کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10269252 | 459825 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In situ FT-IR spectroelectrochemical study of electrooxidation of pyridoxol on a gold electrode
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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![عکس صفحه اول مقاله: 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](/preview/png/10269252.png)
چکیده انگلیسی
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 0.1Â M 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 â0.5Â V versus AgÇAgClÇKCl(sat), which was much lower than the potential of PN electrooxidation observed from ca. 0Â V.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 51, Issue 6, 25 November 2005, Pages 1059-1068
Journal: Electrochimica Acta - Volume 51, Issue 6, 25 November 2005, Pages 1059-1068
نویسندگان
Mei Ling Wang, You Yu Zhang, Qing Ji Xie, Shou Zhuo Yao,