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Inicio » Actividades I+D > Publicaciones 2014 > On substituted pyrazole derivatives. I. ...
artículo con referato
"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"
Luis Alvarez-Thon, Carlos Bustos, Elies Molins, Maria Teresa Garland and Ricardo Baggio
Acta Cryst. C 70(9) (2014) 837-842
The title substituted pyrazole derivatives, C17H15N5O3 and C18H15F3N4O, share most of their molecular features, in particular the hydrazinylidene (–HN–N=) rather than the diazene (–N=N–) tautomeric form, and differ only in the substituents (NO2 and CF3) on one of the outer phenyl rings. The molecular units are basically planar, with the rotation of the phenyl rings being hindered by the presence of two intramolecular hydrogen bonds having the keto O atom as acceptor. In both structures, the packing is governed by weak C–HO, C–Hπ and ππ interactions. The subtle way in which minor structural differences lead to rather different supramolecular structures is analysed.
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