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In the title compound, [Fe(C5H5)(C16H15N2O)], the pyrazoline ring and the phenyl ring are nearly coplanar, making a dihedral angle of 6.54 (2)°, while the substituted cyclo­penta­dienyl ring is twisted out of the pyrazoline ring plane by 81.32 (1)°. The mol­ecules in the crystal structure are held together by weak C—H⋯O inter­molecular hydrogen bonds and two C—H⋯π inter­actions.

Two novel ferrocenyl substituted N-acetyl-2-pyrazolines, N-acetyl-3-(2-furyl)-5-ferrocenyl-2-pyrazoline (3) and N-acetyl-3-(2-thienyl)-5-ferrocenyl-2-pyrazoline (4), have been synthesized and characterized by FTIR, 1 H-NMR, 13 C-NMR techniques, elemental analysis and X-ray structure analysis. Thermal properties of these compounds have been determined by TGA, DTA and DSC analysis. Compound 3 (C 19 H 18 N 2 O 2 Fe) crystallizes in the monoclinic space group P21/c and Z = 4, with a = 8.6970(4) Å , b = 18.4725(9) Å , c = 11.0041(5) Å , b = 110.942(3)°.Compound 4 (C 19 H 18 N 2 OSFe) crystallizes in the orthorhombic space group Fdd2 and Z = 16, with a = 84.242(2) Å , b = 13.5416(5) Å , c = 5.9405(2) Å , b = 90°. In terms of crystal packing, each compound shows different molecular arrangement, which are stabilized by C-HÁÁÁO intermolecular weak hydrogen bonds, and/or C-HÁÁÁp interactions.

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