Abstract
Thermodynamic proton ligand stability constants of N-phenylvioluric acid (PVA), N- p-tolylvioluric acid ( p-TVA), N- o-tolylvioluric acid ( o-TVA) and N- m-tolylvioluric acid ( m-TVA) and thermodynamic formation constants of the complexes of La 3+, Ce 3+, Pr 3+, Nd 3+, Sm 3+, Gd 3+, Eu 3+, Dy 3+ and Ho 3+ with these four closely related N-arylvioluric acids have been determined in 50% v/v ethanol-water solvent. The order of stability for rare earths with N-arylvioluric acids is La 3+ <Ce 3+ <Pr 3+ <Nd 3+ <Sm +3 <Gd 3+ <Eu 3+ <Dy 3+ < Ho 3+. The stability constants are found to decrease as the temperature increases. The thermodynamic functions Δ G 0, Δ H 0 and Δ S 0 corresponding to the stepwise complexation processes have been evaluated. The stepwise formation of complexes is predominantly enthalpy driven. The other factors affecting complex stability of metal ions are discussed.
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