Publication Date:
2013-10-30
Description:
By fusing Lu 2 O 3 and TeO 2 in a molar ratio of 1:3 in a CsCl flux, colorless single crystals of the lutetium(III) oxotellurate(IV) Lu 2 Te 3 O 9 could be obtained as first representative of the structurally so far unknown C -type for the composition M 2 Te 3 O 9 . The title compound crystallizes triclinically in space group P with a = 689.67(4) pm, b = 1320.91(8) pm, c = 1450.06(9) pm, α = 110.057(3)°, β = 90.606(3)°, γ = 100.125(3)°, and Z = 6. The crystal structure contains six different Lu 3+ cations in eightfold (Lu1 and Lu2: trigonal dodecahedra) and sevenfold (Lu3 and Lu6: monocapped trigonal prisms; Lu4 and Lu5: pentagonal bipyramids) oxygen coordination. These lutetium–oxygen polyhedra ( d (Lu–O) = 214–274 pm) are condensed to serrated layers according to 2 ∞ {[Lu 6 O 26 ] 34– } that are stacked along [100]. The oxotellurate(IV) partial structure consists of basically nine crystallographically independent [TeO 3 ] 2– ( d (Te–O) = 184–196 pm) units connecting the above-mentioned layers to a three-dimensional framework. Strong secondary Te 4+ ··· O 2– interactions between adjacent [TeO 3 ] 2– entities as common feature in the crystal structures of all known ternary lanthanoid(III) oxotellurates(IV) are also present in the crystal structure of Lu 2 Te 3 O 9 . Depending upon the range of these secondary contacts taken into account, the [TeO 3 ] 2– units are linked to form one-dimensional strands ( d (Te ··· O) = 237–272 pm) like in B -type Dy 2 Te 3 O 9 or even two-dimensional layers emerge ( d (Te ··· O) = 237–285 pm).
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
Permalink