Abstract
Rare-earth(III) oxotellurates(IV) with the composition M2Te4O11 are known for yttrium and all lanthanides except promethium and lutetium from single-crystal X-ray structure determinations. Single crystals of the last missing non-radioactive isostructural compound, Lu2Te4O11, can now be obtained by modifying the common method of synthesis from the binary oxides (Lu2O3 and TeO2; 1:4 molar ratio) using torch-sealed non-evacuated silica ampoules as reaction containers. The structure contains layers of edge-sharing [LuO8] polyhedra connected by oxotellurate(IV) chains. These consist of [TeO3]2− and [Te2O5]2− anions (with ψ1-tetrahedral oxygen coordination for all central Te4+ cations) linked by strong secondary Te—O interactions.
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