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The title compound, [Fe(C5H5)(C15H14NO2)], is a monoclinic polymorph of the previously reported triclinic form [Shi et al. (2006). Acta Cryst. C62, m407–m410]. The polymorphs feature the same strong intramolecular N—H...O=C hydrogen bonds, but show different packing modes. The molecules in the monoclinic form associate into double chains via O—H...O=C and (Cp)C—H...O—H interactions.

The title compound, [Fe4(C6H6NS)(CH3S)S(CO)11], comprises two butterfly-shaped sub-cluster cores, Fe2S2N and Fe2S2, joined together by a spiro-type μ4-S atom. The (pyridin-2-yl)methanethiolate ligand is attached to the Fe2(CO)5 unit in a μ-κN:κ2S mode, and the methanethiolate ligand is coordinated to the Fe2(CO)6 unit in a μ-κ2S fashion.

The title compound, [Fe(C11H11N2O)2], crystallizes with two independent molecules in the asymmetric unit which have have different conformations. In one molecule, the two ferrocene cyclopentadienyl rings are fully eclipsed and the two pyrazole rings are syn to each other; in the other, the two cyclopentadienyl rings are synclinal and the pyrazole rings are anti. In both molecules, the acetyl group attached to the pyrazole ring is oriented away from the iron–cyclopentadienyl group of ferrocene.