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. 2008 Jun 21;64(Pt 7):o1312-3.
doi: 10.1107/S1600536808018394.

5-Amino-1-phenyl-1H-pyrazole-4-carboxylic acid

Muhammad Zia-Ur-Rehman, Mark R J Elsegood, Nosheen Akbar, Rahman Shah Zaib Saleem

5-Amino-1-phenyl-1H-pyrazole-4-carboxylic acid

Muhammad Zia-Ur-Rehman et al. Acta Crystallogr Sect E Struct Rep Online. .

Abstract

In the mol-ecule of the title compound, C(10)H(9)N(3)O(2), the pyrazole ring is approximately coplanar with the amino and carboxyl groups. The phenyl group is twisted by 48.13 (3)° relative to this plane. An intra-molecular N-H⋯O hydrogen bond stabilizes the planar conformation of the mol-ecule. The mol-ecules are linked into two-dimensional sheets by two strong inter-molecular N-H⋯N and O-H⋯O hydrogen bonds. The latter forms the classic carboxylic acid dimer motif.

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Figures

Fig. 1.
Fig. 1.
The asymmetric unit of the title compound. Displacement ellipsoids are drawn at the 50% probability level.
Fig. 2.
Fig. 2.
Perspective view of the crystal packing showing hydrogen-bond interactions (dashed lines). H atoms not involved in hydrogen bonding have been omitted for clarity.
See this image and copyright information in PMC

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