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1979 (1)
1Author    Joachim Strähle, Jürgen Gelinek, Marianne Kölmel, Anna-Maria NemecekRequires cookie*
 Title    Die Kristallstruktur der Salze K2Au2I6 und Cs2Ag_rAu I 1_aAu 1,I Br6. Ein Beitrag zur Kristallchemie der Alkalihexahalogenoaurate(I,III) Crystal Structure of the Salts K2AU2IÖ and Cs2Aga;Au I I_a;Au III Br6. A Contribution to the Crystal Chemistry of the Alkali Hexahalogeno Aurates(I,III)  
 Abstract    K2Au2l6 crystallizes in the monoclinic space group P 2i/n. It is built up by linear anions AUI2 _ , square-planar anions AUU -, and K+ cations. The coordination of the gold(I) and gold(III) atoms is completed by additional iodine atoms at larger distances to form compressed and elongated octahedra, respectively. Like the other known alkali hexa-halogeno aurates(I,III), K2AU2IÖ belongs to a family of topologically related structures in which the perovskite is the aristotype. The actual structures depend on the size of the alkali metals: more dense structures with smaller coordination numbers for the smaller alkali metals result from a rotation of the coordination octahedra of the gold atoms. Cs2AgAuBr6 does not crystallize in the ideal cubic perovskite structure, as was de-scribed in 1942, but a disordered cubic phase (a = 550.1 pm, space group Pm3m), with the composition Cs2Aga.Auii_aAuniBr6 (x ^0.25), can be prepared from HBr solution. Its cubic symmetry is the result of a statistical superposition of the coordination polyhedra of Agi, Aui and Auni. 
  Reference    Z. Naturforsch. 34b, 1047—1052 (1979); eingegangen am 3. Mai 1979 
  Published    1979 
  Keywords    Crystal Structure, Alkali Metal Hexahalogeno Aurates(I, III), Crystal Chemistry 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1047.pdf 
 Identifier    ZNB-1979-34b-1047 
 Volume    34