Crystal structures and Hirshfeld surface analysis of 5-amino-1-(4-methoxyphenyl)pyrazole-4-carb-oxylic acid and 5-amino-3-(4-methoxyphenyl)isoxazole.

The title compounds, C11H11N3O3, (I), and C10H10N2O2, (II), are commercially available and were crystallized from ethyl acetate solution. The dihedral angle between the pyrazole and phenyl rings in (I) is 52.34 (7)° and the equivalent angle between the isoxazole and phenyl rings in (II) is 7.30 (13)°. In the crystal of (I), the mol­ecules form carb­oxy­lic acid inversion dimers with an R(8) ring motif via pairwise O--H···O hydrogen bonds. In the crystal of (II), the mol­ecules are linked via N--H···N hydrogen bonds forming chains propagating along [010] with a C(5) motif. A weak N--H···π inter­action also features in the packing of (II). Hirshfeld surface analysis was used to explore the inter­molecular contacts in the crystals of both title compounds: the most important contacts for (I) are H···H (41.5%) and O···H/H···O (22.4%). For (II), the most significant contact percentages are H···H (36.1%) followed by C···H/H···C (31.3%). [ABSTRACT FROM AUTHOR]