鈀觸媒應用於Suzuki反應時，金屬的電子密度愈大愈有利於催化反應中的氧化加成作用進行。而碳烯化合物(carbene)是一種具有強供電子能力的配位基(ligand)，因此我們在觸媒(PA2UF40)中直接加入carbene，希望藉以提升鈀金屬的電子密度，進而在催化鈴木反應上，我們觀察出其反應性已成功地產生了活化的現象。隨後，我們又合成出不同鈀金屬顆粒大小的觸媒(PA2US20、PA2UF20、PA2US58)，在交叉比對的實驗中，可以發現影響反應的因素除了金屬的電子密度之外，決定活性點多寡的表面積大小亦是需要考量的重點之一。而在觸媒的鑑定方面，我們利用到原位-紅外線光譜儀針對金屬的電子密度特性作為分析。 In Palladium-catalyzed Suzuki coupling, the higher electron density of the catalytic metal possesses the much higher active reaction will undergo. Since carbene is a well-known electron-donating ligand, herein, we describe an innovation of that versatile ligand directly loaded onto the heterogeneous Palladium catalyst which we expected to increase the electron property of the metal. Afterward, the novel catalysts turned out to exhibit a certain promotion while testing the coupling reaction of the 4-bromotoluene with phenylboronic acid. Moreover, a series of different particle size of the heterogeneous catalytic metals were also synthesized. In our crossover experiments, we find that not only the electron density of the metal dominates the reaction proceeding but the amount of the active sites affects the reactive efficiency which is determined by the surface area of the metal. Furthermore, the characterization of the catalysts was confirmed by in-situ IR analysis.
