Ni(II) and Pd(II) complexes bearing novel chiral bis(β-ketoamino) ligand and their catalytic activity toward copolymerization of norbornene and polar norbornene derivatives
Wanyun Liu, Ping Huo, Lin Yuan, Bowen Zhao, Junying Ge
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引用次数: 0
Abstract
A series of novel Ni(II) and Pd(II) complexes bearing chiral bis(β-ketoamino) ligand were synthesized and characterized. The Ni(II) and Pd(II) complexes exhibited high activities for norbornene homopolymerization with only B(C6F5)3 as cocatalyst, for Ni(II) complex even up to 1.38 ×106 gpolymer/molNi·h. All the complexes had good thermal stability. Most importantly, the complexes also displayed high activities of 105 gpolymer/molmetal·h toward the copolymerization of norbornene and 5-norbornene-2-yl acetate with high molecular weights and tunable norbornene and 5-norbornene-2-yl acetate content. The copolymerization activity, molecular weight, and norbornene and 5-norbornene-2-yl acetate feed ratio of the Ni complex were higher than those of the Pd complex.
合成了一系列具有手性双(β-酮氨基)配体的新型Ni(II)和Pd(II)配合物并对其进行了表征。在B(C6F5)3助催化剂作用下,Ni(II)和Pd(II)配合物具有较高的降冰片烯均聚活性,Ni(II)配合物的均聚率可达1.38 ×106 gpolymer/molNi·h。所有配合物均具有良好的热稳定性。最重要的是,该配合物对降冰片烯和5-降冰片烯-2-乙酸酯的共聚具有105 g /mol·h的高活性,具有高分子量和可调的降冰片烯和5-降冰片烯-2-乙酸酯含量。Ni配合物的共聚活性、分子量、降冰片烯与5-降冰片烯-乙酸2-酯的进料比均高于Pd配合物。
期刊介绍:
The Journal of Chemical Research is a peer reviewed journal that publishes full-length review and research papers in all branches of experimental chemistry. The journal fills a niche by also publishing short papers, a format which favours particular types of work, e.g. the scope of new reagents or methodology, and the elucidation of the structure of novel compounds. Though welcome, short papers should not result in fragmentation of publication, they should describe a completed piece of work. The Journal is not intended as a vehicle for preliminary publications. The work must meet all the normal criteria for acceptance as regards scientific standards. Papers that contain extensive biological results or material relating to other areas of science may be diverted to more appropriate specialist journals. Areas of coverage include: Organic Chemistry; Inorganic Chemistry; Materials Chemistry; Crystallography; Computational Chemistry.