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The structure of the title salt, C 13 H 20 N 3 O + ·0.94ClO 4− ·0.06Cl − , contains a zwitterionic Schiff base with a net positive charge and a perchlorate anion having substitutional disorder with Cl. In the cation, the azomethine N atom is protonated and donates hydrogen bonds to the phenolate O atom and to the tertiary N atom of the piperazine ring. In the crystal, two Schiff base mol­ecules are linked about a center of inversion by a pair of N—H⋯O hydrogen bonds. The resulting dimers are N—H⋯O and C—H⋯O hydrogen bonded to the perchlorate anions, forming a three-dimensional structure. The network is further consolidated by C—H⋯π inter­actions.

2-{[2-(Piperazin-4-ium-1-yl)ethyliminio]methyl}phenolate 0.06-chloride 0.94-perchlorate