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3. The 16 and 18 electron rule in organometallic chemistry and homogeneous catalysis
4. The reader has, however, to bear in mind that this classification, as any other elsewhere, is just an artefact for an easier understanding.
5. The FMOs (fragment molecular orbitals) of the principal transition metal fragments have been catalogued and those of the indicated fragments can be thought of as the hybrids which form upon removal of one ligand from planar L3M or L4M complexes, respectively. Albright. A., Burdett, J. K., Whangbo, M. H. Orbital Interactions in Chemistry; Wiley: New York, 1985.