The asymmetric unit of the title hybrid compound, (C9H8N)[FeCl4]Cl, comprises a tetrahedral tetrachloridoferrate(III) anion, [FeCl4]−, a Cl− anion and two quinolinium cations. There are N—H⋯Cl hydrogen-bonding interactions between the protonated N atoms of the quinolinium cations and the chloride anion, which together with π–π stacking between adjacent quinolinium rings [centroid-to-centroid distances between C6 and C5N rings in adjacent stacked quinolinium cations of 3.609 (2) and 3.802 (2) Å] serve to hold the structure together.
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