Premium
The First Rare‐Earth Metal Telluride Chlorides, R TeCl ( R = La, Ce, Pr, Nd)
Author(s) -
Larres Markus,
Pantenburg Ingo,
Meyer Gerd
Publication year - 2013
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300406
Subject(s) - telluride , orthorhombic crystal system , tetragonal crystal system , rare earth , chemistry , crystallography , tantalum , anhydrous , tellurium , metal , inorganic chemistry , crystal structure , mineralogy , organic chemistry
Abstract The first rare‐earth metal telluride chlorides, R TeCl with R = La, Ce, Pr, Nd, were obtained as single crystals and/or powder samples by the reaction of anhydrous rare‐earth trichlorides, R Cl 3 , 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 R TeCl = PbClF, with, for the example of LaTeCl‐I, a = 451.7(1), c = 827.4(2) pm, V E /Z = 84.5(1) Å 3 , tetragonal, P 4/ nnm (No. 129). LaTeCl and CeTeCl are dimorphic, the second modification crystallizes with the PbCl 2 type of structure with, for LaTeCl‐II, a = 795.2(1), b = 450.8(1), c = 940.4(1) pm, V E /Z = 84.3(1) Å 3 , orthorhombic, Pnma (No. 62). In both structures, La 3+ is nine‐coordinate, [LaTe 5 Cl 4 ], 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.