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Two New Cesium Thiotellurates: Cs2[TeS2] and Cs2[TeS3]

Authors

  • Jean-Marie Babo,

    1. Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556–5637, USA
    2. Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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  • Klaus K. Wolff,

    1. Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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  • Thomas Schleid

    Corresponding author
    1. Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
    • Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany, Fax: +49-711-685-64241

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  • Dedicated to Professor Wolfgang Bensch on the Occasion of His 60th Birthday

Abstract

Thermal decomposition of cesium azide (CsN3) leaves elemental cesium behind, which was in-situ produced and used for the syntheses of the two new cesium thiotellurates Cs2[TeS2] and Cs2[TeS3] along with appropriate amounts of tellurium and sulfur. The first compound crystallizes orthorhombically in space group Cmc21 with the lattice parameters a = 783.39(4), b = 1126.72(8), c = 823.04(5) pm (Z = 4) and the second one monoclinically in space group P21/n with the lattice parameters a = 997.12(6), b = 1269.71(8), c = 1410.23(9) pm, β = 91.218(3)° (Z = 8). While ψ1-tetrahedral complex thiotellurate(IV) anions [TeS3]2– are found as pyramids in Cs2[TeS3], Cs2[TeS2] comprises ψ2-tetrahedral thiotellurate(II) units [TeS2]2– as boomerangs and both occur isolated in the corresponding structures. In each of the title compounds, the anionic part of the structures is arranged layer-like with Cs+ cations sitting in between the layers. The cesium cations in the sulfur-rich compound Cs2[TeS3] exhibit coordination numbers of seven and eight, while in the Cs2[TeS2] these cations are surrounded by only six sulfide anions. But even the lone-pair electrons at the central Te4+ and Te2+ cations help to complete the Cs+ coordination spheres in both cases.

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