Acta Cryst. (2013). C69, 1200-1204 [ doi:10.1107/S0108270113024943 ]
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-HO hydrogen bonds and - interactions into dimeric entities, presenting a noticeable noncrystallographic C2 symmetry. These dimers are in turn linked by a medium-strength type-I C-FF-C interaction into elongated tetramers. Much weaker C-HF contacts link the tetramers into broad two-dimensional substructures parallel to (101).
Keywords: crystal structure; pyrazole derivatives; noncrystallographic symmetry; type-I C-FF-C contacts.
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