artículo con referato
"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"
Luis Alvarez-Thon, Carlos Bustos, Katherina Espinoza-Santibañez, María Teresa Garland and Ricardo Baggio
Acta Cryst. C 69(10) (2013) 1200-1204
Abstract
The title compound, C17H11F5N4O, 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).
DEPARTAMENTO FISICA DE LA MATERIA CONDENSADA