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研究了维生素K_3在热解石墨电极上的电化学行为、分子定向和分子间的相互作用,用紫外吸收光谱电化学验证了它的电化学还原机理.实验结果表明维生素K_3在热解石墨电极上的反应是受吸附作用控制的2e、2H~+准可逆过程,维生素K_3分子是以C(6,7)位上的H按垂直方向吸附于热解石墨电极表面的,且吸附分子间存在着相斥的相互作用,其吸附平衡常数约为1.11×10~5,吸附能约为28.8KJ.mol~(-1).吸收光谱电化学实验结果表明维生素K_3电化学还原产物为2-甲基1,4-萘酚.
The electrochemical behavior, molecular orientation and intermolecular interaction of vitamin K_3 on pyrolytic graphite electrodes were studied, and its electrochemical reduction mechanism was verified by UV-Vis absorption spectroscopy. The experimental results showed that vitamin K_3 was adsorbed on pyrolytic graphite electrode The reaction is controlled by the adsorption of 2e, 2H ~ + quasi-reversible process, vitamin K_3 molecular C (6,7) position on the vertical direction of H adsorbed on the pyrolytic graphite electrode surface, and the existence of adsorption molecules The adsorption equilibrium constant is about 1.11 × 10 ~ 5 and the adsorption energy is about 28.8KJ · mol ~ (-1). The results of electrochemical spectroscopy showed that the electrochemical reduction product of vitamin K_3 was 2-methyl 1,4-naphthol.