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A molecular orbital (MO) diagram for [ML 6]n+ compounds where the ligands (O2−) can act as both σ and π donors. Transition metal d electrons fill levels starting from t 2g* in a way that progressively negates favourable π interaction, thus favouring complexes with few to no d electrons. Reproduced with permission from Pfennig (2015 ▸; Fig. 160.26, p. 531), copyright (2015) Wiley.
