Two anilinium salts: anilinium hydrogenphosphite and anilinium hydrogenoxalate hemihydrate

In the title compounds, C6H5NH3+. H2PO3- and C6H5NH3+.-C2HO4-. 0.5H(2)O, th e NH3+ groups of the anilinium ion are ordered at room temperature. The rot ation of these groups along the N-C-aryl bond, which is often observed at r oom temperature in other anilinium compounds, is prevented by hydrogen bond s between the NH3+ group and the anions. In both compounds, the geometry of the cation is significantly distorted from D-6h to a symmetry close to C-2 v. The angle ipso to the substituent is significantly larger than 120 degre es, as expected from the sigma-electron-withdrawing character of the NH3+ g roup.