Abstract
The redox reactions of cytochrome c (cyt c) adsorbed on self-assembled monolayers (SAMs) of 4-mercaptobenzoic acid (4-MBA) and 4-mercaptohydrocinnamic acid (4-MHCA) are studied using cyclic voltammetry and ER spectroscopy. A monolayer of cyt c in a stable, electroactive state is formed on close-packed monolayers of both aromatic thiols. The redox potentials of cyt c are 35 mV for 4-MBA and 20 mV vs. Ag/AgCl for 4-MHCA. The electron transfer (ET) rate constants, ke1, of cyt cat pH 7 are determined from the frequency dependence of the ER response to be 1800 s-1 for 4-MBA system and 3900 s-1 for 4-MHCA. The Ke1 of adsorbed cyt c tends to be larger on the SAMs of both aromatic thiols than on the SAM of 6-mercaptohexanoic acid having a similar thickness, suggesting that the difference in the SAM structure is reflected to the Ke1 of cyt c.
| Original language | English |
|---|---|
| Pages (from-to) | 467-470 |
| Number of pages | 4 |
| Journal | Electrochemistry |
| Volume | 65 |
| Issue number | 6 |
| Publication status | Published - 1997 |
| Externally published | Yes |
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Keywords
- Cyt c
- ER spectroscopy
- Mercaptobenzoic acid
- Self-assembled monolayer
ASJC Scopus subject areas
- Electrochemistry
Cite this
Redox reactions of cytochrome c on self-assembled monolayers of mercaptobenzoic acid and mercaptohydrocinnamic acid absorbed on Au (111) electrodes. / Imabayashi, Shinichiro; Mita, Takahiro; Feng, Zhi Qiang; Iida, Minehiko; Niki, Katsumi; Kakiuchi, Takashi.
In: Electrochemistry, Vol. 65, No. 6, 1997, p. 467-470.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Redox reactions of cytochrome c on self-assembled monolayers of mercaptobenzoic acid and mercaptohydrocinnamic acid absorbed on Au (111) electrodes
AU - Imabayashi, Shinichiro
AU - Mita, Takahiro
AU - Feng, Zhi Qiang
AU - Iida, Minehiko
AU - Niki, Katsumi
AU - Kakiuchi, Takashi
PY - 1997
Y1 - 1997
N2 - The redox reactions of cytochrome c (cyt c) adsorbed on self-assembled monolayers (SAMs) of 4-mercaptobenzoic acid (4-MBA) and 4-mercaptohydrocinnamic acid (4-MHCA) are studied using cyclic voltammetry and ER spectroscopy. A monolayer of cyt c in a stable, electroactive state is formed on close-packed monolayers of both aromatic thiols. The redox potentials of cyt c are 35 mV for 4-MBA and 20 mV vs. Ag/AgCl for 4-MHCA. The electron transfer (ET) rate constants, ke1, of cyt cat pH 7 are determined from the frequency dependence of the ER response to be 1800 s-1 for 4-MBA system and 3900 s-1 for 4-MHCA. The Ke1 of adsorbed cyt c tends to be larger on the SAMs of both aromatic thiols than on the SAM of 6-mercaptohexanoic acid having a similar thickness, suggesting that the difference in the SAM structure is reflected to the Ke1 of cyt c.
AB - The redox reactions of cytochrome c (cyt c) adsorbed on self-assembled monolayers (SAMs) of 4-mercaptobenzoic acid (4-MBA) and 4-mercaptohydrocinnamic acid (4-MHCA) are studied using cyclic voltammetry and ER spectroscopy. A monolayer of cyt c in a stable, electroactive state is formed on close-packed monolayers of both aromatic thiols. The redox potentials of cyt c are 35 mV for 4-MBA and 20 mV vs. Ag/AgCl for 4-MHCA. The electron transfer (ET) rate constants, ke1, of cyt cat pH 7 are determined from the frequency dependence of the ER response to be 1800 s-1 for 4-MBA system and 3900 s-1 for 4-MHCA. The Ke1 of adsorbed cyt c tends to be larger on the SAMs of both aromatic thiols than on the SAM of 6-mercaptohexanoic acid having a similar thickness, suggesting that the difference in the SAM structure is reflected to the Ke1 of cyt c.
KW - Cyt c
KW - ER spectroscopy
KW - Mercaptobenzoic acid
KW - Self-assembled monolayer
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UR - http://www.scopus.com/inward/citedby.url?scp=2442500951&partnerID=8YFLogxK
M3 - Article
VL - 65
SP - 467
EP - 470
JO - Electrochemistry
JF - Electrochemistry
SN - 1344-3542
IS - 6
ER -