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A new stacking variant of Na₂Pt(OH)₆
- Thakur, Gohil S., Reuter, Hans, Felser, Claudia, Jansen, Martin
- Zeitschrift für Naturforschung 2018 v.73 no.11 pp. 831-836
- X-ray diffraction, cations, geometry, oxygen, sodium, sodium hydroxide
- A new stacking variant of sodium hexa-hydroxo platinate(IV), Na₂Pt(OH)₆, was synthesized and its structure elucidated through X-ray diffraction. The new polymorph was prepared by direct reaction of PtO₂ with an excess of NaOH solution applying elevated oxygen pressure at 300°C. The structure consists of layers of edge sharing Pt(OH)₆ and Na(OH)₆ octahedra. These layers are separated by an edge-to-edge distance of ~2.4 Å. The packing of the hydroxide ions corresponds to the hcp sequence, the title compound thus may be regarded a cation ordered variant of the Brucite structure type. During heating above T~300°C all constitutional water is released, and anhydrous Na₂PtO₃ remains as the solid residue.