Dimers linked by type-I C - F⋯F - C contacts in (Z)-3-methyl-4-[2- (4-methylphenyl)hydrazinylidene]-1-(pentafluorophenyl)-1H-pyrazol-5(4H)-one

The title compound, C₁₇H₁₁F₅N ₄O, is described and compared with two closely related analogues in the literature. There are two independent molecules in the asymmetric unit, linked by N - H⋯O hydrogen bonds and π-π interactions into dimeric entities, presenting a noticeable noncrystallographic C₂ symmetry. These dimers are in turn linked by a medium-strength type-I C - F⋯F - C interaction into elongated tetramers. Much weaker C - H⋯F contacts link the tetramers into broad two-dimensional substructures parallel to (101).