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- Title
Sc2[Se2O5]3: The First Rare-Earth Metal Oxoselenate(IV) with Exclusively [Se2O5]2− Anions.
- Authors
Greiner, Stefan; Schleid, Thomas
- Abstract
The scandium oxodiselenate(IV) Sc2[Se2O5]3 was synthesized via solid-state reactions between scandium sesquioxide (Sc2O3) and selenium dioxide (SeO2) with thallium(I) chloride (TlCl) as fluxing agent in molar ratios of 1:4:2. Evacuated fused silica ampoules were used as reactions vessels for annealing the mixtures for five days at 800 °C. The new scandium compound crystallizes in the triclinic space group <italic>P</italic> 1 ¯ with the lattice parameters <italic>a</italic> = 663.71(5) pm, <italic>b</italic> = 1024.32(7) pm, <italic>c</italic> = 1057.49(8) pm, <italic>α</italic> = 81.034(2)°, <italic>β</italic> = 87.468(2)°, <italic>γ</italic> = 89.237(2)° and Z = 2. There are two distinct Sc3+ positions, which show six-fold coordination by oxygen atoms as [ScO6]9− octahedra (<italic>d</italic>(Sc–O) = 205–212 pm). Three different [Se2O5]2− anions provide these oxygen atoms with their terminal ligands (Ot). Each of the six selenium(IV) central atoms exhibit a stereochemically active lone pair of electrons, so that all [Se2O5]2− anions consist of two ψ1-tetrahedral [SeO3]2− subunits (<italic>d</italic>(Se–Ot) = 164–167 pm, <italic>d</italic>(Se–Ob) = 176–185 pm, ∢(O–Se–O) = 93–104°) sharing one bridging oxygen atom (Ob) with ∢(Se–Ob–Se) = 121–128°. The vibrational modes of the complex anionic [Se2O5]2− entities were characterized via single-crystal Raman spectroscopy.
- Subjects
SCANDIUM compounds; RARE earth metal compound synthesis; CRYSTALLOGRAPHY
- Publication
Crystals (2073-4352), 2018, Vol 8, Issue 5, p187
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst8050187