• Dr.Ganesh D Tambatkar

Abstract The complexation behaviour of Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Dy(III), Yb(III), and Lu(III) metal ions with two substituted chalcone ligands, namely 2′-hydroxy-(3,4-dioxymethylene)-5′-methylchalcone (Ligand-I) and 2′-hydroxy-5′-methyl-4-methoxychalcone (Ligand-II), has been investigated using the pH-metric technique. The studies were carried out at an ionic strength of 0.1 M and a temperature of 27 ± 0.1 °C in a 70% dioxane–water medium. The experimental data were analysed to determine the proton–ligand stability constants (pK) and metal–ligand stability constants (log K). The results indicate that all the investigated lanthanide(III) ions—Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Dy(III), Yb(III), and Lu(III)—form stable 1:1 and 1:2 metal-to-ligand complexes with both substituted chalcone ligands under the experimental conditions. The stability constants provide useful information regarding the complexation behavior and relative binding affinities of these lanthanide(III) ions toward the selected chalcone ligands.

stability constant,ligand lanthanide

"Investigation of Stability Constants of Selected Lanthanide(III)–Substituted Chalcone Complexes", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.13, Issue 9, page no.d268-d276, September-2026, Available :http://www.jetir.org/papers/JETIR2609329.pdf

"Investigation of Stability Constants of Selected Lanthanide(III)–Substituted Chalcone Complexes", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.13, Issue 9, page no. ppd268-d276, September-2026, Available at : http://www.jetir.org/papers/JETIR2609329.pdf