| Autor: |
Janickis, Vitalijus, Törnroos, Karl Wilhelm, Herberhold, Max, Songstad, Jon, Milius, Wolfgang |
| Zdroj: |
Zeitschrift für anorganische und allgemeine Chemie; September 2002, Vol. 628 p1967-1974, 8p |
| Abstrakt: |
Red crystals of [(CH3)4N]2[Se16Br18] (1) were isolated when selenium and bromine were allowed to react in acetonitrile solution in the presence of tetramethylammonium bromide. The salt 1crystallizes in the monoclinic space group P 21/n with the cell dimensions a = 12.1876(4) Å, b = 18.9670(4) Å, c = 12.2390(4) Å, ß = 91.908(2) ° (123 K). In the solid state structure the [Se16Br18]2—anion consists of two [Br(Se2Br2)4]—subunits which are related by an inversion centre and connected by 4 weak Se—Br bonds (3.2588(9) Å and 3.3887(9) Å, respectively). Each monoanionic subunit may be regarded as built up of 4 Se2Br2molecules, coordinated to a central bromide ion at distances of 3.0731(9)—3.1061(9) Å. The structure of the [Se16Br18]2—dianion can also be formally derived from the known [Se4Br6]2—dianion which uses each of its two bridging bromo ligands for coordination of 3 additional Se2Br2molecules. |
| Databáze: |
Supplemental Index |
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