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 R 3 3(9) motif. These clusters are interconnected via anions through N - H⋯O hydrogen bonds, building a three-dimensional network.