材料科学
催化作用
纳米颗粒
混合材料
共价键
多相催化
多孔性
串联
化学工程
浸出(土壤学)
X射线光电子能谱
原位
金属
聚合物
金属有机骨架
纳米技术
有机化学
化学
复合材料
冶金
环境科学
吸附
土壤科学
工程类
土壤水分
作者
Mohitosh Bhadra,Himadri Sekhar Sasmal,Arghya Basu,Siba P. Midya,Sharath Kandambeth,Pradip Pachfule,Ekambaram Balaraman,Rahul Banerjee
标识
DOI:10.1021/acsami.7b02355
摘要
The development of nanoparticle-polymer-hybrid-based heterogeneous catalysts with high reactivity and good recyclability is highly desired for their applications in the chemical and pharmaceutical industries. Herein, we have developed a novel synthetic strategy by choosing a predesigned metal-anchored building block for in situ generation of metal (Pd) nanoparticles in the stable, porous, and crystalline covalent organic framework (COF), without using conventional reducing agents. In situ generation of Pd nanoparticles in the COF skeleton is explicitly confirmed from PXRD, XPS, TEM images, and 15N NMR spectral analysis. This hybrid material is found to be an excellent reusable heterogeneous catalyst for the synthesis of biologically and pharmaceutically important 2-substituted benzofurans from 2-bromophenols and terminal alkynes via a tandem process with the turnover number up to 1101. The heterogeneity of the catalytic process is unambiguously verified by a mercury poisoning experiment and leaching test. This hybrid material shows superior catalytic performance compared to commercially available homogeneous as well as heterogeneous Pd catalysts.
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