Crystal Structure Of NH4[La(SO4)2(H2O)] - PubMed

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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.

Keywords: crystal structure; hydrogen bonding; hydrous ternary sulfates; hydro­thermal synthesis.

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Figures

Figure 1

Figure 1

The principal building units, LaO …

Figure 1

The principal building units, LaO 9 polyhedra and SO 4 tetra­hedra, in the…

Figure 1 The principal building units, LaO9 polyhedra and SO4 tetra­hedra, in the crystal structure of (NH4)[La(SO4)2(H2O)], showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (i) 1 − x, −formula image + y, formula image − z; (ii) 1 − x, formula image + y, formula image − z; (iii) 1 − x, 2 − y, −z; (iv) 2 − x, 2 − y, 1 − z; (v) x, formula image − y, formula image + z.]
Figure 2

Figure 2

The connection of LaO 9 …

Figure 2

The connection of LaO 9 polyhedra and SO 4 tetra­hedra in the crystal…

Figure 2 The connection of LaO9 polyhedra and SO4 tetra­hedra in the crystal structure of (NH4)[La(SO4)2(H2O)], viewed along the a axis.
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References

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