Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (10): 20220171.doi: 10.7503/cjcu20220171

• Physical Chemistry • Previous Articles     Next Articles

Synthesis of Hierarchical Porous Aromatic Frameworks for Immobilization of Thiourea Catalyst

SUN Jinshi1, CHEN Peng2(), JING Liping1, SUN Fuxing1, LIU Jia1()   

  1. 1.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China
    2.School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China
  • Received:2022-03-20 Online:2022-10-10 Published:2022-05-08
  • Contact: CHEN Peng,LIU Jia E-mail:chenpeng@nbu.edu.cn;jia@jlu.edu.cn
  • Supported by:
    the Ningbo Natural Science Foundation, China(202003N4009);the Zhejiang Provincial Natural Science Foundation of China(LY20B020004)

Abstract:

A hierarchical porous aromatic framework(PAF-70) was synthesized via a new synthetic strategy. Nitrogen adsorption-desorption isotherms showed that PAF-70 had mesoporous structure with narrowly distributed pore size. The pore width of PAF-70 was 3.8 nm, which agreed well with the simulation value(ca. 3.7 nm). Thermogravimetric analysis displayed good thermal stability of PAF-70. Furthermore, PAF-70 could not be dissolved or decomposed in almost all common solvents, which demonstrated its high chemical stability. Noteworthily, the amine group in the monomer had no negative influence on the synthetic strategy, and the amine-tagged PAF with mesopores could be obtained by the same synthetic strategy. Then using a post-synthesis modification strategy, the thiourea unit was easily introduced into the pores of PAF-70 to synthesize PAF-70-thiourea. The catalytic performance of PAF-70- thiourea was further tested using a series of alcohols in the catalysis of N-bromosuccinimide(NBS)-mediated oxidation of alcohols. In the current catalyst system PAF-70-thiourea showed high catalytic activity, high stability as well as broad substrate suitability. In comparison with the thiourea-containing MOF(IRMOF-3-thiourea) in the same catalyst system, the experimental results further demonstrated that PAFs are more suitable platforms for immobilization of catalyst for organocatalysis.

Key words: Porous aromatic framework, Thiourea, Organocatalysis, Highly stable catalyst, Oxidation of alcohols

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