Vol. 7, Special Issue 6 (2019)
Stability constant of rare earth metal ion with substituted thiazole schiff base in mixed solvent media and thermodynamic parameter
Author(s): BN Muthal
Abstract: The Schiff bases derived from substituted aminothiazole i.e.2-4-Diamino-5-chlorothiazole and R-Substituted salicylaldehyde (R-5-CH3 and 5-Cl) or 2hydroxy-1-naphthaldehyde i.e. (5MS) 2DET, (5CS) 2DET and (HN) 2DET and Rare earth metal ion LaIII, CelIl, PrlIl, NdlIl, SmlIl", GdlIl, TblIl, HolIl, DylIl and YblIl 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 (35°C and 45 °C) using Bjerrum pH metric technic as adopted by Irving-Rossoti.The formation constants are determined by Half Integral method. The stability constants of Rare earth 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: 521-524 | 382 Views 51 Downloads
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How to cite this article:
BN Muthal. Stability constant of rare earth metal ion with substituted thiazole schiff base in mixed solvent media and thermodynamic parameter. International Journal of Chemical Studies. 2019; 7(6): 521-524.
