Macrocyclic ligand control of the thermodynamic stabilities of nickel complexes containing 14- to 17-membered macrocyclic rings. X-Ray crystal structure of the trans nickel(II) bromide complex of the 16-membered ring

The thermodynamic stabilities of 6-co-ordinate nickel complexes of related 14- to 17-membered macrocyclic ligands containing O2N2-donor sets show a maximum at the 16-membered ring complex; an X-ray structure of this complex confirms a trans 6-co-ordinate structure with the nickel ion contained in the hole of the ligand.