Nickel(II) complexes with tripodal NNN ligands as homogenous and supported catalysts for ethylene oligomerization
作者:Vladislav A. Tuskaev、Sergei V. Zubkevich、Daniele Saracheno、Svetlana Ch. Gagieva、Pavel V. Dorovatovskii、Elena G. Kononova、Victor N. Khrustalev、Dmitry N. Zarubin、Boris M. Bulychev、Yury V. Kissin
DOI:10.1016/j.mcat.2018.12.018
日期:2019.2
correspondingly and represent a monomeric octahedral nickel complexes, that are typical for tridentate scorpion-type ligands. New method for immobilization of nickel complexes with derivatives of N,N-bis(pyrazol-1-ylmethyl)propylamine on silica gel modified with aminopropyl groups was proposed. The EXAFS/XANES analysis indicated that Ni atom in the supported complexes adopt almost octahedral geometry, being partly
合成了四种新的镍(II)与N,N-双(吡唑-1-基甲基)丙胺衍生物的配位化合物;通过红外光谱和元素分析证实了它们的组成和结构。在X射线衍射研究中明确确定了产物13和15的结构。化合物13和15分别在正交晶体空间群Pna2 1和P2 1 2 1 1 2 1中结晶,并代表单体八面体镍配合物,这是三齿蝎型配体的典型特征。用N,N-衍生物固定镍配合物的新方法提出了用氨基丙基改性的硅胶上的双(吡唑-1-基甲基)丙胺。的EXAFS / XANES分析表明,负载的络合物的Ni原子采取几乎八面体几何形状,被部分被氮原子从有机配体包围,并且通过硅烷醇基团部分接枝到二氧化硅的表面上,溴-外配位球。当用Et 2 AlCl或Et 3 Al 2 Cl 3活化时,原始配合物和负载的配合物都催化乙烯低聚,主要形成丁烯异构体。通常,固定化的配合物表现出较高的活性和对1-丁烯形成的更好的选择性。