Abstract
Complexation of tetracyanoethylene with dicarbonyl(cyclopentadienyl)iron moiety gave the title tetranuclear complex, [[CpFe(CO)2]4(m4-h1:h1:h1:h1:-TCNE)][BF4]4 (1·[BF4]4; Cp = h5-C5H5) with ligand coordination via its nitrile groups. Electrochem. and absorption spectroscopy (UV/Vis, IR) of the complex 1·[BF4]4 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)2]4]3+ 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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