Synthese und Kristallstruktur von [Rb(18-Krone-6)]2[Zn(Se4)(Se6)] / Synthesis and Crystal Structure of [Rb(18-Crown-6)]2[Zn(Se4)(Se6)]
| Autor: | Dieter Fenske, Kurt Dehnicke, Sylvia Magull |
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| Rok vydání: | 1991 |
| Předmět: | |
| Zdroj: | Zeitschrift für Naturforschung B. 46:1011-1014 |
| ISSN: | 1865-7117 0932-0776 |
| Popis: | [Rb(18-crown-6)]2[Zn(Se4)(Se6)] has been prepared by the reaction of a lithium polyselenide solution in DMF with zinc acetate in the presence of rubidium iodide and 18-crown-6. It forms dark red crystals, which were characterized by FIR spectroscopy as well as by an X-ray structure determination. Space group C2/c, Z = 4, 3012 observed unique reflections, R = 0.073. Lattice dimensions at —50 °C: a = 1963.1(14), b = 1125.9(9), c = 2060.3(16) pm, β = 90.05(3)°. The compound has a complex ionic structure, in which the zinc atom of the anion [Zn(Se4)(Se6)]2- is coordinated tetrahedrally by four selenium atoms of a Se4 2- and a Se6 2- unit in five and seven membered rings, respectively. The complex cations [Rb(18-crown-6)]+ have Rb · · · Se contacts of 360.7 and 372.0 pm with selenium atoms of the ZnSe4-ring. |
| Databáze: | OpenAIRE |
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