Binuclear half-metallocene chromium(iii) complexes mediated ethylene polymerization with alkylaluminium as cocatalyst
作者:Tieqi Xu、Yu Pan、Xiao-Bing Lu
DOI:10.1039/c1dt10803d
日期:——
Binuclear half-metallocene chromium complexes Cp*[3-(CHNR)-2-O-C10H5]CrCl}2 [Cp* = C5Me5; R = iPr (1), Ph (2), 2,6-iPr2C6H3 (3)] based on 1,1′-binaphthyl ligands, as well as their mononuclear analogues Cp*[3-(CHNR)-2′-R′-2-O-C20H11]CrCl [R = iPr, R′ = nBuO (4), R = Ph, R′ = nBuO (5), R = 2,6-iPr2C6H3, R′ = nBuO (6), R = iPr, R′ = H (7)], were synthesized and characterized by mass spectrometry, elemental
双核半茂金属铬络合物Cp * [3-(CH NR)-2-OC 10 H 5 ] CrCl} 2 [Cp * = C 5 Me 5;R = i Pr(1),Ph(2),2,6- i Pr 2 C 6 H 3(3)]基于1,1'-联萘配体及其单核类似物Cp * [3-(CH NR)-2'-R'-2-OC 20 H 11 ] CrCl [R = i Pr,R'= n BuO(4),R = Ph ,R'= ñ迪布奥(5)中,R = 2,6-我镨2 ç 6 ħ 3,R'= ñ迪布奥(6)中,R =我PR,R'= H(7)],合成和以质谱,元素分析,磁测量和紫外可见光谱为特征。配合物的分子结构1,3,5和通过单晶X射线晶体学分析进一步证实了6。当少量激活时AlMe 3,与它们的单核类似物相比,这些双核配合物在催化乙烯聚合中表现出更高的活性,从而提供具有单峰分子量分布的高分子量聚合物。在配合物3的亚胺氮原子上带有庞大的2