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Solubilization of Ni Imidazole Complex in Micellar Media of Anionic Surfactants, Sodium Dodecyl Sulfate and Sodium Stearate
Author(s) -
Younas Nafisa,
Rashid Muhammad Abid,
Usman Muhammad,
Nazir Sadia,
Noor Sadia,
Basit Abdul,
Jamil Muhammad
Publication year - 2017
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-017-1997-x
Subject(s) - chemistry , enthalpy , micelle , sodium dodecyl sulfate , inorganic chemistry , gibbs free energy , micellar solutions , aqueous solution , thermodynamics of micellization , partition coefficient , sodium , nickel , stearate , critical micelle concentration , organic chemistry , thermodynamics , physics
Abstract The solubilization and physicochemical behavior of a coordination complex of nickel, namely [Ni(im) 6 ]F 2 ·5H 2 O [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 (Δ G b ), and change in free energy of partition (Δ G 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 (Δ S m ), free energy (Δ G m ), and enthalpy of micellization (Δ H 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.