Thermogravimetric, potentiometric, conductimetric and spectrometric studies on lanthanide complexes with some hydroxynaphthoic acid AZO dyes

Potentiometric, conductimetric, IR, NMR and TGA studies have been carried out on the complexes of trivalent yttrium, lanthanum, praseodymium, neodymium, samarium, gadolinium and erbium with some azo derivatives of 3-hydroxy-2-naphthoic acid. The ionization constants of the reagents and the formation constants of their metal complexes have been determined potentiometrically by Sarin's method. Complexation has also been studied by a conductimetric titration method and the solid complexes formed were separated, analysed and their structures have been elucidated by IR, NMR and TGA studies.