Citation: Zhe Chen, Yu Liang, Da-Shuang Jia, Zhi-Min Cui, Wei-Guo Song. Simple synthesis of sub-nanometer Pd clusters: High catalytic activity of Pd/PEG-PNIPAM in Suzuki reaction[J]. Chinese Journal of Catalysis, ;2017, 38(4): 651-657. doi: 10.1016/S1872-2067(17)62797-9 shu

Simple synthesis of sub-nanometer Pd clusters: High catalytic activity of Pd/PEG-PNIPAM in Suzuki reaction

a College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China;
b School of Chemistry and Environment, Beihang University, Beijing 100191, China;
c Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Received Date: 12 January 2017
Revised Date: 26 February 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (51502089, 51302008) and the Fundamental Research Funds for the Central Universities (2016MS03).

Ultra-small metal nanoclusters have high surface energy and abundant active sites, and therefore their catalytic activities are usually significantly higher than those of larger nanoparticles. A temperature-responsive copolymer, namely poly(ethylene glycol)-co-poly(N-isopropylacrylamide) (PEG-PNIPAM) was synthesized as the first step, and then ultra-small Pd clusters stabilized within PEG-PNIPAM copolymer micelles were formed by direct reduction. Pd nanoclusters of size less than 2 nm showed outstanding catalytic activity in the Suzuki coupling reaction. The reaction between iodobenzene and phenylboronic acid was completed in as little as 10 s (turnover frequency=4.3×10⁴ h^-1). A yield of 64% was achieved in 5 min in the reaction between chlorobenzene and phenylboronic acid. The catalyst showed significant deactivation during three consecutive runs. However, this composite catalyst consisting of Pd/PEG-PNIPAM can be easily recycled based on the reversible phase transition of temperature-responsive PEG-PNIPAM. This catalyst therefore has good potential for practical applications.
- Temperature responsive,
- Hydrophilic polymer,
- Pd nanoclusters,
- Suzuki reaction
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Simple synthesis of sub-nanometer Pd clusters: High catalytic activity of Pd/PEG-PNIPAM in Suzuki reaction

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com