Fig. 2: Actinide and transition metal metallacycle structures and their respective M–L δ and φ interactions. | Nature Communications

Fig. 2: Actinide and transition metal metallacycle structures and their respective M–L δ and φ interactions.

From: δ and φ back-donation in AnIV metallacycles

Fig. 2

a Metallacyclopropene. b Metallacyclocumulene, (R = trimethylsilyl, phenyl; M = Ti, Zr, Th, Pa, U, Np, Pu). c “head-to-side” M–L δ interaction between fxyz (or \({{f}}_{{{y}}({{x}}^2 - {{z}}^2)}\)) AO of metal and unoccupied orbital of the cyclopropene ligand in (η5-C5Me5)2An[η2-C2R2]. d “side-to-side” M–L φ interaction between \({{f}}_{{y}{z}^2}\) (or \({{f}}_{{x}{z}^2}\)) AO of metal and unoccupied orbital of the cyclocumulene ligand in (η5-C5Me5)2An[η4-C4R2], An=Pa–Pu.

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