International Union of Crystallography, Acta Crystallographica Section E: Structure Reports Online, 4(68), p. o959-o960, 2012
DOI: 10.1107/s1600536812008458
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In the title compound, C6H7ClN+·C4H3O4−, the cations and anions lie on mirror planes and hence only half of the molecules are present in the asymmeric unit. The 4-chloroanilinium cation and hydrogen maleate anion in the asymmetric unit are each planar and are oriented at an angle of 15.6 (1)° to one another and perpendicular to thebaxis. A characterestic intramolecular O—H...O hydrogen bond, forming an S(7) motif, is observed in the maleate anion. In the crystal, the cations and anions are linked by N—H...O hydrogen bonds, forming layers in theabplane. The aromatic rings of the cations are sandwiched between hydrogen-bonded chains and rings formed through the amine group of the cation and maleate anions, leading to alternate hydrophobic (z= 0 or 1) and hydrophilic layers (z= 1/2) along thecaxis.