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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 6    December 2004

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Catalytic mechanism of Cu(p-OTs)2/ethanolamine as mimetic enzyme
SONG Ji-guo(宋继国), SHEN Pei-kang(沈培康)

State Key Laboratory of Optoelectronic Materials and Technologies,
School of Physics and Engineering, Zhongshan University, Guangzhou 510275, China

Abstract: The electrochemical behaviors of various copper salts complexes coordinated with equal molar ethanolamine were studied, and those of Cu(p-OTs)2 and Cu(p-OTs)2/ethanolamine(1∶1) complex in CH3OH or DMF were characterized. The results show that the reduction of Cu(Ⅱ) in Cu(p-OTs)2 is via one two-electron step mechanism both in CH3OH and DMF. The reduction mechanism transforms to two one-electron steps in the case of Cu(p-OTs)2/ethanolamine(1∶1) in DMF. However, it does not change in CH3OH. All the Cu(Ⅱ)/ethanolamine(1∶1) with the electrochemical reactions are through two one-electron steps, and can act as mimetic enzyme to oxidize 1,1′-bi-2-naphthol. The Cu(Ⅱ)/ethanolamine(1∶1) with electrochemical reactions through one two-electron step could not act as mimetic enzyme. It is concluded that the transformation between centre Cu(Ⅱ) and Cu(Ⅰ) is the crucial condition for the catalytic activity of copper-amine complex.

 

Key words:  copper p-toluenesulfonate; mimetic enzyme; 1,1′-bi-2-naphthol; electrochemistry

ISSN 1672-7029
CN 43-1423/U

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