Synthese,Kristallstruktur und Eigenschaften von Na2RbAuO2

Synthesis, Crystal Structure, and Properties of Na₂RbAuO₂ Single phase samples of Na₂RbAuO₂ were prepared by reacting RbAu with Na₂O₂ in an equimolar ratio in sealed silver cylinders (placed under argon in glas tubes) at 400 °C for two weeks. The colourless single crystals of needle shaped habitus decompose immediately when exposed to air. Na₂RbAuO₂ (Pearsoncode oP12, Pnnm, a = 992.76(6), b = 559.03(3), c = 408.64(3) pm, Z = 2, 414 reflections with I_o > 2σ(I), R₁ = 0.0363, wR₂ = 0.1057) crystallizes isotypic with Na₂KAuO₂. Besides linear [O–Au–O] units, which are characteristic for oxoaurates(I), the structure reveals uncommon low coordination numbers for the alkali metal cations.