کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1341019 979767 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and structures of ferrocenyl-substituted salicylaldiminato complexes of magnesium, titanium and zirconium
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis and structures of ferrocenyl-substituted salicylaldiminato complexes of magnesium, titanium and zirconium
چکیده انگلیسی

N-ferrocenyl salicylaldimine (FcPI)H, readily accessible from aminoferrocene and salicylaldehyde, reacts with dibutylmagnesium in THF to afford a red crystalline (FcPI)2Mg(THF)2 (2). The reactions of the Li(FcPI) with CpTiCl3 gave CpTiCl2(FcPI) · CH2Cl2 (4), whereas with CpZrCl3 · DME a mixture of three products is formed: CpZrCl(FcPI)2 (5), CpZrCl2(FcPI) (6), and (FcPI)2ZrCl2 · CH2Cl2 (3 · CH2Cl2). The crystal structures of compounds 2–6 are reported. Typically, the N–O chelates are oriented such that O donors are mutually trans, while N donors prefer to be trans to Cl ligands. The redox potentials of these complexes are very similar to ferrocene. On activation with methylaluminoxane, the Ti complex 4 shows moderate activity for ethylene polymerisation, while (FcPI)2ZrCl2 is highly active for the oligomerisation of ethylene, to give products with average degrees of polymerisation of 12–16.

The preparation and structures of the N-ferrocenyl salicylaldiminato complexes (FcPI)2Mg(THF)2, CpTiCl2(FcPI) · CH2Cl2, CpZrCl(FcPI)2, CpZrCl2(FcPI), and (FcPI)2ZrCl2 · CH2Cl2 is described. They are electrochemically active, with redox potentials close to ferrocene. On activation with methylaluminoxane, the Ti complex polymerises ethylene, while (FcPI)2ZrCl2 is a highly active ethylene oligomerisation catalyst.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 25, Issue 2, 23 January 2006, Pages 387–396
نویسندگان
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