Coordination abilities in aqueous 1:1 metal chelates of 1,3-dicarbonylic ligands:: absolute hardness and absolute electronegativity

For a series of monochelates of metal and ore-metal ions such as Ni2+, Co2+, Cu2+, Fe3+, Cr3+, VO2+, and UO22+ with structurally similar 1,3-dicarbonylic ligands it has been found that the logarithms of stability constants are essentially linear functions of the ligand pK. Correlation data show that for a given transition metal ion it is possible to estimate approximate stability constants of a wide range of 1,3-dicarbonylic monochelates and, therefore, predict overall equilibrium constants. Results have provided information concerning absolute hardness and absolute electronegativity of the metal ion considered against the stability of 1:1 chelates in aqueous solution.