Pyridine-2-carboxamidrazonium hydrogenoxalate

Abstract

In the title structure, C6H9N4+·C2HO4−, there are O—H⋯O, N—H⋯N and N—H⋯O hydrogen bonds that form a three-dimensional network. The hydrogenoxalate anions are bonded by O—H⋯O hydrogen bonds to form chains parallel to the b axis. The pyridine-2-carboxamidrazonium cations are linked by the N—H⋯N bonds into dimeric centrosymmetric entities with an R22(10) motif. These dimers are connected to hydrogenoxalates via N—H⋯O hydrogen bonds. In addition, there is a weak C—H⋯O hydrogen bond, as well as a C—H⋯π inter­action with the 2-pyridyl ring [C—H⋯Cg: C—H = 0.93 Å, H⋯Cg = 2.90 Å, C⋯Cg = 3.581 (3) Å and C—H⋯Cg = 131°; Cg is the centroid of the 2-pyridyl ring at ({1\over 2} − x, −{1\over 2} + y, {3\over 2} − z)]. It is inter­esting to note that the two NH2 groups in the structure occur both in planar and pyramidal arrangements.