✍ Scribed by H. Stegen; H. Jacobs
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Professor Arndt Simon zum 60. Geburtstag gewidmet Inhaltsu È bersicht. Umsetzungen von Gemengen von Kaliumamid, Wolfram und Wolframtrioxid in Autoklaven bei 650 °C fu È hren zu gelbem Kaliumoxonitridomonocyclowolframat(VI), K 10 [(WN 2,5 O 0,5 ) 4 ], das isotyp zu Ba 10 [(TiN 3 ) 4 ] ist. Kristalle der Verbindung sind nach beendeter Reaktion in einer Kaliummatrix eingebettet. Durch Extraktion des Metalls mit flu È ssigem Ammoniak werden sie isoliert. Ro È ntgenographische Untersuchungen ergaben, daû K 10 [(WN 2,5 O 0,5 ) 4 ] in der Raumgruppe P1 mit den Gitterpa-rametern
In der Struktur liegen Ringe aus vier eckenverknu È pften Tetraedern (WX 2 X 2/2 ) 4 mit X = N, O vor, die entlang der ro È ntgenographischen a-Achse gestapelt sind und eine hexagonale Stabpackung von Kolumnen bilden. Kaliumionen befinden sich vorwiegend zwischen den Kolumnen, aber auch in ihnen.
Potassium Oxo Nitrido Mono Cyclo Tungstate(VI), K 10 [(WN 2.5 O 0.5 ) 4 ] with Rings of Four Corner-Sharing Tetrahedra (WX 2 X 2/2 ) 4 with X = N, O Abstract. Reactions of mixtures of potassium amide, tungsten powder and tungsten(VI) oxide in autoclaves at 650 °C lead to yellow potassium oxo nitrido mono cyclo tungstate (VI), K 10 [(WN 2.5 O 0.5 ) 4 ], which crystallizes isotypic to Ba 10 [(TiN 3 ) 4 ]. After the reaction is finished, crystals are embedded in a matrix of potassium metal. They were isolated by washing out the metal with liquid ammonia. X-ray investigations showed that K 10 [(WN 2.5 O 0.5 ) 4 ] crystallizes in the space group P1 with lattice parameters a = 6.569( ) A Ê , b = 9.437(2) A Ê , c = 9.559(3) A Ê , a = 106.20(2)°, b = 101.93(5)°, c = 108.20(3)°and Z = 1.
The crystal structure contains rings of four corner-sharing tetrahedra (WX 2 X 2/2 ) 4 with X = N, O which are packed along the a-axis forming the motif of a hexagonal rod packing of columns. Potassium ions are located mainly between these columns but also within them.
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