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(PPh 4 ) 2 [As 2 Cl 8 ] · CH 3 CN was obtained from PPh 4 Cl and S 2 Cl 2  with As or As 4 S 4  or AsCl 3  in acetonitrile. PPh 4 Cl, S 2 Cl 2  and Sb 2 S 3  yielded (PPh 4 )[Sb 2 Cl 8 ] CH 3 CN. PPh 4 Br and AsBr 3  gave (PPh 4 ) 2 [Sb 2 Br 8 ]-CH 3 CN. AsCl 2 OPh (from AsCl 3  and NaOPh) reacted with Ph 4 Br in acetonitrile in the presence of Na 2 Se, selenium, and HCl, affording (PPh 4 ) 2 [As 2 Br 4,2 Cl 3,8 ] · CH 3 CN. According to their X-ray crystal structure determinations, all products are isotypic (space group C2/c, Z=4). The centrosymmetric anions consist of two ψ octahedra sharing an edge. In the [As 2 Br 4,2 Cl 3,8 ] 2-  ion the bridging positions are taken solely by bromine atoms, whereas Br and Cl atoms occupy the other halogen positions randomly.

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Die Kristallstrukturen von Tetraphenylphosphonium- octahalogenodiarsenat( III) und -diantimonat(III) mit Acetonitril, (PPh 4 ) 2 [E 2 X 8 ] · CH 3 CN (E = As, Sb; X = CI, Br)/The Crystal Structures of Tetraphenylphosphonium Octahalogenodiarsenate (III) and Diantimonate (III) with Acetonitrile, (PPh 4 ) 2 [E 2 X 8 ]·CH 3 CN(E=As, Sb; X=Cl, Br)