Anhydrous quinolinium dihydrogen citrate

Abstract

In the title compound, C9H8N+·C6H7O7 -, the dihydrogen citrate anions form a convoluted two-dimensional hydrogen-bonded substructure through head-to-tail inter-actions with the inter-stitial π-stacked quinolinium cations linked to it peripherally through cyclic R 1 2(5) N+ - H⋯O(carbox-yl/hydrox-yl) hydrogen-bond inter-actions. The loss of a proton from one of the Β-carboxylic acid groups of the citric acid generates a chiral centre in the anion, but these form a racemate in the centrosymmetric crystal structure. © International Union of Crystallography 2007.