受限几何型金属化合物的合成和催化性能
Synthesis and Catalytic Property of Constrained Geometric Structural Metal Compounds
作者单位E-mail
张公平 固体表面物理化学国家重点实验室, 厦门大学化学化工学院, 厦门 361005  
席鑫 固体表面物理化学国家重点实验室, 厦门大学化学化工学院, 厦门 361005  
蒋文军 固体表面物理化学国家重点实验室, 厦门大学化学化工学院, 厦门 361005 jiangwenj@stu.xmu.edu.cn 
陈志康 固体表面物理化学国家重点实验室, 厦门大学化学化工学院, 厦门 361005  
朱红平 固体表面物理化学国家重点实验室, 厦门大学化学化工学院, 厦门 361005 hpzhu@xmu.edu.cn 
摘要: 通过筛选合成路线和方法制备了3种桥联芴基-芳胺基化合物Me2Si[(Flu)H]NH-2,6-iPr2C6H3(L1)、Me2Si[2,7-tBu2Flu(H)]NH-2,6-iPr2C6H3(L2)和Me2Si[2,7-tBu2Flu(H)]NH-2,4,6-Me3C6H2)(L3),分别与第四族金属氯化物MCl4反应制备了4种受限几何结构的茂金属化合物[Me2Si(Flu)(N-2,6-iPr2C6H3)]ZrCl2(THF)21)、[Me2Si(2,7-tBu2Flu)(N-2,6-iPr2C6H3)]TiMe22)、[Me2Si(2,7-tBu2Flu)(N-2,4,6-Me3C6H2)]TiMe23)和[Me2Si(2,7-tBu2Flu)(N-2,6-iPr2C6H3)]HfMe24)。化合物L1~L31~4都经过谱学和元素分析表征,其中1~3还经过X射线衍射单晶结构确认。在AliBu3和(Ph3C)+[B(C6F54]-双助剂作用下研究了1~4分别催化乙烯/1-辛烯聚合性能,结果显示茂金属单活性中心作用特点以及1-辛烯的共聚效果。考察和比较了其它3种受限几何钛化合物[Me2Si(C5Me4)(NtBu)]TiCl2、[Me2Si(Ind)(NtBu)]TiCl2和[Me2Si(Flu)(NtBu)]TiMe2的催化性能;讨论了1~4的结构和催化作用的关联性。
关键词: 桥联芴基-芳胺基配体  限制性几何构型催化剂  乙烯/1-辛烯聚合  催化反应条件
基金项目: 国家自然科学基金(No.21673191,21972112)资助项目。
Abstract: Three ansa-fluorenyl-arylamino ligand compounds Me2Si[(Flu)H]NH-2,6-iPr2C6H3 (L1), Me2Si[2,7-tBu2Flu (H)]NH-2,6-iPr2C6H3 (L2) and Me2Si[2,7-tBu2Flu(H)]NH-2,4,6-Me3C6H2) (L3) were prepared by means of selection of the suitable synthetic route and method. The reactions using L1~L3 each with group Ⅳ MCl4 by nBuLi-lithiation followed with metathesis yielded the constrained geometric metallocene compounds [Me2Si(Flu)(N-2,6-iPr2C6H3)]ZrCl2 (THF)2 (1), [Me2Si(2,7-tBu2Flu)(N-2,6-iPr2C6H3)]TiMe2 (2), [Me2Si(2,7-tBu2Flu)(N-2,4,6-Me3C6H2)]TiMe2 (3) and [Me2Si (2,7-tBu2Flu)(N-2,6-iPr2C6H3)]HfMe2 (4). The operation for synthesis of all these compounds was conducted by using moisture-and oxygen-free Schlenk technology. Compounds L1~L3 and 1~4 have all been characterized by NMR spectroscopy and elemental analysis, of which 1~3 further by X-ray crystallography. In combination of AliBu3 and (Ph3C)+[B(C6F5)4]- as the co-catalysts, the catalytic properties of 1~4 were investigated on ethylene/1-octene polymerization. The results obtained indicate a single-site catalysis (SSC) with 1-octene copolymerized. The catalytic properties of related titanium compounds [Me2Si(C5Me4)(NtBu)]TiCl2, [Me2Si(Ind)(NtBu)]TiCl2 and [Me2Si(Flu)(NtBu)]TiMe2 were also examined. The correlations between the structures of 1~4 and the catalytic property are discussed.
Keywords: ansa-fluorenyl-arylamino ligand  constrained geometric catalyst  ethylene/1-octene polymerization  catalytic reaction condition
投稿时间:2020-07-28 修订日期:2020-09-28
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张公平,席鑫,蒋文军,陈志康,朱红平.受限几何型金属化合物的合成和催化性能[J].无机化学学报,2020,36(12):2249-2260.
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Support information: 相关附件:   file200361_Manuscipt-Supporting_Information.pdf