(E)-2-[2-(4-Carb­oxy­phen­yl)ethen­yl]-8-hydroxy­quinolin-1-ium chloride ethanol monosolvate

In the title compound, C(18)H(14)NO(3) (+)·Cl(−)·CH(3)CH(2)OH, the dihedral angle formed by the mean planes of the quinolinium and benzene rings is 3.4 (1)°, while the carb­oxy substituent is tilted at an angle of 4.8 (1)° with respect to the benzene ring. There is a short N—H⋯O contact in the cation. In the crystal, due to the planar mol­ecular geometry, two-dimensional aggregates are formed parallel to (221) via C—H⋯O, C—H⋯Cl, O—H⋯Cl and N—H⋯Cl hydrogen bonds. Inter­layer association is accomplished by O—H(ethanol)⋯Cl and O—H⋯O(ethanol) hydrogen bonds and π–π stacking inter­actions [centroid–centroid distances vary from 3.6477 (12) to 3.8381 (11) Å]. A supra­molecular three-dimensional architecture results from a stacked arrangement of layers comprising the ionic and hydrogen-bonded components.