A.B. Naik, M.S. Poharkar, Stability Constant of Rare Earth Metals with Substituted Thiazoles at 298.15K, Volume 64, International Letters of Chemistry, Physics and Astronomy (Volume 64)
https://www.scipress.com/ILCPA.64.106
Abstract:
    The stability constant on complexation of rare earth metal ions Eu (III), Gd (III), Nd (III) and Tb (III) with substituted thiazole in 70% Dioxane (Dx)-water mixture have been determined by a pH and spectrophotometric method at 298.15K and ionic strength 0.1mol.dm<sup>-3</sup> (sodium perchlorate). At constant temperature, the stability constant of the formed complexes decreases in the order Tb (III), Gd (III), Eu (III), Nd (III). The dissociation process is non-spontaneous, endothermic and entrophically unfavorable while formation of metal complexes has been found to be spontaneous, endothermic and entrophically favorable.
Keywords:
    Dx-Water, pH Metric, Rare Earth Metal Ions, Spectrophotometric, Stability Constant, Thiazole