Experimental

R factor = 0.025; wR factor = 0.069; data-to-parameter ratio = 15.8. In the title compound, [Fe(C5H5)(C12H11N2O2)], the two cyclopentadienyl (Cp) rings are nearly eclipsed and parallel to each other, the dihedral angle between their mean planes being 2.54 (1). One of the Cp rings is substituted by a nitrobenzenamine group, which is essentially perpendicular to the substituted cyclopentadienyl ring, with an N—C(H2)—C— C torsion angle of 89.8 (2). Intramolecular N—H O and N—H N hydrogen bonds occur. In the crystal, weak C— H O hydrogen bonds link adjacent molecules. Related literature For background to the design and properties of ferrocen