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Keywords:

  • ab initio calculations;
  • aromaticity;
  • coordination modes;
  • hypercoordination;
  • photoelectron spectroscopy
Thumbnail image of graphical abstract

Molecular wheels: Decacoordinated molecular wheels, Ta©B10 (see picture) and Nb©B10, showing the highest coordination number for the central atom in a planar environment at present, were produced in a laser-vaporization supersonic molecular beam and characterized by photoelectron spectroscopy and ab initio calculations. The highly symmetric Ta©B10 and Nb©B10 anions are doubly aromatic with six delocalized π electrons and ten delocalized σ electrons.