[Fe(Cl) 4 ][Fe(NO 3 ) 2 (OPPh 2 py) 2 ], 2, and [Fe(NO 3 ) 2 (Cl)(OPPh 2 py)], 3, were obtained when [Fe(Cl) 4 ][Fe(Cl) 2 (OPPh 2 py) 2 ], 1, was allowed to react with respectively 2 and 4 eq. silver nitrate. Complexes 2 and 3 catalysed the autoxidation of cyclohexene. They transfer the oxygens of their nitrato groups to phosphines. Complex 3 has been characterized by single crystal X-ray diffraction. The bite of the OPPh 2 py ligand repels the presence of the chlorine atom in the Fe(NO 3 ) 2 plane of 3 which influences the geometric features of the nitrato groups, their oxygen transfer ability.