5-Amino-1H-1,2,4-triazol-4-ium hydrogen oxalate

Abstract

In the title salt, C2H5N4+·C2HO4−, the hydrogen oxalate anions form corrugated chains parallel to the c axis, linked by intermolecular O—H...O hydrogen bonds. The 5-amino-1H-1,2,4-triazol-4-ium cations are connected into centrosymmetric clusters via weak C—H...N hydrogen bonds forming nine-membered rings with an R33(9) motif. These clusters are interconnected via anions through N—H...O hydrogen bonds, building a three-dimensional network.