权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Rare-earth metal-based Ziegler catalysts: structure-reactivity relationships in anionic coordination polymerization

稀土金属基齐格勒催化剂：阴离子配位聚合中的结构-反应性关系

基本信息

批准号：
161793936
负责人：
Professor Dr. Reiner Anwander
金额：
--
依托单位：
Institut für Anorganische Chemie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/161793936?language=en
关键词：
Rare earth metal based Ziegler

项目摘要

Ziegler-Mischkatalysatoren represent one of the most important and impactful discoveries in metalorganic catalysis displaying unique application potential for the fabrication of synthetic polymers. The long-term scientific goal of the project is to gain a profound knowledge of such empirically designed multicomponent Ziegler catalysts by considering the rare-earth metal-based stereospecific coordination polymerization, in particular 1,3-diene polymerization, as an example. The focus of the predominantly experimental work lies on the utilization of tailor-made rare-earth metal components (keywords: alkylaluminates, amides, carboxylates, half-sandwich complexes) for examining the alkyl, hydrido, and chloro transfer capability of tailor-made organoaluminum (cocatalyst) components. The systematic study will not only provide fundamental insights into the reaction pathways and activation sequences involved but also assist in developing more efficient polymerization catalysts and ultimately in paving the way for the synthesis of single-component catalysts. Crucially, rare-earth metal centers display highly active polymerization initiators and at the same time facilitate the isolation and spectroscopic/structural characterization of Ln-Al heterobimetallic complexes which can be seen as activation intermediates. Subprojects will deal with the reduction capability of organoaluminum hydrides toward rare-earth metal carboxylates or the elucidation of factors such as cocatalyst metal, cocatalyst ligand, and weakly coordinating anions (including the investigation of pseudo halides). The obtained data will allow conclusions to structure-reactivity relationships in related polymerization catalysts involving early d-transition metals, in particluar group 4 metals.

Ziegler-Mischkatalysatoren是金属有机催化领域最重要和最具影响力的发现之一，在合成聚合物的制造中显示出独特的应用潜力。该项目的长期科学目标是以稀土金属为基础的立体定向配位聚合，特别是1，3-二烯聚合为例，获得对这种经验设计的多组分齐格勒催化剂的深刻认识。主要实验工作的重点在于利用定制的稀土金属组分（关键词：烷基铝酸盐，酰胺，羧酸盐，半夹心复合物），用于检查定制的有机铝（助催化剂）组分的烷基，亚烷基和氯转移能力。系统的研究不仅将提供基本的见解的反应途径和活化序列，但也有助于开发更有效的聚合催化剂，并最终在铺平道路的单组分催化剂的合成。最重要的是，稀土金属中心显示高活性的聚合引发剂，并在同一时间促进的分离和光谱/结构表征的Ln-Al杂环配合物，可以被看作是活化中间体。子项目将处理有机铝化合物对稀土金属羧酸盐的还原能力，或对助催化剂金属、助催化剂配体和弱配位阴离子等因素的阐明（包括对拟卤化物的研究）。所获得的数据将允许的结论，在有关的聚合催化剂涉及的前d-过渡金属，特别是第4族金属的结构-反应性关系。