Die Packung in drei verschiedenen Strukturtypen für Verbindungen (AsPh4)2MCl5X · 2CH2Cl2.

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Abstract
Compounds (AsPh4)2MCl5X · 2CH2Cl2 (M = metal; X = O, NO or Cl) are shown to crystallize in three different structure types with essentially equal packing density. In type I, two AsPh4+ ions are paired around an inversion center in such a way that three phenyl groups of one ion face three phenyl groups of the other ion in a staggered arrangement; the fourth phenyl group points away from the inversion center. The (AsPh4+)2 groupings are aligned to give parallel rows in which contacts between the fourth phenyl groups exist. Structure type II has layers of AsPh4+ ions; within the layer, pairs of AsPh4+ ions have a similar arrangement as in type I. In type III, half of the AsPh4+ ions form layers as in type II while the remaining AsPh4+ ions form separated (AsPh4+)2 pairs. The MCl5X2− ions and CH2Cl2 molecules fill gaps between the cation arrangements; the CH2Cl2 molecules are associated to the anions via weak hydrogen bonds. The crystal structures of (AsPh4)2TiCl6 · CH2Cl2 (type I) and (AsPh4)2UCl6 · 2 CH2Cl2 (type III) were determined and refined with X-ray diffraction data. The latter compound also crystallizes in type I. Crystal data: Type I (TiCl62−) a = 1759, b = 1563, c = 1919 pm, β = 98.58°, space group P21/c, Z = 4; type III (UCl62−) a = 1052, b = 1221, c = 2294 pm, α = 98.29, β = 104.63, γ = 101.81°, space group P[unk], Z = 2; type II (found with ReOCl52− and WOCl52−) is triclinic, space group P[unk], Z = 1.

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