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Alkali Earth MOx (x=6, 7, 9, 12) Polyhedra Tuned Cadmium Selenites with Different Dimensions and Diverse SeO32-Coordinations

Abstract

A series of alkali earth cadmium selenites including MgCd3(SeO3)4 (1), Ca0.7Cd2.3(SeO3)3 (2), SrCd(SeO3)2 (3) and BaCd(SeO3)2 (4) are synthesized by hydrothermal reaction and studied in detail by single crystal and powdered X-ray diffractions, thermal analyses, IR and UV spectra and dipole moment calculation. 1 features a 3D anionic [Cd3(SeO3)4]2- framework constructed by isolated SeO3 trigonal pyramids and 2D [Cd3O12]n layers in which the [Cd3O12]n layer is composed of edge-shared [Cd2O10]16- dimmers and butterfly-like [Cd4O20]32- tetramers. 2 shows a smooth 2D [Cd2(SeO3)3]n layer composed of unique [Cd(SeO3)]n double chains. 3 exhibits a wavelike 2D [Cd(SeO3)2]n layer constructed by corner-shared CdO6 octahedra and isolated SeO3 trigonal pyramids. 4 displays a windmill-like 1D [Cd(SeO3)2]n chain built by zigzag [CdO4]n chain motifs and isolated SeO3 trigonal pyramids. The alkali earth oxide motifs demonstrate interesting and regular changes from isolated MgO6 octahedra, CaO7 polyhedra, SrO9 tri-capped trigonal prisms based on ribbon to BaO12 icosahedra based on Brucite-like layer, and meanwhile the SeO3 groups are observed from variable tetradentate to hexadentate coordination modes. These flexible motifs reveal that the cadmium selenites are strongly affected by alkali earth cation size, which provides a feasible approach to modulate the space structure via a selection of template cation.

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Publication details

The article was received on 10 Aug 2017, accepted on 02 Oct 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7CE01461A
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Alkali Earth MOx (x=6, 7, 9, 12) Polyhedra Tuned Cadmium Selenites with Different Dimensions and Diverse SeO32-Coordinations

    Y. Jia, Y. Chen, X. Yao and X. Zhang, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01461A

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