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The First Rare-Earth Metal Telluride Chlorides, RTeCl (R = La, Ce, Pr, Nd)

Authors

  • Markus Larres,

    1. Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstraße 6, 50939 Köln, Germany
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  • Ingo Pantenburg,

    1. Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstraße 6, 50939 Köln, Germany
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  • Gerd Meyer

    Corresponding author
    1. Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstraße 6, 50939 Köln, Germany
    • Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstraße 6, 50939 Köln, Germany, Fax: +49-221-470-5083

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

Abstract

The first rare-earth metal telluride chlorides, RTeCl with R = La, Ce, Pr, Nd, were obtained as single crystals and/or powder samples by the reaction of anhydrous rare-earth trichlorides, RCl3, with the respective rare-earth metals R and elemental tellurium (Te) in sealed tantalum containers at temperatures as high as 1050 °C. All four telluride-chlorides crystallize with the so-called tetragonal PbFCl type of structure but according to RTeCl = PbClF, with, for the example of LaTeCl-I, a = 451.7(1), c = 827.4(2) pm, VE/Z = 84.5(1) Å3, tetragonal, P4/nnm (No. 129). LaTeCl and CeTeCl are dimorphic, the second modification crystallizes with the PbCl2 type of structure with, for LaTeCl-II, a = 795.2(1), b = 450.8(1), c = 940.4(1) pm, VE/Z = 84.3(1) Å3, orthorhombic, Pnma (No. 62). In both structures, La3+ is nine-coordinate, [LaTe5Cl4], with similar mean La–Te and La–Cl distances in both modifications, 333.2 vs. 333.1 pm and 302.9 vs. 301.8 pm, respectively.

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