Die Kristallstrukturen von Tetraphenylphosphonium- octahalogenodiarsenat( III) und -diantimonat(III) mit Acetonitril, (PPh4)2[E2X8] · CH3CN (E = As, Sb; X = CI, Br)/The Crystal Structures of Tetraphenylphosphonium Octahalogenodiarsenate (III) and Diantimonate (III) with Acetonitrile, (PPh4)2[E2X8]·CH3CN(E=As, Sb; X=Cl, Br)
1999 ◽
Vol 54
(2)
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pp. 288-290
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Keyword(s):
X Ray
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(PPh4)2[As2Cl8] · CH3CN was obtained from PPh4Cl and S2Cl2 with As or As4S4 or AsCl3 in acetonitrile. PPh4Cl, S2Cl2 and Sb2S3 yielded (PPh4)[Sb2Cl8] CH3CN. PPh4Br and AsBr3 gave (PPh4)2[Sb2Br8]-CH3CN. AsCl2OPh (from AsCl3 and NaOPh) reacted with Ph4Br in acetonitrile in the presence of Na2Se, selenium, and HCl, affording (PPh4)2[As2Br4,2Cl3,8] · CH3CN. 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 [As2Br4,2Cl3,8]2- ion the bridging positions are taken solely by bromine atoms, whereas Br and Cl atoms occupy the other halogen positions randomly.