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Acta Cryst. (2013). E69, o187
[ doi:10.1107/S1600536812050854 ]

(E)-3-Amino-4-(2-phenylhydrazinylidene)-1H-pyrazol-5(4H)-one

G. H. Elgemeie, S. H. Sayed and P. G. Jones

Abstract: The molecule of the title compound, C9H9N5O, is essentially planar (r.m.s. deviation of all atoms = 0.02 Å) except for the NH2 H atoms. An intramolecular hydrazinylidene-carbonyl N-H...O=C hydrogen bond is present. In the crystal, molecules are connected via N-H...N/O hydrogen bonds, forming thick layers parallel to (100).


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