项目名称: 含硫配体稀土烷基配合物的动态配位机理及其应用研究
项目编号: No.21202029
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 有机化学
项目作者: 王敦
作者单位: 海南大学
项目金额: 25万元
中文摘要: 本项目是针对目前分子合成、高分子合成领域对催化剂活性、选择性越来越高的需求,开发高性能的新型稀土烷基催化剂面临的配体设计的关键问题而提出的一项应用基础研究。本研究在制备高反1,4选择性聚丁二烯的噻吩基稀土烷基催化剂的基础上,对配合物的配位机理进行了研究,提出"动态配位"机理,并进一步研究配位机理与稀土烷基催化剂选择性及活性的关系,为配体的设计提供理论依据;在机理的指导下,不改变原有配体的配位模式,采用配位元素和基团替换法,在配体骨架不变的条件下引入不同结构 、配位元素的基团,系统研究不同的配位元素及基团对稀土烷基配合物催化活性、选择性的影响,为配体的设计提供实验依据,合成合适的配体,从而实现高效、高选择性稀土烷基催化剂的制备;此外,研究稀土烷基化合物在促进噻吩环区域选择C-H活化反应和C-Si键形成反应,以及噻吩基稀土烷基配合物在官能团转化反应中的应用。
中文关键词: 多孔材料;微孔有机聚合物;金属离子吸附;吸附动力学;吸附剂
英文摘要: The development of efficient,selective catalysts for the polymerization and other chemical transformations has been a long-standing research subject of both academic and industrial scientists. The rare-earth metal alkyl complexes are novel single-site catalyst candidates for polymerization and other chemical transformations due to the unique features of rare-earth metals. It has now become the clear that the activity and selectivity of the rare-earth metal alkyl complexes can be fine-tuned by modifying the ancillary ligands and/or changing the central metal ions. Indeed, the change in the electronic and/or steric properties of the donor atoms as well as of the ligand itself can induce a tailored reactivity at the coordinated metal center. The research is focus on the study of coordination mechanism of the rare-earth metal alkyl complexes bearing ligand containing sulfur and application to synthesize the rare-earth metal bis(alkyl)s. On the basic of the preparation of rare-earth metal alkyl complexes bearing thiophene ligands for high trans-1, 4 selective polymerization of diene, the coordination mechanism was discussed and the "dynamic coordination mechanism" hypothesis was proposed. The active species of cationic alkyl rare earth metal complex based on thiophene ligand and the application of the hypothesis wil
英文关键词: mesoporous materials;microporous organic polymer;adsorbtion of metal ion;adsorption kinetics;adsorbent