Acta Crystallographica Section E (Sep 2010)
Ethyl 5-amino-1-(6-chloropyridazin-3-yl)-1H-pyrazole-4-carboxylate
Abstract
In the title compound, C10H10ClN5O2, the dihedral angle between the aromatic rings is 0.16 (9)°. Two S(6) ring motifs are formed due to intramolecular N—H...N and N—H...O hydrogen bonds. In the crystal, inversion dimers linked by pairs of N—H...N hydrogen bonds generate R22(14) [or R44(10) via the intramolecular hydrogen bonds] ring motifs. Polymeric chains propagating in [210] are formed as a result of interlinking the dimers by pairs of C—H...N interactions, completing R22(6) ring motifs.