摘要
含氮膦配体的钯配合物分别被负载于纳米二氧化硅和MCM-41表面。由此得到的两种新型多相钯催化剂SiO_2@PNPPdCl_2(1)和MCM-41@PNPPdCl_2(2)均通过SEM(EDX)、TEM(SAED)、XRD、FT-IR、ICP-MS和TGA等手段进行全面表征。微观结构表明,这两种纳米颗粒具有完全不同的结构,1为不规则球体,2具有蜂窝孔状结构。然后进一步研究了纳米粒子1和2在Suzuki偶联反应中以乙醇和水为溶剂的温和条件下的催化性能。研究显示两种催化剂均具有较好的基团耐受性,循环利用4次的平均产率分别为81%(1)和89%(2)。它们的催化性能也略有不同,催化剂1的催化速率高于2,催化剂2具有较好的循环利用性能。
Palladium compounds containing diphosphine ligand with N atom were immobilized on the surface of nano silica and MCM-41 respectively. The resulting two novel heterogeneous Pd catalysts SiO2@ PNPPdCl2( 1) and MCM-41@ PNPPdCl2( 2) were fully characterized by SEM( EDX),TEM( SAED),XRD,FT-IR,ICP-Ms and TGA. Microstructure tests showed that the two kinds of nanoparticles have completely different structures,1 has an irregular sphere structure and 2 has a honeycomb structure. The catalytic performance of nanoparticles 1 and 2 under mild conditions with EtO H/H2O( v/v = 3/2) as solvent in Suzuki coupling reaction was further studied. The two catalysts had good group tolerance,and their average yields in four cycles were 81%( 1) and 89%( 2) respectively.Their catalytic properties are also slightly different. The catalytic rate of catalyst 1 is much faster than that of 2,while catalyst 2 has better recycling performance.
作者
曹锰
王振希
张健
徐胜
张尚玺
柳阳
戴欣
江新德
吴锦辉
Cao Meng;Wang Zhenxi;Zhang Jian;Xu Sheng;Zhang Shangxi;Liu Yang;Dai Xin;Jiang Xinde;Wu Jinhui(College of Sciences, Nanchang Institute of Technology , Nanchang 330099)
出处
《化学通报》
CAS
CSCD
北大核心
2019年第4期340-349,共10页
Chemistry
基金
江西省教育厅自然科学基金项目(GJJ161127)资助
