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K 3 BiO 3  and Rb 3 BiO 3  have been synthesized for the first time by solid state reactions of the respective binary compounds. K 3 BiO 3  was obtained from Bi 2 O 3  and K 2 O at 550 °C, Rb 3 BiO 3  from Bi 2 O 3  and Rb 2 O at 650 °C. The compounds were structurally examined by single-crystal X -ray investigations (K 3 BiO 3 : I 4̅ 3 m, a = 1070.15(2) pm, Z = 8; Rb 3 BiO 3 : P 2 1  3, a = 875.48(2) pm, Z = 4). The structures reveal “isolated” BiO 3  3-  groups. While K 3 BiO 3  is isostructural to Na 3 BiO 3 , Rb 3 BiO 3  has the same crystal structure as Cs 3 BiO 3 .

Darstellung und Kristallstrukturanalyse von K 3 BiO 3 und Rb 3 BiO 3 / Synthesis and Crystal Structure Determination of K 3 BiO 3 and Rb 3 BiO 3