3,5-Dimethyl-4-[(E)-(2-nitro­phenyl)diazenyl]-1-(2,3,4,5,6-penta­fluoro­phenyl)-1H-pyrazole

The title compound, C₁₇H₁₀F₅N₅O₂, is described and com­pared with its 4-nitro­phenyl isomer [Bustos, Sánchez, Schott, Alvarez-Thon & Fuentealba (2007). Acta Cryst. E63, o1138–o1139]. The title mol­ecule presents its nitro group split into two rotationally disordered components, which in conjunction with the rotation of the `unclamped' rings constitute the main mol­ecular differences. Packing is directed by a head-to-tail type `I' C—F...F—C inter­action, generating double-chain strips running along [100]. These substructures are inter­linked by a variety of weak F...F, O...F, F...π and O...π inter­actions.

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

In the title compound, there are two independent mol­ecules forming hydrogen- and π-bonded dimeric entities with a noticeable noncrystallographic C₂ symmetry. Dimers are linked by medium-strength type-I C—F...F—C inter­actions, forming elongated tetra­mers.