Study of N-[(benzoyl-amino)-thioxomethyl]-cystein metal(II)chloride complexes in aqueous medium at different temperatures

Electrical conductances of N-[(Benzoyl-amino)-thioxomethyl]-cystein Metal(II)chloride complexes (where Metal(II)=Mn(II), Co(II), Ni(II) and Cu(II) ) in water have been investigated at different temperatures ranging from 25 – 40 0 C over wide range of concentration from 1.00- 0.816 x10-3M. The limiting molar conductance (Λ0) data and ion association constants (KA) values were estimated by analyzing conductivity data in terms of Shedlovsky technique. For all electrolytic salts, the limiting equivalent conductances and the ion association constants increase with rise in temperature. Based on KA values and temperature dependence of Λ0, the thermodynamic parameters viz., changes in enthalpy (ΔH0), entropy (ΔS0) and free energy (ΔG0) have been determined. All the associations are exothermic in nature which is determined by negative values of ΔH0. The chosen metal complexes show ion pair association within experimental different temperature ranges; which is supported by negative values ΔG0.

Author(s): Lalzawnpuia and N. Mohondas Singh

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