Terminal iron dinitrogen and iron imide complexes supported by a tris(phosphino)borane ligand.

@article{Moret2011TerminalID,
  title={Terminal iron dinitrogen and iron imide complexes supported by a tris(phosphino)borane ligand.},
  author={Marc‐Etienne Moret and Jonas C. Peters},
  journal={Angewandte Chemie},
  year={2011},
  volume={50 9},
  pages={
          2063-7
        }
}
Adaptable metallaboratranes: A tris- (phosphino)borane ligand stabilizes both low-valent Fe-N_2 complexes and a mid-valent imido species with a Fe≡NAr bond, thanks to its ability to shuttle between trigonal-bipyramidal and pseudotetrahedral geometries by elongation of the apical iron–boron bond (see picture) 

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