Ligating Properties of 5-Nitrobarbituric Acid

Abstract

The dissociation constant of 5-nitrobarbituric acid and the stability constants of its Co II , Ni II and Cu II complexes were determined potentiometrically. The thermodynamic parameters of dissociation were evaluated. The effect of solvents on the pK values was explained from aquation and solvation views. 5-Nitrobarbituric acid solid complexes of Mn II , Co II , Ni II , Cu II and Zn II , and the mixed metals, Fe-Co, Fe-Ni were prepared and characterized based on elemental analysis, spectra (electronic, IR, and Mössbauer), magnetism and thermal measurements.