title: Crystal structure of tris-(hydroxyl-ammonium) orthophosphate.
abstract: The crystal structure of the title salt, ([H3NOH](+))3·[PO4](3-), consists of discrete hydroxyl-ammonium cations and ortho-phos-phate anions. The atoms of the cation occupy general positions, whereas the anion is located on a threefold rotation axis that runs through the phospho-rus atom and one of the phosphate O atoms. In the crystal structure, cations and anions are linked by inter-molecular O-H⋯O and N-H⋯O hydrogen bonds into a three-dimensional network. Altogether, one very strong O-H⋯O, two N-H⋯O hydrogen bonds of medium strength and two weaker bifurcated N-H⋯O inter-actions are observed.
authors.affiliation: Dräger Safety AG & Co. KGaA, Revalstrasse 1, 23560 Lübeck, Germany.
authors.forename: Malte
authors.initials: M
authors.lastname: Leinemann
authors.affiliation: Institut für Anorganische Chemie, Christian-Albrechts-Universität Kiel, Max-Eyth-Str. 2, 24118 Kiel, Germany.
authors.forename: Inke
authors.initials: I
authors.lastname: Jess
authors.affiliation: Dräger Safety AG & Co. KGaA, Revalstrasse 1, 23560 Lübeck, Germany.
authors.forename: Jan
authors.initials: J
authors.lastname: Boeckmann
authors.affiliation: Institut für Anorganische Chemie, Christian-Albrechts-Universität Kiel, Max-Eyth-Str. 2, 24118 Kiel, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Näther
keywords: crystal structure; hydrogen bonding; hydroxyl­ammonium salt