analysis of complexes C2 and C3 reveals distorted octahedral geometries around the chromium atoms. Upon activation with MAO, these complexes exhibit high activities for ethylene oligomerization (up to 1.28 × 107 g·mol–1(Cr)·h–1) and ethylene polymerization (up to 6.30 × 106 g·mol–1(Cr)·h–1). The oligomers were produced with high selectivity for α-olefins (>99%), and the distribution closely resembled the
一系列
铬(III)配合物,L CrCl 3(C1 - C6:L = 2-(1 H-
苯并[ d ]
咪唑-2-基)-N-(2,6-R 1 -4-R 2 -
苯基)
喹啉-8-甲
酰胺; C1:R 1 = i Pr,R 2 = H; C2:R 1 = Et,R 2 = H; C3:R 1 = Me,R 2 = H; C4:R 1 = Me,R 2 = Me; C5:R1 = H,R 2 = H;合成C6:R 1= F,R 2= H),并通过IR光谱,元素分析,质谱和磁矩表征。配合物C2和C3的X射线晶体学分析显示,
铬原子周围的八面体几何形状失真。经
MAO活化后,这些络合物对
乙烯低聚(高达1.28×10 7 g·mol –1(Cr)·h –1)和
乙烯聚合(高达6.30×10 6 g·mol –1(Cr )·h –1)。生成的低聚物对α-
烯烃的选择性高(> 99%),其分布与Schultz-Flory法则