The redox pair (μ4-TCNE)Fe(CO)2(C5H5)44+/3+: Surprisingly small metal-ligand interaction and the first resolved EPR hyperfine structure (13C, 14N, 57Fe) of a tetranuclear complex with TCNE-
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Inorganic Chemistry Communications 8 (7): 600--602 (2005)

Complexation of tetracyanoethylene with dicarbonyl(cyclopentadienyl)iron moiety gave the title tetranuclear complex, CpFe(CO)24(m4-h1:h1:h1:h1:-TCNE)BF44 (1·BF44; Cp = h5-C5H5) with ligand coordination via its nitrile groups. Electrochem. and absorption spectroscopy (UV/Vis, IR) of the complex 1·BF44 reveal only a small degree of metal-to-ligand p back donation, in contrast to previously characterized compds. (TCNE)(MLn)4. Accordingly, the one-electron reduced (m4-TCNE)CpFe(CO)243+ exhibits a very well resolved EPR spectrum at g = 1.9965 with detectable coupling of 0.055 mT for 57Fe in natural abundance from four coordinated Fe(CO)2(C5H5)+ groups. on SciFinder(R)
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