Received 10 April 2013
Single crystals of decalanthanum(III) dodecaoxotellurate(IV), La10Te12O39, were obtained by reacting La2O3 and TeO2 in a CsCl flux. Its crystal structure can be viewed as a three-dimensional network of corner- and edge-sharing LaO8 polyhedra with TeIV atoms filling the interstitial sites. The TeIV atoms with their 5s2 electron lone pairs distort the LaO8 polyhedra through variable Te-O bonds. Among the six unique Te sites, four of them define empty channels extending parallel to the a axis. The formation of these channels is a result of the stereochemically active electron lone pairs on the TeIV atoms. The atomic arrangement of the Te-O units can be understood on the basis of the valence shell electron pair repulsion (VSEPR) model. A certain degree of disorder is observed in the crystal structure. As a result, one of the five different La sites is split into two positions with an occupancy ratio of 0.875 (2):0.125 (2). Also, one of the oxygen sites is split into two positions in a 0.559 (13):0.441 (13) ratio, and one O site is half-occupied. Such disorder was observed in all measured La10Te12O39 crystals.
For the structures of related rare-earth oxotellurates(IV), see: Castro et al. (1990); Weber et al. (2001); Meier et al. (2009). For synthetic details, see: Weber & Schleid (2000). For standardization of structural data, see: Gelato & Parthé (1987). For the VSEPR model, see: Gillespie (1970). For the bond-valence method, see: Brown (2009).
Data collection: X-AREA (Stoe, 2004); cell refinement: X-AREA; data reduction: X-RED32 (Stoe, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Crystal Impact, 2008); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WM2737 ).
This work was supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada and by a grant from the ACS Petroleum Research Fund.
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