Résumé Palladium nanoparticles (Pd-NPs) were supported on functional and nonfunctional Co-coordination polymers (Pd/CoBDCNH2 and Pd/CoBDC). Advanced analytical techniques revealed that Pd-NPs are supported on the external surface of the polymer framework and the functionalized framework possesses effective influence to prevent Pd-NP aggregation. Supported Pd-NPs were effectively applied as heterogeneous recyclable catalysts in the Mizoroki–Heck C–C cross coupling reactions of iodobenzene and either aromatic or aliphatic terminal alkenes. Catalytic results exhibited that highly dispersed Pd-NPs with low loading (1%) on the functional polymer (Pd/CoBDCNH2) are more effective than aggregated Pd-NPs with high loading (9%) on the nonfunctional polymer (Pd/CoBDC). Both catalysts can simultaneously provide high activity and selectivity to E-coupled products, high efficiency in low amounts, easy separation of heterogeneous catalyst and appropriate performance in the recycling reaction without addition of a reducing agent.
**摘要**
将
钯纳米颗粒(Pd-NPs)负载在功能化和非功能化的
钴配位聚合物(Pd/CoBDCNH2 和 Pd/CoBDC)上。先进分析技术揭示,Pd-NPs 支持在聚合物框架的外表面上,且功能化框架具有有效防止 Pd-NP 聚集的影响。负载的 Pd-NPs 有效地应用于
碘苯与芳香或脂肪族末端烯烃的 Mizoroki-Heck C-C 交叉耦合反应中的异相可回收催化剂。催化结果显示,在功能化聚合物(Pd/CoBDCNH2)上高度分散且负载低的 Pd-NPs(1%)比在非功能化聚合物(Pd/CoBDC)上聚集且负载高的 Pd-NPs(9%)更有效。两种催化剂均能同时提供高活性和对 E-耦合产物的高选择性,少量使用时的高效率,异相催化剂的易分离以及在无需添加还原剂的回收反应中适当表现。