Palladium nanoparticles immobilized onto supported ionic liquid-like phases (SILLPs) for the carbonylative Suzuki coupling reaction
作者:Nianming Jiao、Zelong Li、Yan Wang、Jianhua Liu、Chungu Xia
DOI:10.1039/c5ra00443h
日期:——
Crosslinked polymeric materials based on poly(ionic liquid)s, also named supported ionic liquid-like phases (SILLPs) were prepared by copolymerization of dication imidazole ionic liquids with divinylbenzene (DVB). Using the SILLPs-related polymeric materials as supports, palladium (Pd) metal nanoparticles were immobilized and stabilized, which can efficiently catalyze the carbonylative Suzuki coupling
通过将咪唑离子液体与二乙烯基苯(DVB)共聚,可以制备基于聚离子液体的交联聚合物材料,也称为负载型离子液体样相(SILLP)。使用与SILLPs相关的聚合材料作为载体,钯(Pd)金属纳米颗粒被固定并稳定化,可以有效催化芳基碘化物与芳基硼酸的羰基Suzuki偶联反应,从而以优异的产率提供相应的产物。通过透射电子显微镜(TEM),热重分析(TG)和X射线光电子能谱(XPS),傅里叶变换红外光谱(FT-IR)对固定在SILLP上的Pd纳米颗粒进行了表征。负载在聚合物上的Pd纳米粒子的尺寸和分散性可能会受到离子液体单元含量的变化和胺基团的引入的影响。此外,热过滤和汞中毒试验表明,钯物质在反应过程中浸出到溶剂中,并在反应完成后返回到聚合物中。另外,通过过滤容易地从反应混合物中回收催化剂,并在五个连续的循环中重复使用,而其活性没有显着降低。