和频振动光谱研究多晶金电极/溶液界面乙腈分子取向的flip-flop行为

doi:10.61558/2993-074X.2082

电化学（中英文） ›› 2011, Vol. 17 ›› Issue (2): 134-138. doi: 10.61558/2993-074X.2082

和频振动光谱研究多晶金电极/溶液界面乙腈分子取向的flip-flop行为

黄芝1，唐鑫1，邓罡华1，周恩财2，王鸿飞3，郭源1*

1.中国科学院化学研究所分子反应动力学国家重点实验室，北京 100190；
2. 天津艾达恒晟科技发展有限公司，天津 300200；
3. Division of Scientific Resource Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory

收稿日期:2010-12-10 修回日期:2011-01-28 出版日期:2011-05-28 发布日期:2011-05-06
通讯作者: 郭源 E-mail:guoyuan@iccas.ac.cn
基金资助:
国家自然科学基金（20773143），973项目（2007CB815205）

The Flip-Flop Behavior of Acetonitrile at Au Electrode Surface Investigated by Sum Frequency Generation Vibrational Spectroscopy

HUANG Zhi1, TANG Xin1, DENG Gang-hua1, ZHOU En-cai2, WANG Hong-fei3, GUO Yuan1*

1. State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190,China;
2.Tianjin AidaHengsheng Technology co.Ltd, Tianjin 300200;
3. Division of Scientific Resource Environmental Molecular Science Laboratory Pacific Northwest National Laboratory

Received:2010-12-10 Revised:2011-01-28 Published:2011-05-28 Online:2011-05-06
Contact: GUO Yuan E-mail:guoyuan@iccas.ac.cn

摘要/Abstract

摘要： 用和频振动光谱研究乙腈/金电极界面，观测到乙腈的甲基振动峰强度随施加的电极电势而变化.当电极电势越过零电荷电势（pzc）时，甲基振动峰符号发生反转，这意味着基团取向发生反转（flip-flop）.由此推断出乙腈分子在金电极界面的吸附构型.即在零电荷电势下，电极界面吸附的乙腈分子构型为甲基靠近电极表面而腈基远离电极表面；而高于零电荷电势则电极界面吸附的乙腈分子构型发生反转，变为腈基靠近电极表面而甲基远离电极表面的构型.

关键词: 和频振动光谱, 取向反转, 金电极, 乙腈

Abstract: The electrochemical interface between liquid acetonitrile and polycrystal gold electrode is investigated by in situ infrared visible sum frequency generation spectroscopy (SFG-VS). The structure of acetonitrile adsorbed at polycrystal gold electrode surface is studied as a function of electrode potential. The SFG spectra of CH3 group indicate acetonitrile orients in response to the electrode potential. The SFG signal of CH3 group turns lower as the electrode potential changes from -700mV to 300mV, and vanishes around the 300mV(pzc), then becomes a negative signal above 500mV, which indicates that the orientation is predominately with the CH3 group toward the metal between -700 and 300mV and with the CN group toward the metal above 300 mV. It is the first time to observe the flip-flop behavior of acetonitrile dipole at the polycrystal gold electrode surface, from which we may infer that the flip-flop behavior of acetonitrile is a common phenomenon.

Key words: sum frequency generation vibrational spectroscopy, flip-flop, gold electrode, acetonitrile

中图分类号:

O647.9

黄芝, 唐鑫, 邓罡华, 周恩财, 王鸿飞, 郭源. 和频振动光谱研究多晶金电极/溶液界面乙腈分子取向的flip-flop行为[J]. 电化学（中英文）, 2011, 17(2): 134-138.

HUANG Zhi, TANG Xin, DENG Gang-hua, ZHOU En-cai, WANG Hong-fei, GUO Yuan. The Flip-Flop Behavior of Acetonitrile at Au Electrode Surface Investigated by Sum Frequency Generation Vibrational Spectroscopy[J]. Journal of Electrochemistry, 2011, 17(2): 134-138.

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https://electrochem.xmu.edu.cn/CN/Y2011/V17/I2/134

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和频振动光谱研究多晶金电极/溶液界面乙腈分子取向的flip-flop行为

The Flip-Flop Behavior of Acetonitrile at Au Electrode Surface Investigated by Sum Frequency Generation Vibrational Spectroscopy

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