Factors affecting the stabilities of complexes containing only monodentate ligands

13 Factors affecting the stabilities of complexes containing only monodentate ligands 

Although there is no single generalization relating values of stability constants of complexes of different cations with the same ligand, a number of useful correlations exist, and in this section we explore some of the most important of them. 

The stabilities of complexes of the non-r/-block metal ions of a given charge normally decrease with increasing cation size (the size of the ion is in a crystallographic sense). Thus, for a complex with a given ligand, L, the order of stability is Similar behaviour is found for the 

For ions of similar size, the stability of a complex with a specified ligand increases substantially as the ionic charge 

For a metal with two (or more) oxidation states, the more highly charged ion is the smaller the effects of size and charge reinforce each other, leading to greater stability for complexes involving the higher oxidation state metal ion. 

---