Crystal structure of NH4[La(SO4)2(H2O)]

Abstract

The principal building units in the crystal structure of ammonium aquabis(sulfato)lanthanate(III) are slightly distorted SO4tetrahedra, LaO9polyhedra in the form of distorted tricapped trigonal prisms, and NH4+ions. The La3+cation is coordinated by eight O atoms from six different sulfate tetrahedra, two of which are bidentate coordinating and four monodentate, as well as one O atom from a water molecule; each sulfate anion bridges three La3+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 interactions. The disordered ammonium cations are situated in the cavities of this framework and are hydrogen-bonded to six surrounding O atoms.