کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1299664 1498843 2006 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Group 4 metallocenes incorporating constrained-geometry carboranyl ligands
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Group 4 metallocenes incorporating constrained-geometry carboranyl ligands
چکیده انگلیسی

Ligand modifications have played a crucial role in developing new catalyst precursors for optimizing polymerization activity as well as polymer properties. o-Carborane is a highly versatile molecule and can be converted into the closo-C2B10H102−, nido-C2B9H112−, nido-C2B10H122−, and arachno-C2B10H124− ligands which are capable of being bonded to metal ions in σ-, η5-, η6-, and η7-fashion, respectively. Such unique features make the replacement possible of either a cyclopentadienyl or an amido unit in the traditional CpSiN constrained-geometry ligands, by a carboranyl moiety. These modifications lead to a novel class of constrained-geometry ligands bearing a carboanion functionality and to a new version of constrained-geometry ligand frameworks incorporating a dicarbollyl moiety. These ligands provide interesting opportunities for the design of metallocenes with new metal/charge and π/σ component combinations and for the study of the role of carborane in catalysis. Achievements, problems and perspectives in this new and rapidly growing field are discussed in this article.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Coordination Chemistry Reviews - Volume 250, Issues 1–2, January 2006, Pages 259–272
نویسندگان
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