Bis[2,2,4,4,6,6-hexamethyl-2,4,6-trisila-cyclo-hexyl]zink und sein 2,2 Bipyridyl-Addukt - spektroskopische Charakterisierung und Struktur
| Autor: | Bernd Rademacher, Matthias Westerhausen |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Coordination sphere
Stereochemistry Organic Chemistry chemistry.chemical_element Nuclear magnetic resonance spectroscopy Zinc Biochemistry Inorganic Chemistry Metal Bond length Crystallography chemistry visual_art Materials Chemistry visual_art.visual_art_medium Molecule Lithium Physical and Theoretical Chemistry Monoclinic crystal system |
| Zdroj: | Journal of Organometallic Chemistry. 443:25-33 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/0022-328x(93)80005-v |
| Popis: | The α-CHSi 2 group of bis[2,2,4,4,6,6-hexamethyl-2,4,6-trisila- cyclo -bexyllzinc, prepared by the metathesis reaction of the corresponding lithium alkanide and zinc(II) chloride, shows a remarkable low field shift of 13 ppm in the 13 C-NMR spectrum. The small 1 J ( 13 C 1 H) and 1 J ( 13 C 29 Si) coupling constants with values of 105 and 40 Hz can be attributed to the flattening of the coordination sphere of this carbon atom, bonded to the metal center. The X-ray structure reveals with ZnCSi- and SiCSi-angles of 110° and 117°, respectively, the planarisation of the α-C-atom. The molecules of this compound, which crystallize from n-pentane in the monoclinic space group P2 1/n with a = 663,9(1), b = 1350,8(2), c = 1624,5(2) pm, β = 98,22(1)° and Z = 2, show a crystallographically enforced linear CZnC-moiety with ZnC bond lengths of nearly 194 pm. The complexation of 2,2′-bipyridine to this compound leads to a strong high field shift of the α-carbon atom of approximately 8 ppm. |
| Databáze: | OpenAIRE |
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