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Keywords:

  • cluster compounds;
  • electron localizability indicator;
  • metal–metal interactions;
  • rare earths;
  • rhenium;
  • ruthenium
Thumbnail image of graphical abstract

Salt of the (rare) earth: The reactions of ytterbium(II) iodide with alkali metal salts of the [CpRu(CO)2] and [Cp2Re] anions afford molecular compounds that have two unsupported Yb[BOND]TM bonds (TM=transition metal; see scheme). Electron localisability indicator calculations were performed and revealed highly polar metal–metal bonds.