Isolation and Characterization of the Homoleptic Nickel(I) and Nickel(II) Bis‐benzene Sandwich Cations

摘要

Abstract A stable salt of the metalloradical Ni(C6H6)2+ hitherto unknown in the condensed phase was synthesized from Ni(CO)4+WCA− and benzene (WCA−=F{Al(ORF)3}2−; RF=C(CF3)3). Single crystal XRD reveals a remarkable asymmetrically η3,η6‐slipped sandwich structure. The magnetic properties of the Ni(C6H6)2+ cation were determined in solution and in the gas phase. Oxidation with the synergistic Ag+/0.5 l2 system led to the salt Ni(C6H6)22+(WCA−)2. All products were fully characterized by means of IR, Raman, NMR/EPR, single crystal and powder XRD.