Physicochemical Determination Of Cmc And Thermodynamic Evolution: Metallomicelles Of Crii, Mnii, And Coii Complexes

Abstract

Organometalic surfactants have been synthesised using the heterocyclic ligand 2-((3-methyl -5- oxo -1- phenyl-4,5-dihydro-1H-pyrazol-4-yl)(phenyl)methylene)hydrazine carbothioamide (PMBP-TSC) and transition metal ions (Cr^II, Mn^II, and Co^II). The electrical conductivity at 15, 25, 35 and 45°C, as well as Uv-visible spectrophotomety at 25°C, were used to determine the critical micelle concentration (CMC), ionization degree (α), degree of counter ion binding (β), binding constant (K_b), and other physicochemical parameters of micellization. These parameters include the standard Gibb’s free energy change, Δ_mG°, standard enthalpy change, Δ_mH°, and  standard entropy change, Δ_mS°. Based on the negative Δ_mG° micellization is thermodynamically posible and spontaneous. The estimate of the activation energy (Ea) was estimated using the Coats-Redfern method based on the examination of thermogravimetric analysis (TGA) and the kinetics of thermal degradation. According to the data, adding metal causes the CMC to decrease and the Ea to rise, proving that Cr^II has the best level of thermal stability.