nitrogen and sulphur atoms, which are responsible for their pharmacological activities.
Objective: The copper surfactants derived from various edible (Groundnut and Sesame
oils) and non-edible oils (Neem and Karanj oils) and their complexes with nitrogen and
sulphur containing ligands such as 2-amino-6-methyl-benzothiazole have been synthesized
and studied for their structural aspects, which were confirmed using various techniques
like IR, NMR and ESR spectroscopy. Thermogravimetric analysis of complexes which is
derived from already synthesized copper (II) soaps with 2-amino-6-methyl benzothiazole
was done to confirm the thermal decomposition.
Methods: Thermo Gravimetric Analysis (TGA) has been used to study the thermal decomposition
of copper surfactants complexes to evaluate their energy of activation and various
thermodynamic parameters i.e. Gibbs free energy, enthalpy, entropy have been calculated.
Copper surfactants and their benzothiazole complexes were studied to test the validity of
various equations namely Freeman Carroll, Coats - Redfern, Horowitz - Metzger, Broido,
and Piloyan-Novikova related to thermal degradation.
Results: The degradation occurs in three steps and the value of activation energy is highest
for third step and smallest for the first steps. CNB and CKB need higher energy to degrade
than CGB and CSB. The all copper surfactants molecules have negative entropy, which indicates
that the decomposition reactions proceed with a lower rate.
Conclusion: Thermogravimetric degradation analysis will also provide significant information
about the removal of the natural soap segment from the environment. The studies
will be very important for pollution controlling and in the field of Green Chemistry.