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Crystal structure of Sr(5)Te(4)O(12)(OH)(2), the first basic strontium oxotellurate(IV)
The asymmetric unit of the title basic strontium oxotellurate(IV), Sr(5)Te(4)O(12)(OH)(2) {systematic name pentastrontium tetrakis[oxotellurate(IV)] dihydroxide}, comprises three Sr(II) cations (one with site symmetry 2) and two Te(IV) atoms, as well as seven O atoms. The coordination numbers of...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
International Union of Crystallography
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5095826/ https://www.ncbi.nlm.nih.gov/pubmed/27840701 http://dx.doi.org/10.1107/S2056989016015577 |
Sumario: | The asymmetric unit of the title basic strontium oxotellurate(IV), Sr(5)Te(4)O(12)(OH)(2) {systematic name pentastrontium tetrakis[oxotellurate(IV)] dihydroxide}, comprises three Sr(II) cations (one with site symmetry 2) and two Te(IV) atoms, as well as seven O atoms. The coordination numbers of the alkaline earth cations to nearby O atoms range from seven (2 ×) to eight, and the Te(IV) atoms are surrounded by three oxygen partners in the form of trigonal pyramids. The SrO(x) polyhedra share corners and edges to build up a three-dimensional framework structure encapsulating channels propagating along [010]. The Te(IV) atoms flank the framework O atoms and are situated at the outer array of the channels with the 5s (2) lone electron pairs protruding into the empty space of the channels (diameter ≃ 4 Å). Although the H atom of the OH group could not be located, bond-valence-sum calculations and typical O⋯O distances (range 2.81–3.06 Å) clearly indicate hydrogen bonding of medium to weak strengths. |
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