(E)-N-[4-(Di-ethyl-amino)-2-hy-droxy-benzyl-idene]-2,4,6-tri-methyl-benzenaminium nitrate.

The crystal structure of the title salt, C(20)H(27)N(2)O(+)·NO(3) (-), has a cationic (E)-mesityl-N-[4-(di-ethyl-amino)-benzyl-idene]benzenaminium species and a nitrate counter-ion in the asymmetric-unit. In the crystal, alternating inter-molecular O-H⋯O and C-H⋯O hydrogen-bonding occurs between neighbouring protonated Schiff bases and nitrate ions within a supra-molecular, chain-like architecture that extends along the crystallographic b-axis direction.