eng Oriental Scientific Publishing Company Material Science Research India 0973-3469 2010-03-16 7 1 235 238 2303 article Formation Constants of Lanthanide Metal Ion Chelates with Some Substituted Sulfonic Acids R. S. Sonone 1 G. H. Murhekar 1 Department of Chemistry, Govt. Vidarbha Institute of Science and Humanities, Amravati- 444 604, India.

The pKa and logK values of some substituted sulfonic acid in 70% (v/v) dioxane-water mixture have been determined using pH metric measurements. The stability constant of complexes of Gd (III), Tb (III) and Ho (III) with p-aminobenzenesulfonic (L1) and p-sulfophthalic acid (L2), 2-amino-5-chloro benzenesulfonic acid (L3) and trifluoromethanesulfonic acid (L4) have been determined at 0.1M ionic strength at 28±0.1 0C pH metrically. It is observed that both the metal ions formed 1:1 & 1:2 complexes with all the ligands.

 https://www.materialsciencejournal.org/vol7no1/formation-constants-of-lanthanide-metal-ion-chelates-with-some-substituted-sulfonic-acids/ Stability constant Chelates Sulfonic acids