TY - JOUR
T1 - Potential and pH Dependencies of Adsorbed Species of 2-, 4-Pyridinethiol and 2-Pyrimidinethiol on Au(111) Electrode
AU - Taniguchi, Isao
AU - Yoshimoto, Soichiro
AU - Sunatsuki, Yukinari
AU - Nlshiyama, Katsuhiko
PY - 1999/12
Y1 - 1999/12
N2 - Potential and pH dependencies of surface structures of Au(111) electrodes modified with 2- and 4-pyridinethiol (2-PySH and 4-PySH, respectively) and 2-pyrimidinethiol (2-PymSH) were examined by surface-enhanced IR absorption spectroscopy (SEIRAS) and STM. At positive potentials, the pKa values of the adsorbed pyridinethiol and pyrimidine species decreased, even in an acid solution the pyridine (or pyrimidine) N atom became less protonated. Therefore, STM images of self-assembled monolayers of these thiols observed at properly positive potentials (e.g.,> ca. 0.3 V vs. Ag/AgCl for 2-PySH and 2-PymSH in a 0.1 M HClO4 solution, >0.7 V vs. Ag/ AgCl for 4-PySH in a 0.01 M (M = mol dm-3) HClO4 solution) can be used for evaluating the structures in a neutral solution.
AB - Potential and pH dependencies of surface structures of Au(111) electrodes modified with 2- and 4-pyridinethiol (2-PySH and 4-PySH, respectively) and 2-pyrimidinethiol (2-PymSH) were examined by surface-enhanced IR absorption spectroscopy (SEIRAS) and STM. At positive potentials, the pKa values of the adsorbed pyridinethiol and pyrimidine species decreased, even in an acid solution the pyridine (or pyrimidine) N atom became less protonated. Therefore, STM images of self-assembled monolayers of these thiols observed at properly positive potentials (e.g.,> ca. 0.3 V vs. Ag/AgCl for 2-PySH and 2-PymSH in a 0.1 M HClO4 solution, >0.7 V vs. Ag/ AgCl for 4-PySH in a 0.01 M (M = mol dm-3) HClO4 solution) can be used for evaluating the structures in a neutral solution.
KW - SEIRAS
KW - STM
KW - Self-assembled monolayer (SAM)
KW - Single crystal electrode
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U2 - 10.5796/electrochemistry.67.1197
DO - 10.5796/electrochemistry.67.1197
M3 - Article
AN - SCOPUS:0141976105
VL - 67
SP - 1197
EP - 1199
JO - Electrochemistry
JF - Electrochemistry
SN - 1344-3542
IS - 12
ER -