ChemistryNa5Rb[(WN3)2] and Na5Cs[(WN3)2], two new sodium nitrido tungstates(VI) with the heavier alkali metals rubidium and cesium

Add time:08/29/2019    Source:sciencedirect.com

Alkali metal amides react above 600°C with tungsten powder in autoclaves to form nitrido tungstates(VI). Autoclaves are used for this type of reaction in order to avoid rapid decomposition of amides at relatively low temperatures to metal, nitrogen and hydrogen.Starting with an excess of the corresponding mixtures of amides the compounds Na5Rb[(WN3)2] and Na5Cs[(WN3)2] were obtained. After the reaction is carried out the nitrido metallates(VI) are embedded in the alkali metal. Orange-brown (Rb) and orange (Cs) crystals were isolated by extracting the metals with liquid ammonia at room temperature.The structures of the two compounds were determined by X-ray single crystal methods.Space group P21/c (No. 14), Z = 8.Na5Rb[(WN3)2]: a = 9.355(2) Å, b = 10.277(3) Å, c = 19.165(3) Å, β = 90.12(2)°.Na5Cs[(WN3)2]: a = 9.403(3) Å, b = 10.236(2) Å, c = 19.501(4) Å, β = 90.01(2)°.The isotypic compounds contain infinite chains of corner sharing tetrahedra ∞1[WN2N2/23−]. These chains are linked together three dimensionally by sodium and the heavier alkali metal within each compound in a somewhat differing way.

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