International Journal of Chemical Studies
Vol. 2, Issue 5 (2015)
Study the thermodynamics of complex formation of Rare earth metal ions with substituted thiazole Schiff bases in mixed solvent media
Author(s): Muthal B.N, Raut B.N, Tekale A.S
Abstract: The Schiff bases derived from substituted aminothiazole i.e.2-4-Diamino thiazole and R-Substituted salicylaldehyde (R-5-CH3 and 5-Cl) or 2-hydroxy-1-naphthaldehyde i.e. (5MS)2DT, (5CS)2DT and (HN)2DT 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 (35 0C and 45 0 C) using Bjerrum pH metric technic as adopted by Irving Rossotti. The formation constants are determined by Half-Integral method. The stability constants of Rare earth metal (III) ion complexes have been to proportional to their ionic strength. The thermodynamic parameter (ΔH, ΔG and ΔS) were determined. The negative free energy change (ΔG) in each case indicates that the complexation is spontaneous. The enthalpy changes are exothermic. The positive values of ΔS Indicates the reactions are entropically favoured.
Pages: 35-38 | 1222 Views 17 Downloads
How to cite this article:
Muthal B.N, Raut B.N, Tekale A.S. Study the thermodynamics of complex formation of Rare earth metal ions with substituted thiazole Schiff bases in mixed solvent media. Int J Chem Stud 2015;2(5):35-38.