Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (4): 468-475.DOI: 10.1016/S1872-2067(15)61050-6

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Nitrogen ligands in two-dimensional covalent organic frameworks for metal catalysis

Jianqiang Zhanga, Yongsheng Pengb, Wenguang Lengb, Yanan Gaob, Feifei Xub, Jinling Chaia   

  1. a College of Chemistry, Chemical Engineering and Material Science, Shandong Normal University, Jinan 250014, Shandong, China;
    b Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2015-12-09 Revised:2016-01-18 Online:2016-03-30 Published:2016-03-30
  • Contact: Wenguang Leng, Jinling Chai
  • Supported by:

    This work was supported by the National Natural Science Foundation of China(21473196, 21403214), the 100-Talents Program of Chinese Academy of Sciences and State Key Laboratory of Fine Chemicals, Dalian University of Technology(KF1415).

Abstract:

We introduced bipyridine ligands into a series of two-dimensional (2D) covalent organic frameworks (COFs) using 2,2'-bipyridine-5,5'-dicarbaldehyde (2,2'-BPyDCA) as a component in the mixed building blocks. The framework of the COFs was formed by the linkage of imine groups. The ligand content in the COFs was synthetically tuned by the content of 2,2'-BPyDCA, and thus the amount of metal, palladium(II) acetate, bonded to the nitrogen ligands could be manipulated. Both the bipyridine ligands and imine groups can coordinate with Pd(II) ions, but the loading position can be varied, with one ligand favoring binding in the space between adjacent COFs' layers and the other ligand favoring binding within the pores of the COFs. The Pd(II)-loaded COFs exhibited good catalytic activity for the Heck reaction.

Key words: Covalent organic framework, Metal catalysis, Heck reaction, Nitrogen ligand, Palladium