Hg(II)⋅<i>d</i>⁸[M] Interactions: Are they Metallophilic Interactions or Spodium Bonds?

Abstract Some literature reports have shown the existence of short Hg(II)⋅⋅⋅d 8 [M] (M=Pd, Pt) contacts between linear Hg(II) and square planar d 8 [M] complexes that have been defined as heterometallophilic interactions. Linear L−Hg(II)−L complexes exhibit a π‐hole or positive belt of electrostatic potential at the Hg atom, whereas late transition metals can serve as effective electron donors through their filled d z 2 orbitals. This study provides compelling evidence that Hg(II)⋅⋅⋅d 8 [M] interactions should be more appropriately termed spodium bonds.

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