In situ FT-IR spectroelectrochemical study of electrooxidation of pyridoxol on a gold electrode
In situ FT-IR spectroelectrochemical study of electrooxidation of pyridoxol on a gold electrode
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金电极上吡哆醇电氧化的原位 FT-IR 光谱电化学研究
DOI：
10.1016/j.electacta.2005.05.046
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发表时间：
2005-11
期刊：
影响因子：
--
通讯作者：
姚守拙
中科院分区：
文献类型：
--
作者：
王美玲;张友玉*;谢青季;姚守拙
The electrochemical oxidation of pyridoxol (PN) on a polycrystalline gold electrode was investigated by cyclic voltammetry and in situ Fourier transform infrared spectroscopy (FTIRS). In 0.1M aqueous NaOH solution, the gold electrode showed a high catalytic activity for the irreversible oxidation process of PN. The individual ionic species and the major tautomeric equilibria of PN molecules in aqueous solutions were evidenced well from the pH-dependent attenuated total reflectance (ATR) spectra, and the results were in good agreement with the voltammetric observations. In situ single potential alteration infrared reflectance spectroscopy (SPAIRS) demonstrated that a lactone form of PN, rather than pyridoxal aldehyde, was likely formed, which was subsequently diffused into the thin layer solution and underwent hydrolysis slowly to pyridoxic acid (PA) as the final product. In addition, the adsorption of PN at Au electrode was characterized by in situ subtractively normalized interfacial Fourier transform infrared reflectance spectroscopy (SNIFTIRS) method, which revealed that the adsorption of deprotonated PN, via nitrogen atom in vertical configuration on electrode surface, occurred from −0.5V versus AgǀAgClǀKCl(sat), which was much lower than the potential of PN electrooxidation observed from ca. 0V.
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影响因子：
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