Disorder in the Crystal Structures of Hexakis(dimethylsilyl)benzene and its Tricarbonyl Chromium, Molybdenum, and Tungsten Complexes
| Autor: | Bart Kahr, Jeffrey M. Chance, Kurt Mislow |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
chemistry.chemical_classification
Chemistry Stereochemistry chemistry.chemical_element Crystal structure Condensed Matter Physics Metal Crystallography chemistry.chemical_compound Chromium Molybdenum visual_art X-ray crystallography visual_art.visual_art_medium Benzene Inorganic compound Monoclinic crystal system |
| Zdroj: | Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals. 210:195-214 |
| ISSN: | 1058-725X |
| Popis: | The crystal structures of hexakis(dimethylsilyl)benzene (1) and its tricarbonyl tungsten (2), molybdenum (3) and chromium (4) complexes were determined by X-ray diffraction. Compound 1 crystallizes in the monoclinic system, space group P21/c with a = 11.196(5)A, b = 19.675(9)A, c = 24.447(8)A, Z = 8, at 175K. The metal complexes 2, 3, 4 are isomorphic; the compounds exhibit trigonal modifications (2t, 3t, 4t), space group R3 or R3, Z = 6. Crystal data: (2t) a = 19.044(5)A, c = 14.343(4)A, at 193 K; (3t) a = 19.056(4)A, c = 14.633(5)A, at 298 K; (4t) a = 19.047(5)A, c = 14.144(5)A, at 193 K. The metal complexes were dimorphic; compounds 2 and 3 exhibit monoclinic modifications (2m, 3m), space group P21, Z = 2. Crystal data: (2m) a = 11.059(4)A, b = 13.885(4)A, c = 11.140(3)A, β = 114.79(3)°, at 225 K; (3m) a = 11.020(6)A, b = 13.838(4)A, c = 11.099(4)A, β = 114.54(3)°, at 193 K. Each of the five structures that were solved and refined (1, 2m, 2t, 3m, 4t) exhibit an orientational disorder. The exte... |
| Databáze: | OpenAIRE |
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