5-Amino-1H-pyrazol-2-ium hydrogen succinate

In the cation of the title salt, C(3)H(6)N(3) (+)·C(4)H(5)O(4) (−), the protonated pyrazolium ring is planar (r.m.s. deviation = 0.012 Å). An intra­molecular C—H⋯O hydrogen bond occurs in the anion. In the crystal, N—H⋯O hydrogen bonds and a weak C—H⋯O inter­action between the cations and anions form two sets of R (2) (2)(8) graph-set ring motifs. Inter­molecular O—H⋯O hydrogen bonds between these lead to a criss-cross pattern along the b axis. In addition to the classical hydrogen bonds, a weak C—H⋯π(pyrazolium) inter­action is observed and contributes to crystal packing. All of these inter­actions link the mol­ecules into a two-dimensional supra­molecular framework parallel to (10-1).