文献类型：期刊文献

英文题名：Iron- and cobalt-based ethylene dimerization catalysts supported by fused iminoimidazonaphthyridine ligands

作者：Li, Hongxiu;Sun, Aoao;Hu, Chaojie;Zhao, Mei-Xin[1];Zhang, Jun[1]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, 130 Mei Long Rd, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, 130 Mei Long Rd, Shanghai 200237, Peoples R China

年份：2026

卷号：1058

外文期刊名：JOURNAL OF ORGANOMETALLIC CHEMISTRY

收录：;EI(收录号：20262621018501);WOS:【SCI-EXPANDED(收录号:WOS:001812332500001)】；

基金：Financial support from the Fundamental Research Funds for the Central Universities (222201717003) , and the National Natural Science Foundation of China (22071055) is greatly acknowledged.

语种：英文

外文关键词：ligands; Iron catalysts; Cobalt catalysts; Ethylene dimerization; 9-Imino-Imidazo[1,2-h][17]naphthyridine

摘要：A series of 9-imino-imidazo[1,2-h][1,7]naphthyridine ligands as well as their iron and cobalt complexes were synthesized and structurally characterized by single-crystal X-ray crystallography. X-ray diffraction analysis of these complexes revealed that complex Fe1 and Co1 have four-coordinate distorted tetrahedron geometry. However, complex Co2 displayed another way to form distorted tetrahedron geometry, in which the cobalt was coordinated with two nitrogen atoms from two ligands and two chlorides in the crystalline state. Upon activation with methylaluminoxane (MAO), excellent selectivity for butenes (> 99%) and 1-butene (> 99%) with catalytic activity of 2.13 & times; 10(5) g & centerdot;mol(-1)(Fe)& centerdot;h(-1) or 2.11 & times; 10(5) g & centerdot;mol(-1)(Co)& centerdot;h(-1) could be achieved by using Fe1 or Co1 as catalyst, respectively. The effects of ligand environment and reaction conditions on the catalyst performance in ethylene oligomerization have been explored. The lower reactivity is partly attributed to the presence of a rather longer M-N3 bond, which leaves the metal sites less protected from the N,N,N-tridentate ligands.