Abstract
Silver-coloured brittle single crystals of a hitherto unknown Rb 2Au 3 were synthesized by the reaction of RbN 3 and gold powder at 450 °C. The structure was determined from X-ray single-crystal diffractometry data: space group Immm; Z = 2; a = 4.942(2) A ̊ ; b = 5.442(3) A ̊ ; c = 10.601(6) A ̊ ; R/ R w ( w = 1) = 0.057/0.066; Z( F 0 2) ≥ 3 σ( F 0 2) = 152 and Z(var.) = 12. Rb 2Au 3 crystallizes in a layer structure. The gold atoms form plane 3.6.3.6. + 3 26 2(1:2)-nets. These layers are separated by rubidium atoms along [001]. The stacking sequence is characterized by A Rb B Rb A Rb B. The structural relationships between Rb 2Au 3 (Ca 2GaCu 2-type) and the K 2PtS 2- and W 2CoB 2-type are discussed.
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