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首页> 外文期刊>Chemistry: A European journal >Ordered mesoporous organosilica with ionic-liquid framework: Au efficient and reusable support for the palladium-catalyzed suzuki-miyaura coupling reaction in water
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Ordered mesoporous organosilica with ionic-liquid framework: Au efficient and reusable support for the palladium-catalyzed suzuki-miyaura coupling reaction in water

机译：具有离子-液体骨架的有序介孔有机硅：用于钯催化的水中铃木-宫浦偶联反应的金有效且可重复使用的载体

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摘要

The preparation of a novel palladium-supported periodic mesoporous organosilica based on alkylimidazolium ionic liquid (Pd@PMO-IL) in which imidazoilium ionic liquid is uniformly distributed in the silica mesoporous framework is described. Both Pd@PMO-IL and the parent PMO-IL were characterized by N_2-adsorptiondesorption, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), TEM, and solid-state NMR spectroscopy. We have demonstrated that Pd@PMO-IL is an efficient and reusable catalyst for the Suzuki-Miyaura coupling reaction of various types of iodo-, bromo-, and even deactivated aryl chlorides in water. It was also found that although the PMO-IL nanostructure acts as reservoir for soluble Pd species, it can also operate as a nanoscaffold to recapture the Pd nanoparticles into the mesochannels thus preventing extensive agglomeration of Pd. This observation might be attributed to the isolated ionic liquid units that effectively control the reaction mechanism by preventing Pd agglomeration and releasing and recapturing Pd nanoparticles during the reaction process. The catalyst can be recovered and reused for at least four reaction cycles without significant loss of activity.
机译：描述了基于烷基咪唑鎓离子液体（Pd @ PMO-IL）的新型钯负载的周期性介孔有机二氧化硅的制备，其中咪唑鎓离子液体均匀分布在二氧化硅介孔骨架中。 Pd @ PMO-IL和母体PMO-IL均通过N_2-吸附解吸，漫反射红外傅里叶变换光谱（DRIFTS），TEM和固态NMR光谱进行表征。我们已经证明，Pd @ PMO-IL是水中各种类型的碘，溴，甚至失活的芳基氯的Suzuki-Miyaura偶联反应的有效且可重复使用的催化剂。还发现，尽管PMO-IL纳米结构充当可溶性Pd物质的储库，但它也可以用作纳米支架以将Pd纳米颗粒重新捕获到介孔中，从而防止了Pd的大量附聚。该观察结果可能归因于通过在反应过程中防止Pd团聚以及释放和重新捕获Pd纳米颗粒而有效控制反应机理的分离的离子液体单元。可以回收催化剂并将其重复使用至少四个反应周期，而不会显着降低活性。

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