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Keywords:

  • aromaticity;
  • bridging ligands;
  • main-group elements;
  • niobium;
  • phosphorus
Thumbnail image of graphical abstract

Divalent Group 14 salts react with the [Na(thf)x]+ derivative of the terminal niobium phosphide anion [P[TRIPLE BOND]Nb{N(Np)Ar}3] (Np=neopentyl, Ar=3,5-Me2C6H3) to give complexes of the form [(μ233-cyclo-EP2){Nb[N(Np)Ar]3}2] (E=Ge, Sn, and Pb; see structure). The bridging {cyclo-EP2} units in these complexes can be considered as neutral 2π-electron three-membered rings that are isolobal to the cyclopropenium ion.