THE COORDINATION OF PI-CONJUGATED BIDENTATE LIGANDS

Double bonding in chelated metal complexes gives rise to specific electronic effects on the metal d-orbitals. It is shown how these interactions can be incorporated in a ligand field model. Special emphasis is placed on the symmetry characteristics of the resulting hamiltonian. Specific predictions of this model with regard to the trigonal splitting in chiral trischelates and to the orthorhombic field in planar bischelates are confronted with the most recent experimental data. © 1990 IUPAC