Fig. 1: Schematic representation of AOs comprising δ and φ bonds. | Nature Communications

Fig. 1: Schematic representation of AOs comprising δ and φ bonds.

From: δ and φ back-donation in AnIV metallacycles

Fig. 1

a M–M δ interaction between two dxy (or \({{d}}_{{{x}}^2 - {{y}}^2}\)) AOs. b M–M–M δ interaction among three \({{d}}_{{{z}}^2}\) AOs. c “head-to-head” M–L δ interaction between fxyz (or \({{f}}_{{{y}}({{x}}^2 - {{z}}^2)}\)) AO of metal (top) and unoccupied ligand orbital (bottom). d “side-to-head” M–L φ back-donation interaction between \({{f}}_{{{x}}({{x}}^2 - 3{{y}}^2)}\) (or \({{f}}_{{{y}}(3{{x}}^2 - {{y}}^2)}\)) AO of metal (top) and unoccupied ligand orbital (bottom).

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