U. Siemeling et al., AMIDO](ETA(5)-PENTAMETHYLCYCLOPENTADIENYL)IRON(II) - A DIAMAGNETIC 14-ELECTRON COMPLEX WITH A POGO-STICK STRUCTURE, Organometallics, 17(3), 1998, pp. 483-484
The half-sandwich complex CpFeN(SiMe3)(2) was synthesized by the reac
tion, of iron(II) chloride in THF with 1 equiv of KN(SiMe3)(2) and sub
sequent addition of CpLi and was structurally characterized by X-ray
diffraction; its ''pogo-stick'' structure is unprecedented in the chem
istry of open-shell organometallics.