Development of Nitrile-Functionalized Ionic Liquids for C−C Coupling Reactions: Implication of Carbene and Nanoparticle Catalysts
摘要:
A series of nitrile-functionalized imidazolium salts (many of which are liquid at room temperature) have been prepared. The reactivity of these salts with PdCl2 has been studied, resulting in salts containing a tetrachloropalladate dianion or compounds in which the nitrile substituent coordinates to the palladium center. Further derivation of the latter compounds affords carbenes. All the new compounds have been characterized by spectroscopic methods and nine of them by single-crystal X-ray diffraction. The catalytic activity of the different palladium salts in Suzuki, Stille, and Heck reactions has been evaluated in some of the nitrile-functionalized ionic liquids (ILs) and compared with that of nonfunctionalized ILs, providing insights into the nature of the actual catalyst. In some instances, palladium nanoparticles have been identified, but the nature of the catalyst strongly depends on the IL employed.
The Buoy Effect: Surface Enrichment of a Pt Complex in IL Solution by Ligand Design
作者:Daniel Hemmeter、Daniel Kremitzl、Peter S. Schulz、Peter Wasserscheid、Florian Maier、Hans‐Peter Steinrück
DOI:10.1002/chem.202203325
日期:2023.1.12
Liganddesign has a strong impact on the surface activity of organometallic complexes. Complementing the ligand system of a Ptcomplex with fluorinated groups triggers strong enrichment at the IL/vacuum interface in ILsolution in a buoy-like fashion, which was studied by ARXPS.
配体设计对有机金属配合物的表面活性有很大影响。用氟化基团补充 Pt 络合物的配体系统会以浮标状方式在 IL 溶液中的 IL/真空界面触发强烈富集,ARXPS 对此进行了研究。