The perturbation molecular-orbital method (PMO) is used to define the 18-electron rule for organometallic π complexes with alternant-bonding networks. Situations where the rule does not hold are also discussed. The PMO method is also used to distinguish possible 18-electron rule isomers and to account for the fluxional behaviour of η4 and η2 metal complexes.
D. M. P. Mingos, J. Chem. Soc., Dalton Trans., 1977, 31 DOI: 10.1039/DT9770000031
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