کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1326927 977452 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnesium complexes containing β-ketiminate and β-diketiminate ligands with dimethylamino substituents on the ligand core nitrogen atoms
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Magnesium complexes containing β-ketiminate and β-diketiminate ligands with dimethylamino substituents on the ligand core nitrogen atoms
چکیده انگلیسی

Treatment of dibutylmagnesium with two equivalents of 4-(2,2-dimethylhydrazino)dimethylhydrazone-3-penten-2-one (L1H) in diethyl ether afforded Mg(L1)2 (76%), which contains η2-L1 ligands with tetrahedral coordination at the magnesium ion. Similar treatment of dibutylmagnesium with 4-(2,2-dimethylhydrazino)-3-penten-2-one (L2H) or 5-(2,2-dimethylhydrazino)-2,6-dimethyl-4-hepten-3-one (L3H) and 4-tert-butylpyridine (4-tBupy) in diethyl ether afforded the octahedral complexes Mg(L2)2(4-tBupy)2 (85%) and Mg(L3)2(4-tBupy)2 (79%). Treatment of dibutylmagnesium with two equivalents of L2H or L3H in the absence of 4-tBupy afforded [Mg(L2)2]2 and Mg(L3)2, however, these complexes were difficult to isolate due to the sticky nature of the crude products. A better synthetic approach entailed sublimation of Mg(L2)2(4-tBupy)2 or Mg(L3)2(4-tBupy)2 at 95–100 °C/0.05 Torr, which afforded [Mg(L2)2]2 (94%) and Mg(L3)2 (80%) as colorless crystalline solids that were easily isolated. Treatment of [MgCp(CH3)(OEt2)]2 with two equivalents each of 4-tBupy and L1H afforded MgCp(L1)(4-tBupy) (65%). Similar treatment of [MgCp(CH3)(OEt2)]2 with two equivalents of L2H or L3H afforded the dimeric complexes [MgCp(L2)]2 (81%) and [MgCp(L3)]2 (84%), respectively. [MgCp(L2)]2 and [MgCp(L3)]2 decompose upon attempted sublimation at 125–130 °C/0.05 Torr to afford Cp2Mg (47–53%) and [Mg(L2)2]2 (67%) or Mg(L3)2 (74%). The X-ray crystal structures of Mg(L1)2, Mg(L3)2(4-tBupy)2, [Mg(L2)2]2, Mg(L3)2, MgCp(L1)(4-tBupy), [MgCp(L2)]2, and [MgCp(L3)]2 are described. The thermal stability and volatility of the complexes were determined through preparative sublimation experiments. Many of the complexes sublime without decomposition at moderate temperatures and low pressures, and thus represent new potential precursors for thin film growth using chemical vapor deposition and related techniques.

The synthesis, structure, and properties of Mg(L1)2, Mg(L2)2(4-tBupy)2, Mg(L3)2(4-tBupy)2, [Mg(L2)2]2, Mg(L3)2, MgCp(L1)(4-tBupy), [MgCp(L2)]2, and [MgCp(L3)]2 are described. Many of the complexes sublime without decomposition at moderate temperatures and low pressures, and thus represent new potential precursors for thin film growth using chemical vapor deposition and related techniques.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 693, Issue 23, 1 November 2008, Pages 3495–3503
نویسندگان
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