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Albrecht, Ralf
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Publications (4/4 displayed)
- 2022Rare-Earth Hydroxometalates Ba[RE(OH)5] with RE=Tb, Dy, Hocitations
- 2022Orthoperiodato Rhodium(III) Complex as a Possible Key to Catalytic Oxidation of Organic Dyescitations
- 2020Hydroflux syntheses and crystal structures of hydrogarnets Ba3[RE(OH)6]2(RE = Sc, Y, Ho-Lu)citations
- 2019Syntheses, Crystal Structures and Physical Properties of Chromium and Rhodium Hydrogarnets Ca 3 [Cr(OH) 6 ] 2 , Sr 3 [Cr(OH) 6 ] 2 and Sr 3 [Rh(OH) 6 ] 2citations
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article
Rare-Earth Hydroxometalates Ba[RE(OH)5] with RE=Tb, Dy, Ho
Abstract
<p>Colorless crystals of the new hydroxometalates Ba[RE(OH)<sub>5</sub>] with the rare-earth elements RE=Tb, Dy, Ho were synthesized under ultra-alkaline conditions in a KOH hydroflux at 200 °C. Single-crystal X-ray diffraction revealed that the three compounds crystallize isostructural in the monoclinic space group P2<sub>1</sub>/n (no. 14). In the crystal structure, the rare-earth cations are coordinated by the oxygen atoms of seven hydroxide anions, which define a distorted pentagonal bipyramid. These polyhedra share edges of their basal ring forming infinite chains that run parallel to the [010] direction. Hydrogen bonds connect the chains into layers parallel to the (101) plane. The Ba<sup>2+</sup> cations are located between these layers and surrounded by nine oxygen atoms. Ba[Dy(OH)<sub>5</sub>] is paramagnetic and shows no luminescence under UV light. When heated in synthetic air or argon, water is released in well-defined steps. Ba[Dy(OH)<sub>5</sub>] decomposes via DyOOH to Dy<sub>2</sub>O<sub>3</sub>, which then reacts with the remaining Ba(OH)<sub>2</sub> to form BaDy<sub>2</sub>O<sub>4</sub>. Thus, the hydroxometalates can be used as carbon-free precursors for oxides.</p>