Isolation and Characterization of the Homoleptic Nickel(I) and Nickel(II) Bis‐benzene Sandwich Cations
Manuel Schmitt, Maximilian Mayländer, Tim Heizmann, Sabine Richert, Christine Bülow, Konstantin Hirsch, Vicente Zamudio‐Bayer, J. Tobias Lau, Ingo Krossing
Abstract
Abstract A stable salt of the metalloradical [Ni(C 6 H 6 ) 2 ] + hitherto unknown in the condensed phase was synthesized from [Ni(CO) 4 ] + [WCA] − and benzene ([WCA] − =[F{Al(OR F ) 3 } 2 ] − ; R F =C(CF 3 ) 3 ). Single crystal XRD reveals a remarkable asymmetrically η 3 ,η 6 ‐slipped sandwich structure. The magnetic properties of the [Ni(C 6 H 6 ) 2 ] + cation were determined in solution and in the gas phase. Oxidation with the synergistic Ag + /0.5 l 2 system led to the salt [Ni(C 6 H 6 ) 2 ] 2+ ([WCA] − ) 2 . All products were fully characterized by means of IR, Raman, NMR/EPR, single crystal and powder XRD.