N,N'-Butane­dioylbis(5-ferrocen­yl-3-meth­yl-1H-pyrazole)

The title compound, [Fe₂(C₅H₅)₂(C₂₂H₂₀N₄O₂)], has been synthesized by the reaction of ferrocenoylacetone and butane­dioic acid dihydrazide in ethanol. The dihedral angles between one pyrazole ring and the attached cyclopentadienyl ring and carbonyl plane are 33.5 (4) and 4.4 (8)°, respectively; for the other pyrazole ring, the corresponding angles are 29.5 (4) and 11.2 (8)°, respecively.

(Z)-1-Ferrocenyl-3-hydroxy-3-(2-pyrid­yl)prop-2-en-1-one

The title compound, [Fe(C₅H₅)(C₁₃H₁₀NO₂)], has been synthesized by the Claisen condensation reaction of acetyl­ferrocene and ethyl picolinate in the presence of sodium ethoxide. The enone structure is stabilized by a strong [OH...O=C] intra­molecular hydrogen bond.