RESUMEN
The reaction of 8-amino-quinoline, zinc chloride and hydro-chloric acid in ethanol yielded the title salt, (C9H10N2)[ZnCl4], which consists of a planar 8-aza-n-ium-yl-quinolinium dication and a tetra-hedral tetra-chloro-zincate dianion. The 8-amino-quinoline moiety is protonated at both the amino and the ring N atoms. In the crystal, the cations and anions are connected by inter-molecular N-Hâ¯Cl and C-Hâ¯Cl hydrogen bonds, forming sheets parallel to (001). Adjacent sheets are linked through π-π inter-actions involving the pyridine and arene rings of the 8-aza-niumylquinolinium dication. Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from Hâ¯Cl (48.1%), Hâ¯H (19.9%), Hâ¯C/Câ¯H (14.3%) (involving the cations) and Hâ¯Cl (82.6%) (involving the anions) interactions.