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Abstract
Reaction of the versatile tris(perfluoroethyl) cobalt(III) precursor [fac-(MeCN)3Co(C2F5)3] with [NMe4]F and [PPh4]Cl in THF formed the unexpected cobalt(III) bridging fluoride dimer [(C2F5)3Co(μ-F)]22−. The new fluoro-organometallic cobalt(III) complex was characterized by NMR and UV-vis spectroscopies, X-ray crystallography, cyclic voltammetry, and by computational methods. In the strongly coordinating solvent MeCN, [(C2F5)3Co(μ-F)]22− exhibits dynamic processes on the NMR timescale which are consistent with solvent coordination. However, in the weakly coordinating solvent CH2Cl2, a more static structure is observed suggesting that the dimer retains its structure in solution state. An electrochemical analysis of [(C2F5)3Co(μ-F)]22− was performed, and the data are compared to previously reported cobalt(III) perfluoroethyl complexes.
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