One-dimensional hydrogen-bonded structures in the 1:1 proton-transfer compounds of 4,5-dichlorophthalic acid with 8-hydroxyquinoline, 8-aminoquinoline and quinoline-2-carboxylic acid (quinaldic acid)

Abstract

The structures of the 1:1 proton-transfer compounds of 4,5-di-chloro- phthalic acid with 8-hydroxy-quinoline, 8-amino-quinoline and quinoline-2-carboxylic acid (quinaldic acid), namely anhydrous 8-hydroxy-quinolinium 2-carb-oxy-4,5-di-chloro-benzoate, C9H8NO +·C8H3Cl2O4 -, (I), 8-amino-quino-lin-ium 2-carb-oxy-4,5-dichloro-benzoate, C9H9N2 +·C8H3Cl2O4 -, (II), and the adduct hydrate 2-car-boxy-quino-linium 2-car-boxy-4,5-dichloro-benzoate quinolinium-2-car-box-yl-ate mono-hy-drate, C10H8NO2 +·C8H3Cl2O4 -·C10H7NO2·H2O, (III), have been determined at 130 K. Compounds (I) and (II) are isomorphous and all three compounds have one-dimensional hydrogen-bonded chain structures, formed in (I) throug..