Transition metal complexes with bulky 4,6-di-tert-butyl-N-aryl(alkyl)-o-iminobenzoquinonato ligands: Structure, EPR and magnetism

Coordination compounds based on the substituted o-iminoquinonato, o-iminosemiquinonato and o-amidophenolato ligands with transition metal ions are described from the viewpoint of their structural and magnetic properties. The present review summarizes data on homoleptic transition metal complexes of bulky bidentate N-aryl-o-iminoquinonato type ligands involving comparison with o-quinonato analogues; penta- and hexacoordinate bis-o-iminobenzoquinonato complexes of ML2X, ML2X2 and ML2L′ types; mono-o-iminobenzoquinonato complexes and complexes based on three-, tetra- and pentadentate bis-o-iminobenzoquinones. Synthetic aspects are also included.