Abstract
A series of salicylaldimine ligands 2-tert-butyl-6-((2,4-bis(diphenylmethyl)-8-arylnaphthalen)imine)-phenol (L1: Aryl =4-tBu-phenyl; L2: Aryl = p-tolyl; L3: Aryl = phenyl; L4: 4-CF3-phenyl) and the corresponding neutral salicylaldimine nickel complexes (Ni1-Ni4) were prepared and characterized. In ethylene polymerization at 20 °C, these nickel complexes are highly active, with activities of up to 6.88 × 105 g·mol−1·h−1. Moreover, the molecular weight of the polyethylene could reach up to 8.1 × 105. Comparing with the classic salicylaldimine nickel complexes Ni5 at 20 °C, complexes Ni1 with the 4-tBu-phenyl substituent demonstrated 8 times higher activity and 35 times higher polyethylene molecular weight.
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Acknowledgements
This work was supported by Advanced Catalysis and Green Manufacturing Collaborative Innovation Center (ACGM2016-06-01), National Natural Science Foundation of China (NSFC, 21304054), Yixing Taodu Ying Cai Program, Jiangsu Province Science and Technology Support Project (BE2014103), Foundation of Qufu Normal University (xkJ201603), National College Students Innovation Project (201610446029).
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Ji, P., Guo, L., Hu, X. et al. Ethylene polymerization by salicylaldimine Nickel(II) complexes derived from arylnaphthylamine. J Polym Res 24, 30 (2017). https://doi.org/10.1007/s10965-017-1190-y
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DOI: https://doi.org/10.1007/s10965-017-1190-y