Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (5): 1068.doi: 10.7503/cjcu20190683

• Physical Chemistry • Previous Articles     Next Articles

Effects of Anchoring Group on the Catalytic Activity of HKUST-1/TEMPO Co-catalysts

XUE Yun,YAN Mi,SHEN Yanming,MAO Huiling,WANG Chen,CHENG Hu,ZHUANG Jinliang()   

  1. Key Laboratory of Functional Materials and Chemistry of Guizhou Province, School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, China
  • Received:2019-12-17 Online:2020-05-10 Published:2020-03-27
  • Contact: Jinliang ZHUANG E-mail:jlzhuang@xmu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(21861013);the Natural Science Foundation of Guizhou Province, China([2016]1413);the Natural Science Foundation of Guizhou Province, China([2018]5769);the Ministry of Education of Guizhou Province, China(KY[2017]063)

Abstract:

By using isonicotinic acid(Iso-NTA) as a bridging molecule, a pyridyl functionalized 2,2,6,6-tetramethylpiperidinyl-1-oxy(TEMPO) radical(Iso-NTA-TEMPO) was synthesized by the condensation of 4-amino-2,2,6,6-tetramethylpiperidino-1-oxy(4-NH2-TEMPO) and isonicotinic acid. Compared with TEMPO, Iso-NTA-TEMPO exhibited higher oxidation potential, which facilitates the oxidation reaction of benzyl alcohol, without the use of Cu(Ⅱ). In the case of Iso-NTA-TEMPO/HKUST-1 hybrid catalytic system, the Iso-NTA-TEMPO can be(partially) coordinated to Cu(Ⅱ) sites of HKUST-1 by pyridyl group during catalysis. As consequence, the Iso-NTA-TEMPO/HKUST-1 catalytic system shows much higher catalytic activity than that of TEMPO/HKUST-1 system, toward the oxidation of aromatic alcohols. Moreover, HKUST-1 synthesized by template assisted solvent-induced crystallization consists a significant amount of defects, which facilitates the diffusion of Iso-NTA-TEMPO into the pores of HKUST-1, thus, improving the catalytic activity of Iso-NTA-TEMPO/HKUST-1. The Iso-NTA-TEMPO/HKUST-1 system enables the oxidation of a broad range of primary aromatic alcohols with various substituted groups and heteroatoms, as well as secondary aliphatic alcohols with high efficiency and selectivity.

Key words: HKUST-1, 2,2,6,6-Tetramethylpiperidinyl-1-oxy(TEMPO) radicals, Anchoring group, Co-catalyst, Template

CLC Number: 

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