Complexation and Extraction Studies of 2-[(Benzothiazolyl) azo]-4-benzylphenol with Cd+2 Ion

Abstract

      The extraction method shows optimum pH of extraction was  (pHex= 9), and the reaction of complexation need 50µg Cd⁺² ion (8.89×10-5M) in aqueous solution to give higher distribution ratio and more stable complex, shaking time necessary to reach equilibrium was (10minutes), as well as stoichiometry studies show the more probable structure of complex extracted was (1:1) (Metal:Ligand) [Cd⁺²(BTABP)(Cl^-)], organic solvent effect was study demonstrate there is no linear relation between dielectric constant (ε) of organic solvent and distribution ratio (D), but there is an effect for organic solvent structure to participate in the formation of complex,  effect of temperature on extraction method shows that reaction between ligand (BTABP) and Cd⁺² ion was endothermic reaction and the enthalpy of extraction  ΔHex = 0.0087 KJ.mol-1 Gibb,  Free energy  ΔGex = 52.4 KJ.mol-1 and  entropy ΔSex= 157.4 KJ.mol-1, synergism effect shows participate one molecule of TBP in each molecule of complex formed and effect to enhanced distribution ratio (D) [Cd⁺²(BTABP)(Cl^-)(TBP)].