Hydrogen 4-ammoniophenylphosphonate

Abstract

The title compound, C6H8NO3P, is isostructural with p-arsanilic acid. It exists as the zwitterion H3N+C6H4PO3H−. In the crystal, molecules are linked by O—H...O and N—H...O hydrogen-bond bridges, giving a three-dimensional network structure. The strongest hydrogen bonds are formed between adjacent PO3H groups with O...O distances of 2.577 (2) Å.