Stability Constants of Lanthanides(III) Chelates with Substituted Chalcones

Abstract

The interaction of Ce(III), Pr(III), Nd(III), Sm(III), Gd(III),   Dy(III), Yb(III) and Lu(III) metal ions with 2′-hydroxy-(3,4-   dioxymethylene)-5′-methyl chalcone (ligand-1) and 2′-hydroxy-   5′-methyl-4-methoxy chalcone (ligand-2) have been investigated   by pH-metric technique at 0.1 M ionic strength at 27 ± 0.1 ºC   in 70 % dioxane-water mixture. The data obtained were used   to estimate the values of proton-ligand stability constant (pK)   and metal-ligand stability constant log K. It is observed that   Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Dy(III), Yb(III) and   Lu(III) metal ions formed 1:1 and 1:2 complexes with all the   ligands.