Synthesis and application of bidentate nickel complexes bearing hyperbranched salicylaldimine ligands in ethylene oligomerization
作者:Cuiqin Li、Hongyang Yu、Zhiyu Lin、Fengfeng Wang、Na Zhang、Jun Wang
DOI:10.1080/00958972.2017.1293822
日期:2017.4.18
Abstract Three bidentate salicylaldimine nickel complexes containing different long-chain alkyl groups in their ligand backbone were synthesized in good yield. All the bidentate salicylaldimine ligands and their nickel complexes were fully characterized by FT-IR, 1H NMR, UV spectroscopies, and mass spectrometry. Three bidentate nickel complexes were evaluated as catalyst precursors in ethylene oligomerization
摘要 以良好的收率合成了三种配体骨架中含有不同长链烷基的双齿水杨醛亚胺镍配合物。所有双齿水杨醛亚胺配体及其镍配合物均通过 FT-IR、1H NMR、紫外光谱和质谱进行了充分表征。三种双齿镍配合物被评估为乙烯低聚反应中的催化剂前体。用甲基铝氧烷(MAO)活化后,催化活性为 5.75 × 105 g/(mol Ni·h),低聚物主要为丁烯(52.10%)和辛烯(32.63%),用于以 1-十四烷基为核心的双齿镍配合物。使用甲苯作为溶剂的配体骨架(R14-复合物)。然而,在配体骨架中以 1-十八烷基为核心的双齿镍配合物(R18-配合物)主要产生辛烯(59.38%)和 C10 + 烯烃(29. 01%),催化活性为 2.23 × 105 g/(mol Ni·h)。用乙基倍半氯化铝(EASC)在甲苯中活化后,三种镍配合物主要生成C10+产物,其中含有Friedel-Craft烷基化甲苯,催化活性均在1