%0 Journal Article %T Hydroxonium 1-ammonioethylidene-1,1-bisphosphonate %A Ying Wu %A Du-Lin Yin %J Acta Crystallographica Section E %D 2008 %I International Union of Crystallography %R 10.1107/s1600536808029565 %X The title compound, H3O+¡¤C2H8NO6P2 , contains a disordered H3O+ cation and an NH3C(CH3)(PO3H)2 anion. The three H atoms of the H3O+ cation are statistically distributed over four positions with occupancies of 0.75, resulting in a pseudo tetrahedron. Multiple N¡ªH...O and O¡ªH...O hydrogen bonds generate an intricate three-dimensional network. %U http://scripts.iucr.org/cgi-bin/paper?S1600536808029565