International Journal of Chemical Studies
Vol. 5, Issue 1 (2017)
Formation constant of Lanthanide metal (III) ions with substituted thiazole Schiff bases at Different Ionic Strength and their thermodynamic parameter
Author(s): Muthal BN
Abstract: The Schiff bases derived from substituted aminothiazole i.e.2-4-Diamino-5-chlorothiazole and 2-hydroxyacetophenone (R-5-CH3 and 5-Cl) or 2-hydroxy-1-acetonaphthanone i.e. (2H5MPM)2DCT, (2H5CPM)2DCT and (2HN)2DCT and Rare earth metal ion LaIII, CeIII, PrIII, NdIII, SmIII, GdIII, TbIII, HoIII, DyIII and YbIII Nitrate Salts. The stability constants of lanthanide metal ion complexes in mixed solvent media in ethanol-water 50:50 (v/v) at different ionic strength µ = 0.05, 0.1, 0.15 and 0.2 M (NaClO4) and at different temperature (350C and 45 0C) using Bjerrum pH metric technic as adopted by Irrving-Rossoti. The formation constants are determined by Half-Integral method. The stability constants of Lanthanide metal (III) ion complexes have been proportional to their ionic strength. The thermodynamic parameter (H, G and S) were determined. The negative free energy change (G) in each cases indicates that the complexation is spontaneous. The enthalpy changes are exothermic. The positive values of S Indicates the reactions are entropically favoured.
Pages: 79-82 | 1000 Views 23 Downloads
How to cite this article:
Muthal BN. Formation constant of Lanthanide metal (III) ions with substituted thiazole Schiff bases at Different Ionic Strength and their thermodynamic parameter. Int J Chem Stud 2017;5(1):79-82.