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Keywords:

  • hypovalent compounds;
  • niobium;
  • non-VSEPR structures;
  • organometallic compounds;
  • pentagonal-pyramidal structures
Thumbnail image of graphical abstract

Star gazing: The six-coordinate organoniobium(V) compound [NBu4]2[NbO(C6F5)5] has been found to exhibit a pentagonal-pyramidal (PPY-6) structure, which is unprecedented in organotransition-metal chemistry (see picture: complex as viewed down the O–Nb axis; C in gray, O in red, F in yellow, and Nb in blue).