Hydrogen bonding in proton-transfer compounds of 5-sulfosalicylic acid with bicyclic heteroaromatic Lewis bases

Abstract

The crystal structures of quinolinium 3-carboxy-4-hydroxy-benzenesulfonate trihydrate, C9H8N+·C7H 5O6S-·3H2O, (I), 8-hydroxyquinolinium 3-carboxy-4-hydroxybenzenesulfonate monohydrate, C 9H8NO+·C7H5O 6S-C·H2O, (II), 8-amino-quinolinium 3-carboxy-4-hydroxybenzenesulfonate dihydrate, C9H9N 2+·C7H5O6S -·2H2O, (III), and 2-carboxyquinolinium 3-carboxy-4-hydroxybenzenesulfonate quinolinium-2-carboxylate, C 10H8NO2+·C7H 5O6S-·C10H7NO 2, (IV), four protontransfer compounds of 5-sulfosalicylic acid with bicyclic heteroaromatic Lewis bases, reveal in each the presence of variously hydrogen-bonded polymers. In only one of these compounds, viz. (II), is the protonated quinolinium group involved in a di..