Spectroscopic, potentiometric and thermodynamic studies of azo rhodanines and their metal complexes

Potentiometry and geometrical structure of some azodye compounds and their metal complexes

“…The azo compounds are used in dyeing processes and some of them are used in the analytical separation of many metal ions present in a mixture [11]. The effect of temperature on the proton-ligand dissociation constants of a series of azo dyes was previously studied potentiometrically [12][13][14][15] and the stability constants of their complexes were found to be in the order Mn +2 b Co +2 b Ni 2+ b Cu 2+ . The corresponding thermodynamic parameters (ΔG, ΔH, ΔS) were also derived.…”