Synthesis, characterization, and ethylene oligomerization of three novel dendritic nickel catalysts
作者:Jun Wang、Li-Li Ma、Lei Song、Si-Han Wang、Hong-Liang Huo、Cui-Qin Li
DOI:10.1007/s11696-016-0009-3
日期:2017.5
dendritic nickel complexes C1–C3 were synthesized from three poly(amido amine) dendrimers, salicylic aldehyde and nickel chloride hexahydrate via Schiff base condensation reaction and coordination reaction. The structures of the dendritic ligands and nickel complexes were characterized by FT-IR, UV, 1H NMR, ESI–MS, and elemental analysis. When activated with aluminum co-catalysts, three complexes C1–C3
通过席夫碱缩合反应和配位反应,由三种聚(酰胺基胺)树枝状聚合物,水杨醛和六水合氯化镍合成了三种树枝状镍配合物C1 - C3。通过FT-IR,UV,1 H NMR,ESI-MS和元素分析对树枝状配体和镍配合物的结构进行了表征。当用铝助催化剂活化时,三种配合物C1 - C3能够催化乙烯低聚。配合物C1 – C3的催化活性和产物分布取决于反应参数,助催化剂,溶剂和预催化剂的结构。当使用倍半氯化乙基铝(EASC)作为甲苯中的助催化剂时,具有最长桥连亚甲基的配合物C3的催化活性最高,为1.63×10 6 g·(mol Ni·h)-1,C含量为69.15%11,在30分钟,25℃,900为0.5MPa和Al / Ni比的乘积。