Catalytic mechanism of Cu（p-OTs）2／ethanolamine as mimetic enzyme
摘要
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 CH3 OH 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 CH3 OH. 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.