M. Guillemot et al., A 4-OXIDATION-STATE FAMILY OF COORDINATED CARBON - THE FIRST ISOLABLEAND CRYSTALLOGRAPHICALLY CHARACTERIZED TRIRADICAL [M]-C-4-[M](3+), Organometallics, 17(10), 1998, pp. 1928-1930
The deep blue complex [Cp(dippe)Fe(mu-C-4)-Fe(dippe)Cp*](3+)[PF6](-)(
3) (4(3+)[PF6](-)(3)) was prepared by a cascade of three successive on
e-electron oxidations of the neutral complex Cp(dippe)Fe(mu-C-4)Fe(di
ppe)Cp (4). This unprecedented trication was characterized by X-ray m
ethods, and its triradical structure was established on the basis of M
ossbauer, near-IR, and ESR spectroscopy.