Search

The theoretical and experimental aspects of the spin sublevels of transition metal complexes are briefly reviewed. First, the complexes with organic ligands are discussed. For metal-localized dd states and metal-to-ligand charge transfer dπ* states, the splitting among spin sub-levels is mainly governed by the spin-orbit coupling, and the magnitude of the splitting is of the order of 10–100 cm−1. For ligand-localized triplet ππ* states, the splitting is mainly governed by the spin-spin coupling, and the magnitude of the splitting is mainly governed by the spin-spin coupling and the magnitude of the splitting is of the order of 0.1 cm−1. Theoretical evaluation of the radiative rate constants for the individual spin sublevels is discussed, and is compared with experimental data. Finally, the spin sublevels of metal clusters are discussed.