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

Abstract

For a series of monochelates of metal and oxo-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.