Access to the Bis‐benzene Cobalt(I) Sandwich Cation and its Derivatives: Synthons for a "Naked" Cobalt(I) Source?. (25th June 2018) - Meier, Stefan C.
Abstract: The synthesis and structural characterization of the hitherto unknown parent Co(bz)2 + (bz=benzene) complex and several of its derivatives are described. Their synthesis starts either from a CoCO5 + salt, or directly from Co2 (CO)8 and a Ag + salt. Stability and solubility of these complexes was achieved by using the weakly coordinating anions (WCAs) [Al(OR F )4 ] − and [F{Al(OR F )3 }2 ] − {R F =C(CF3 )3 } and the solvent ortho ‐difluorobenzene ( o ‐DFB). The magnetic properties of Co(bz)2 + were measured and compared in the condensed and gas phases. The weakly bound Co( o ‐dfb)2 + salts are of particular interest for the preparation of further Co I salts, for example, the structurally characterized low‐coordinate 12 valence electron Co(P t Bu3 )2 + and Co(NHC)2 + salts.