5-Bromo­benzene-1,3-dicarbo­nitrile

The asymmetric unit of the title compound, C₈H₃BrN₂, consists of two mol­ecules. The crystal structure features undulating mol­ecular sheets with the mol­ecules linked by C—H...N hydrogen bonds with one N atom acting as a bifurcated acceptor. N...Br inter­actions also occur [N...Br = 2.991 (3) and 3.099 (3) Å]. Inter­layer association is accomplished by offset face-to-face arene inter­actions [centroid–centroid distance = 3.768 (4) Å].

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

In the title compound, C₁₈H₁₄NO₃⁺·Cl⁻·CH₃CH₂OH, 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.