Structure of 3-methoxycarbonyl-1-methyl-4-nitropyrazole-5-carboxylic acid monohydrate

Abstract

C7H7N3O6.H2O, M(r) = 247.16, orthorhombic, Fdd2, a = 31.535 (8), b = 14,313 (5), c = 9.446 (3) angstrom, Z = 16, V = 4263.6 angstrom3, D(x) = 1.54 g cm-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 1.31 cm-1 F(000) = 2048, room temperature, final R = 0.0368 for 1223 observed reflections. The pyrazole ring is planar. The methoxycarbonyl, nitro and acid groups make angles of 8.1, 74.5 and 16.7-degrees, respectively, with the pyrazole ring. The water of crystallization forms strong hydrogen bonds with the acid proton of one molecule and the unsubstituted pyrazole N atom of a symmetry-related molecule.