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The title compounds have been synthesized via oxidation of the elemental pnicogenes (M = As, Bi) with the hyperoxides AO 2  (A = K, Rb, Cs) and their crystal structures were determined on the basis of single crystal X-ray data. In K 3 AsO 4  (orthorhombic, Cccm, a = 1060:1(1), b = 1135:2(1), c = 1694:0(2) pm, Z = 16) and Cs 3 AsO 4 (orthorhombic, Pnma, a = 1254:3(2), b = 902:9(2), c = 658:5(3) pm, Z = 4) isolated tetrahedra [AsO 4 ] 3-  with distances As-O between 167.0 and 170.5 pm are present, which are arranged in a nearly cubic close packing. The structure of K 3 BiO 4  (triclinic, P1̄, a = 643:18(6), b = 657:27(6), c = 762:41(7) pm, α = 101:724(2)°, β = 96:472(2)°, γ = 105:465(2)°, Z = 2) contains centrosymmetric dimers [O 3 BiO 2 BiO 3 ] 6- , in which the Bi(V) atoms are surrounded by five O atoms in a distorted trigonal bipyramidal geometry with distances Bi-O in the range of 199.5 to 233.1 pm.

zeitschrift für naturforschung b

Neue Oxopnictate A I  3 M V O 4 : Darstellung und Kristallstruktur von A 3 AsO 4  (A = K, Rb, Cs) und K 3 BiO 4  / New Oxopnictates A I  3 M V O 4 : Synthesis and Crystal Structure of A 3 AsO 4  (A = K, Rb, Cs) and K 3 BiO 4