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The molecular structures of chloride salts of 2- and 5-substituted derivatives of 8-hydroxyquinoline, Me–H 2 Q + ·Cl –  ([C 10 H 10 NO]Cl) and Cl–H 2 Q + ·Cl –  ([C 9 H 7 ClNO] + ·Cl – ), were determined by single crystal X-ray diffraction methods; the latter is a new polymorph. In the crystal structures of these salts, several intra- and inter-molecular interactions result in a step-shaped centrosymmetricR  4  4   (  8  )    $R_4^4(8)$    ring. Unlike most quinolinium salts, there was no solvent present in these structures. Protonation of the quinoline N atom had an effect on the N···O bite distances and C–N–C angle and greater conjugation of the benzene ring with a hydroxyl group was also observed. π–π Interactions between each pair of quinolinium rings were observed in Me–H 2 Q + ·Cl –  but not in Cl–H 2 Q + ·Cl – . In addition, the quantum chemical calculations were performed on the new structures as well as similar compounds for comparison. The optimized structures were compared with the experimental observations for the effect of protonation and of hydrogen bonding interactions.

zeitschrift für kristallographie - crystalline materials

Formation of         R  4  4   (  8  )    $R_4^4(8)$    ring in chloride salts of 8-hydroxyquinolinium derivatives: synthesis, structural, and theoretical studies