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The reaction of Cr(η6-CH3C6H5)2 with dbcpH−NO2 (dbcpH−NO2 = 1-benzoyl-3-nitro-6-hydroxy-6-phenyl fulvene) proceeds with the evolution of dihydrogen and formation of the ionic derivative [Cr(η6-CH3C6H5)2][dbcp−NO2] (dbcp−NO2 = 1,2-dibenzoyl-4-nitro-cyclopentadienyl anion) which was characterized by X-ray diffraction, electrochemical and EPR techniques. The cation [Cr(η6-CH3C6H5)2]+, which in the solid state presents an unprecedented cis-eclipsed arrangement of the arene rings, undergoes a chemically reversible, one-electron reduction to the corresponding neutral derivative. [ABSTRACT FROM AUTHOR]