ChemInform Abstract: The First Rare‐Earth Metal Telluride Chlorides, RTeCl (R: La, Ce, Pr, Nd).

Abstract

The First Rare-Earth Metal Telluride Chlorides, RTeCl (R: La, Ce, Pr, Nd). -LnTeCl (Ln: La, Ce, Pr, Nd) compounds are obtained as single crystals and/or powder samples by the reaction of anhydrous LnCl3, Ln metal, and Te (sealed Ta tubes in evacuated silica tubes, 1050°C, 5 d, heating and cooling rate of 50 K/h). All compounds show the tetragonal PbFCl-type structure (space group P4/nnm, Z = 2, single crystal XRD). LaTeCl and CeTeCl are dimorphic with the second modification crystallizing in the PbCl2-type structure (orthorhombic, space group Pnma, Z = 4). In both structures La 3+ 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. -(LARRES, M.; PANTENBURG, I.; MEYER*, G.; Z. Anorg. Allg. Chem. 639 (2013) 15, 2744-2747, http://dx.