1,4-Dimethyl­piperazin-1-ium 3-hy­droxy-2-naphtho­ate

The reaction of 1,4-dimethyl­piperazine and 3-hy­droxy-2-naphthoic acid gives the title 1:1 salt, C₆H₁₅N₂⁺·C₁₁H₇O₃⁻, with a singly protonated piperazinium cation. In the crystal, a single N—H...O hydrogen bond links the cations and anions into discrete pairs and the aromatic anions stack along the crystallographic a-axis direction. This results in layers of cations and anions alternating along the crystallographic c-axis direction. An intra­molecular O—H...O hydrogen bond is also present.