Lutetium(III) oxotellurate(IV), Lu₂Te₄O₁₁

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.

New vanadium(IV) and titanium(IV) oxyfluorotellurates(IV): V2Te2O7F2and TiTeO3F2

“…Bridging [Te 2 O 5 ] units are also described in M 2 Te 4 O 11 (M = Lu, Y, La-Nd and Sm-Yb) (Hö ss et al, 2005;Castro et al, 1990;Weber et al, 2001;Ijjaali et al, 2003;Meier & Schleid, 2004;Shen & Mao, 2004). However, in Lu 2 Te 4 O 11 , for example, the Te-O-Te bridge angle (138.9 ) is significantly smaller than in either TiTeO 3 F 2 or V 2 Te 2 O 7 F 2 , and the [Te 2 O 5 ] units connect layers of edge-sharing LuO 8 polyhedra instead of chains of edge-sharing VO 4 F 2 octahedra.…”

New Crystal Structures of Rare‐Earth Metal(III) Oxotellurates(IV) RE2Te3O9: A1‐Type (RE=La, Ce) and A2‐Type (RE=Pr, Nd)

“…They are known with different compositions depending on the molar ratio RE 2 O 3 :TeO 2 , and their general formula can thus be described as RE 2 O 3 (TeO 2 ) n . Up to now many tellurium‐dioxide rich compounds, namely RE 2 Te 4 O 11 ( n =4; RE =Sc, Y, La−Lu) [19–27] and RE 2 Te 5 O 13 ( n =5; RE =Sc, Y, Dy−Lu), [26–30] have been structurally characterized. In contrast, for the composition RE 2 Te 3 O 9 ( n =3) rather few representatives are known so far and with n =2, only Pr 2 Te 2 O 7 was reported, which contains oxygen atoms not bonded to any Te 4+ cation according to Pr 2 O[TeO 3 ] 2 [31] .…”

Synthesis, crystal structures and luminescence properties of the Eu3+-doped yttrium oxotellurates(IV) Y2Te4O11 and Y2Te5O13

“…For n ¼ 4 this results in the composition M 2 Te 4 O 11 (M ¼ Y, La-Nd, Sm-Lu) [1][2][3][4][5][6][7], whereas n ¼ 5 leads to the formula type M 2 Te 5 O 13 (M ¼ Sc, Y, Dy-Lu) [2,[8][9][10]. Optical absorption and photoluminescence measurements of pure Nd 2 Te 4 O 11 , Pr 2 Te 4 O 11 and Eu 2 Te 4 O 11 , as well as Pr 3+ -and Eu 3+ -doped Gd 2 Te 4 O 11 have already been carried out and analyzed according to the crystalfield effect of the single lanthanoid site (symmetry: 1) [11,12].…”