Abstract: | Star gazing: The six-coordinate organoniobium(V) compound NBu(4) ](2) NbO(C(6) F(5) )(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). |