On substituted pyrazole derivatives. I. 3-Methyl-4-[(Z)-2-(4-methyl­phenyl)hydrazin-1-yl­idene]-1-(3-nitro­phenyl)-1H-pyrazol-5(4H)-one and 3-methyl-4-[(Z)-2-(4-methyl­phenyl)hydrazin-1-yl­idene]-1-[4-(tri­fluoro­methyl)phenyl]-1H-pyrazol-5(4H)-one

The title substituted pyrazolone compounds, one of them presenting two mol­ecules in the asymmetric unit, differ in the substituents on two terminal benzene rings. The three-dimensional supra­molecular structure is achieved in both cases via a number of C-H...O, C-H...[pi] and [pi]-[pi] weak inter­actions, linking the mol­ecules into more or less compact supra­molecular structures.