钯
配体(生物化学)
氧化还原
化学
联轴节(管道)
偶联反应
铃木反应
高分子化学
有机化学
材料科学
受体
催化作用
生物化学
冶金
作者
Fatemeh Pakpour,Elham Safaei,S.M. Azami,Andrzej Wojtczak,Karolina Kałduńska
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2023-01-01
卷期号:13 (5): 3278-3289
被引量:1
摘要
A novel mononuclear palladium complex with 2-(3,5-di-tert-butyl-2-hydroxyphenyl amino) benzonitrile as a non-innocent ligand (abbreviated as PdIIL2NIS) was synthesized, and characterized by IR, UV-Vis, 1H and 13C NMR spectroscopies and elemental analysis. The crystal structure clearly showed that the metal center was in a square planar environment. The bond lengths obtained from X-ray structure analysis revealed that both ligands are in the o-iminobenzosemiquinone radical form. The neutral complex showed strong absorptions in the NIR region, corresponding to the ILCT (intra-ligand charge transfer). Catalytic tests performed for the coupling reaction of terminal alkynes showed that the palladium PdIIL2NIS complex acts as a highly effective catalyst for the base-free C-C coupling reactions, leading to diyne derivatives with excellent yields. The PdIIL2NIS complex in ethanol, as a green solvent, is demonstrated to be an exceptionally active phosphine-free catalyst for the Suzuki reaction of aryl iodides and bromides. The reaction can be carried out under mild conditions (room temperature) with high yields without using a microwave or phosphine ligands. This catalyst exhibits an interesting application of redox non-innocent ligands, the electron reservoir behavior, which makes it needless to use additional reagents. The theoretical calculation provides more details about the complex structure, molecular orbitals, and electronic state.
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