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(a) Schematic view of the donor–acceptor bond in plumbylene dimer 4. Left: View in the direction orthogonal to the Pb(2)Si(9)Si(12) plane. Right: After rotation by 90° around the Pb(1)Pb(2) bond. (b) Calculated surface diagrams of HOMO (left) and LUMO (right) of dimer 4 (isodensity value: 0.05; color code: dark gray: Pb; blue gray: Si; light gray: C; H-atoms omitted).
