| | 1 | Author
| Karl-Friedrich Tebbe3, MervatEl Essawib, Sawsan Abd, El Khalikb | Requires cookie* | | | Title
| Untersuchungen an Polyhalogeniden, XIX [1]  | | | | Abstract
| Bis(methyltriphenylphosphonium)oktaiodid (M ePh3P)2I8, Cäsium(18-Krone-6)triiodid [Cs(C12H 24 0 6)]I3, Iodoblei(18-Krone-6)triiodid [Pb(C12H2406I]I3 und Diiodothallium(18-Krone-6)tetraiodothallat [T1(C12H240 6)I2](T1I4) Studies of Polyhalides, XIX [1] Bis(methyltriphenylphosphonium) Octaiodide (M ePh3P)2I8, Cesium(18-crown-6) Triiodide [Cs(C12H 240 6)]I3, Iodolead(18-crown-6) Triiodide [Pb(C 12H 240 6)I]I3 and Diiodothallium(18-crown-6) Tetraiodothallate [T1(C12H 240 6)I2](T1I4) (M ePh3P)2l 8 has been prepared by the reaction of methyltriphenylphosphonium iodide with iodine in ethanol. It crystallizes in the m onoclinic space group P 2 xln with a = 985.2(2), b = 1260.0(1), c -1872.6(4) pm, ß = 91.50(2)° and Z = 4. The crystal structure has been refined to R = 0.030 for 2882 reflections. It may be described as a layerlike packing of cations and anions. The anion with point symmetry 1 consists o f two triiodide groups and a bridging iodine molecule forming a rather comm on nearly planar Z-shaped octaiodide ion I82". [Cs(18-crown-6)]I3 has been prepared by the reaction of cesium_iodide and 18-crown-6 with iodine in ethanol. It crystallizes in the triclinic space group PI with a = 921.4(1), b = 1175.4(7), c = 1178.0(4) pm, a = 112.82(4), ß = 94.24(7), y = 98.60(3)° and Z = 2. The crystal structure has been refined to R = 0.038 for 3302 reflections. The geom etry of the cation [Cs(18-crown-6)]+ and of the anion I3~ is quite normal. [Pb(18-crown-6)I]I3 has been prepared by the reaction of lead iodide and 18-crown-6 with iodine in dichloromethane. It crystallizes in the m onoclinic space group P 2 j/a7 with a = 833.6(3), b = 1721.0(6), c = 1730.6(6) pm, ß = 99.61(3)° and Z = 4. The crystal structure has been refined to R = 0.047 for 2772 reflections. It consists o f com plex cations [Pb(18-crown-6)I]+ and triiodide anions I3_ forming weakly bonded ion pairs. [Tl(18-crown-6)I2](TlI4) has been prepared by the reaction of thallium (I)iodide and 18-crown-6 with iodine in dichloromethane. It crystallizes in the m onoclinic space group P 2 xln with a = 1236.8(3), b = 1382.6(3), c = 1710.2(2) pm, ß = 90.76(1)° and Z = 4. The crystal structure has been refined to R = 0.044 for 2916 reflections. It is com posed o f com plex cations [Tl(18-crown-6)I2] + nd complex anions TII4_ with their usual and expected geometry. | | | |
Reference
| Z. Naturforsch. 50b, 1429—1439 (1995); eingegangen am 4. Oktober 1994 | | | |
Published
| 1995 | | | |
Keywords
| Triiodides, Octaiodide, Tetraiodothallate, Crown Ether Complexes, Crystal Structures | | | |
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