Easy formation of titanocene hydride-magnesium complexes in the (C5H5−nMen)2TiCl2 (n = 3–5)-dibutylmagnesium systems
| Autor: | Ivana Císařová, Karel Mach, Pavel Šindelář, Róbert Gyepes, Jörg Hiller, J. Loub |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Ethylene
Hydride Magnesium Organic Chemistry Inorganic chemistry chemistry.chemical_element Crystal structure Triclinic crystal system Biochemistry law.invention Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Polymerization law Materials Chemistry Physical and Theoretical Chemistry Electron paramagnetic resonance Monoclinic crystal system |
| Zdroj: | Journal of Organometallic Chemistry. 497:33-41 |
| ISSN: | 0022-328X |
| DOI: | 10.1016/0022-328x(95)00102-v |
| Popis: | Complexes [(C5H5-nMen)2Ti(μ-H)2]2Mg (n = 3–5) separate from the (C5H5-nMen)2TiCl2-2TiCl2-Bu2Mg ( Bu = butyl ) systems in toluene for Mg-to-Ti molar ratios 1–4 as crystalline materials. Crystal structure of complexes (n = 5 ( 1 ): triclinic; P1 (Z = 2 ); a = 8.887(2) A , b = 12.142(4) A and c = 18.971(6) A ; α = 78.96(2)°, β = 86.29(3)° and γ = 74.82(3)°) ( n = 4 ( 2 ) : monoclinic; C2/c (Z = 4); a = 11.331(1) A , b = 13.177(2) A and c = 22.989(2) A ; β = 99.18(1)°) ( n = 3 ( 3 ) : triclinic; P1 (Z = 4); a = 12.603(3) A , b = 13.629(3) A and c = 19.561(6) A ; α = 70.77(2)° β = 79.36(1)° and γ = 83.41(1)°) revealed a linear TiMgTi arrangement with a pseudotetrahedral coordination of hydrogen atoms around the central magnesium atom. All the compounds show nearly identical electron spin resonance triplet-state spectra at g = 1.990 with D = 0.012–0.013 cm−1 and E = 0, in accordance with a nearly constant Ti(III)Ti(III) distance of 5.54–5.72 A. The complexes do not induce the polymerization of ethylene on the time scale of a month at room temperature. |
| Databáze: | OpenAIRE |
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