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.
Highlights
The principal building units in the crystal structure of ammonium aquabis(sulfato)lanthanate(III) are slightly distorted SO4 tetrahedra, LaO9 polyhedra 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
The disordered ammonium cations are situated in the cavities of this framework and are hydrogen-bonded to six surrounding O atoms
Summary
Three-dimensional framework materials are characterized by their structural diversity They are of continuing interest as a result of their technologically important properties and potential applications in catalysis, ion-exchange, adsorption, intercalation, and radioactive waste remediation (Szostak, 1989; Cheetham et al, 1999; Rosi et al, 2003; Ok et al, 2007). Lanthanide ions) ratio of 1:1 are one of the best investigated groups among hydrous ternary sulfates They crystallize either as monohydrates (Blackburn & Gerkin, 1995; Barnes, 1995; Iskhakova et al, 1985a) or tetrahydrates (Eriksson et al., 1974), and in few cases as dihydrates (Kaučič et al, 1985; Iskhakova & Trunov, 1985). For the smaller A+ ions such as Na+, the monohydrate becomes dominant
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