T. Yamuna, M. Kaur, J. Jasinski
Aug 1, 2014
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Journal
Acta Crystallographica Section E: Structure Reports Online
Abstract
The title co-crystal, 3-(4-fluorophenyl)-1H-pyrazole–5-(4-fluorophenyl)-1H-pyrazole (1/1), C9H7FN2, crystallizes with four independent molecules (A, B, C and D) in the asymmetric unit exhibiting two tautomeric forms (A and D; B and C) due to N—H proton exchange between the two N atoms of the pyrazole ring. The dihedral angles between the mean planes of the pyrazole and benzene rings are 15.6 (1), 19.8 (9), 14.0 (1) and 10.7 (7)° in molecules A, B, C and D, respectively. In the crystal, N—H⋯N hydrogen bonds link the four molecules in the asymmetric unit into a ring with an R 4 4(12) motif. Furthermore, weak C—H⋯F interactions link the molecules into a three-dimensional network.