Fig. 5: AdNDP bonding elements found between the C2(SiMe3)2 ligand and the M center in the example of Pa-propene complex. | Nature Communications

Fig. 5: AdNDP bonding elements found between the C2(SiMe3)2 ligand and the M center in the example of Pa-propene complex.

From: δ and φ back-donation in AnIV metallacycles

Fig. 5

a Two direct Pa–C σ bonds (left and right). b Three-center Pa–C–C π bond. c Singly occupied three-center Pa–C–C δ bond. Sticks between atoms help visualization and do not necessarily represent classical 2c–2e bonds here and elsewhere. ON is equal to 2.00|e| or 1.00|e| in an ideal case for a doubly or singly occupied bond, respectively.

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