respectively. These surface species were fully characterized by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, elemental analyses, and 1H, 13C, 11B, and 19F solid-state NMR spectroscopy. These isolated cationic catalysts displayed increased ethylene polymerization activity compared to the neutral species. Most importantly, the heterogenization of the cationic complex with the phenol
Zr(CH2Ph)4 (1) 接枝到最近公开的基于无定形
二氧化硅的杂化材料上,该材料具有独特的
苯酚接枝位点[(≡SiO)2(AlOC6H4OH)(Et2O)](H)}。获得了一种单足三苄基表面物质,其结构类似于先前公开的
二氧化硅负载物质 [≡SiOZr(CH2Ph)3] (2),并完全表征为 [(≡SiO)2(AlOC6H4OZr(CH2Ph)3)(Et2O) ] (3). B(
C6F5)3 对这两种物质的活化通过苄基提取进行,产生内球离子对 [≡SiOZr(CH2Ph)2]+[(PhCH2)B( )3]– (4) 和 [( ≡SiO)2(AlOC6H4OZr(CH2Ph)2)(Et2O)]+[(PhCH2)B( )3]-(5)。这些表面物质通过漫反射红外傅里叶变换 (DRIFT) 光谱、元素分析和 1H、13C、11B 和 19F 固态核磁共振光谱进行了充分表征。与中性物质