Influence of the ligand structure on the properties of bidentate salicylaldimine nickel(II) complexes in ethylene oligomerization

Li, Yang; Guo, Lijun; Li, Feng; Huang, Jin; Li, Dan; Zhang, Na; Li, Cuiqin

doi:10.1007/s11243-021-00447-7

Cited by 3 publications

(2 citation statements)

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“…Catalyst 1 had the highest activity when the Al/ Ni ratio was 900, which was because the appropriate amount of MAO might eliminate the impurities and water in solvent and activate the nickel complex. With increasing the Al/Ni molar ratio from 300 to 900, the catalytic activity and the selectivity of C 4 olefin were increased, which was attributed to the high chain termination or the high chain transfer to alkylaluminium by large excess of MAO [19] …”

Section: Resultsmentioning

confidence: 99%

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Syntheses and Catalytic Behavior of Dendritic Macrocyclic Schiff‐Base Nickel (II) Complexes in Ethylene Oligomerization

et al. 2023

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The functionalized dendrimers play an important role in catalytic application. A dendritic Schiff base macrocyclic compound was designed and synthesized with the 1.0 generation dendrimer polyamidoamine (1.0G PAMAM) and terephthalaldehyde for ethylene oligomerization. The role of solvent in the synthesized process of dendritic macrocyclic Schiff base ligand was studied. Surprisingly, intermolecular or intramolecular cyclization occurred and formed bicyclic Schiff base ligand (Ligand 1) and polycyclic Schiff base ligand (Ligand 2). And their corresponding nickel complexes (Catalyst 1 and Catalyst 2) were also synthesized with NiCl2(DME) as material to be used for ethylene oligomerization. The effects of the reaction parameters and the chemical structure of the ligand on the catalytic behavior were investigated with methyl‐aluminoxane (MAO) as cocatalyst, and Catalyst 1 and Catalyst 2 displayed the high catalytic activity and the high selectivity for low‐carbon olefin in ethylene oligomerization. Catalyst 2 based on Ligand 2 had a higher catalytic activity of 9.12×104 g (mol Ni h)−1 in ethylene oligomerization because of large dendritic ring in the ligand for ethylene diffusion and mass transfer. Moreover, two synthesized nickel complexes based on dendritic macrocyclic Schiff base ligand had a higher catalytic activity compared with the corresponding dendritic salicylaldehydeimine nickel (II) catalyst.

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Section: Resultsmentioning

confidence: 99%

“…With increasing the Al/Ni molar ratio from 300 to 900, the catalytic activity and the selectivity of C 4 olefin were increased, which was attributed to the high chain termination or the high chain transfer to alkylaluminium by large excess of MAO. [19]…”

Section: Chemistryselectmentioning

confidence: 99%