In the title compound, [Fe(C5H5)(C15H16NO)], the two cyclo­penta­dienyl (Cp) rings are nearly parallel to each other, forming a dihedral angle of 3.7 (1)°, and adopt a staggered conformation. The amide group is almost perpendicular to the plane of the substituted Cp ring, with a C—N—C—C torsion angle of 101.3 (2)°, and the N and O atoms in the ethanoyl group are coplanar, with a C—N—C—O torsion angle of −0.7 (3)°. Weak C—H⋯O hydrogen bonds link adjacent mol­ecules.

Seven novel ferrocene derivatives containing (methylamino)benzonitrile and Nmethylnitroaniline groups (3a-3f and 4) have been synthesized by conventional methods and characterized by FT-IR, NMR and cyclic voltammetry. The electrochemical behavior of these compounds (3a-3f) has been studied by cyclic voltammetry measurements at a platinum electrode in acetonitrile/0.1 M TBAP. The ferrocenyl group in all compounds showed similar reversible oneelectron redox process, suggesting that the ferrocene moieties are equivalent and that there are no interactions among them. The formal potential, , is shifted to the more positive potential, indicating that the (methylamino)benzonitrile and N-methylnitroaniline introduced to ferrocene moiety exercise an electron-withdrawing effect.

Seven novel ferrocene derivatives containing (methylamino)benzonitrile and N-methylnitroaniline groups (3a-3f and 4) have been synthesized by conventional methods and characterized by FT-IR, NMR and cyclic voltammetry. The electrochemical behavior of these compounds (3a-3f) has been studied by cyclic voltammetry measurements at a platinum electrode in acetonitrile/0.1 M TBAP. The ferrocenyl group in all compounds showed similar reversible one-electron redox process, suggesting that the ferrocene moieties are equivalent and that there are no interactions among them. The formal potential, , is shifted to the more positive potential, indicating that the (methylamino)benzonitrile and N-methylnitroaniline introduced to ferrocene moiety exercise an electron-withdrawing effect.

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.