Solubilization of Ni Imidazole Complex in Micellar Media of Anionic Surfactants, Sodium Dodecyl Sulfate and Sodium Stearate
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The solubilization and physicochemical behavior of a coordination complex of nickel, namely [Ni(im)6]F2·5H2O [hexakis(imidazole)nickel(II) fluoride pentahydrate], in aqueous micellar media of anionic surfactants, i.e., sodium dodecyl sulfate (SDS) and sodium stearate (SS), were investigated by using UV–Vis spectroscopy and electrical conductivity measurements. Spectroscopic techniques were used for the computation of binding constant (K b), partition coefficient (K x), change in free energy of binding (ΔG b), and change in free energy of partition (ΔG p), whereas electrical conductivity data was helpful to calculate thermodynamic parameters of micellization of surfactants in the presence of the Ni complex, i.e., standard entropy of micellization (ΔS m), free energy (ΔG m), and enthalpy of micellization (ΔH m). It is evident from the results that solubilization of the Ni complex takes place because of electrostatic as well as hydrophobic interactions. The presence of the Ni complex in micellar media increases the critical micelle concentration of both surfactants owing to the structure-breaking effect.
KeywordsSurfactant Solubilization UV–Vis spectroscopy Micelles Partition coefficient
Financial support from the Higher Education Commission (HEC) Pakistan is gratefully acknowledged. (HEC scholarship No. 213-53340-2PS2-042 for S. Noor, Grant No. SRGP 1499 and NRPU 4923 for M. A. Rashid).
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