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The crystal structures of the three title compounds were determined by X-ray diffraction. Crystal data for (AsPh 4 ) 2 OsCl 6 · 2 CH 2 C1 2 : a = 1758(1), b = 1563.2(5), c = 1920.2(7) pm, β = 98.48(4)°, Ζ = 4, space group Pljc. It is isotypic with (AsPh 4 ) 2 TiCl 6 · 2 CH 2 C1 2 ; this structure type is furtheron called a-(AsPh 4 ) 2 UCl 6 -2CH 2 Cl 2 type. For (PPh 4 ) 2 UCl 6 -2 CH 2 C1 2 a new modification was found which is isotypic with (AsPh 4 ) 2 WOCl 5 · 2 CH 2 C1 2 and that we will call 0-(AsPh 4 ) 2 UCl 6 · 2 CH 2 C1 2 type; crystal data: a = 1036.9(1), b = 1030.7(3), c = 1250.4(2) pm, α = 70.77(2)°, /? = 80.88(1)°, y = 80.39(2)°, Z= 1, space group Pi. (PPh 4 ) 2 RuCl 6 -2 CH 2 C1 2 was found to crystallize in this structure type; lattice parameters: a= 1015.6(1), ¿> = 1119.4(2), c= 1238.8(3) pm, ot = 70.65(2)°, β = 80.18(2)°, γ = 80.58(2)°. A third known structure type will be called y-(AsPh 4 ) 2 UCl 6 · 2 CH 2 C1 2 type. The packing density in the three structure types is almost the same, although the manner of packing is quite different. In all cases there are octahedral anions to which the CH 2 C1 2 molecules are attached via weak hydrogen bonds. EinleitungIn den Strukturen von Tetraphenylphosphonium-und -arsoniumsalzen findet man häufig eines von zwei Packungsprinzipien. Wenn Kationen und Anionen im Verhältnis 1:1 vorliegen, sind die Kationen in vielen Fällen zu Säulen gestapelt, in denen das einzelne Kation die Punktsymmetrie 4 exakt oder in guter Näherung erfüllt; je zwei Phenylgruppen eines Ions stehen in Kontakt zu zwei Phenylgruppen des nächsten Ions [1]. Wenn Kationen und Brought to you by |

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