Ammonium sodium fluorotrioxophosphate monohydrate

In the title compound, (NH 4 )Na(PO 3 F)·H 2 O, the distances and the angles are normal. Na is coordinated in a distorted octahedral environment by one F atom, four anion O atoms and one water O atom. Fluorine, as in other structures, is not involved in two-centre hydrogen bonds. There are two-centre O—H...O and two- and three-centre N—H...O hydrogen bonds in the crystal structure.