Crystal structure of 4-(2-meth­oxy­phen­yl)piper­azin-1-ium 3,5-dintrosalicylate

The title salt [systematic name: 4-(2-methoxyphenyl)piperazin-1-ium 2-carboxy-4,6-dinitrophenolate], C(11)H(17)N(2)O(+)·C(7)H(3)N(2)O(7) (−), exhibits secondary nitro­gen atoms (N—H) in the 2-meth­oxy­phenyl­piperazine (2MeOPP) cation, which is protonated with a phenolic hydrogen atom of 3,5-di­nitro­salicylic acid (DNSA). One of the oxygen atoms of the nitro group in the 3,5-di­nitro­salicylate anion is disordered over two orientations with occupancy factors of 0.65 (7) and 0.35 (7) . The 2-meth­­oxy­phenyl­piperazinium cation and 3,5-di­nitro­salicylate anion are linked in the asymmetric unit by a bifurcated N—H⋯O hydrogen bond, which formed is between the H atom in the protonated piperazinium unit of the cation and the carb­oxy­lic acid group in the anion. The piperazine ring adopts a chair conformation. The crystal structure features N—H⋯O and C—H⋯O hydrogen bonds inter­actions, which lead to the formation of a sandwich-like arrangement. Hirshfeld surface analysis was used to determine the relative contributions of various inter­molecular inter­actions, indicating that that H⋯O/O⋯H (38. 3%) and H⋯H (31. 8%) contacts are the major contributors.