title: Crystal structure of NH4[La(SO4)2(H2O)].
abstract: The principal building units in the crystal structure of ammonium aqua-bis(sulfato)-lanthanate(III) are slightly distorted SO4 tetra-hedra, LaO9 polyhedra in the form of distorted tricapped trigonal prisms, and NH4 (+) ions. The La(3+) cation is coordinated by eight O atoms from six different sulfate tetra-hedra, two of which are bidentate coordinating and four monodentate, as well as one O atom from a water mol-ecule; each sulfate anion bridges three La(3+) cations. These bridging modes result in the formation of a three-dimensional anionic [La(SO4)2(H2O)](-) framework that is stabilized by O-H⋯O hydrogen-bonding inter-actions. The disordered ammonium cations are situated in the cavities of this framework and are hydrogen-bonded to six surrounding O atoms.
authors.affiliation: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, Faculté des Sciences Exactes, Département de Chimie, Université de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Meriem
authors.initials: M
authors.lastname: Benslimane
authors.affiliation: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, Faculté des Sciences Exactes, Département de Chimie, Université de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Yasmine Kheira
authors.initials: YK
authors.lastname: Redjel
authors.affiliation: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, Faculté des Sciences Exactes, Département de Chimie, Université de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Hocine
authors.initials: H
authors.lastname: Merazig
authors.affiliation: Laboratoire de Chimie de Coordination, UPR-CNRS 8241, 05 route de Narbonne, 31077 Toulouse Cedex 4.
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Daran
keywords: crystal structure; hydrogen bonding; hydrous ternary sulfates; hydro­thermal synthesis