Abstract
We report the synthesis and electrochemical characterization of a new water-soluble Au 25 cluster protected with (3-mercaptopropyl) sulfonate. The presence of sulfonate terminal groups on the surface of the cluster enabled facile phase transfer of the water-soluble cluster to organic phase by ion-pairing with hydrophobic counterions. The phase-transferred form of the water-soluble Au 25 cluster was found to retain its integrity and allowed investigation of its electrochemical properties in organic media. The voltammetric investigation of the phase-transferred Au 25 cluster in mixtures of CH 2Cl 2 and toluene has revealed that the cluster exhibits the characteristic Au 25 peak pattern, but the electrochemical HOMO-LUMO energy gap of the cluster varies from 1.39 to 1.66 V depending on the solvent polarity. The origin of the solvent dependence is explained by the electrostatic field effect of the sulfonate anion on the redox potentials of the Au 25 cluster.
| Original language | English |
|---|---|
| Pages (from-to) | 2476-2481 |
| Number of pages | 6 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 3 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - 2012 Sep 6 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physical and Theoretical Chemistry
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Electrochemical characterization of water-soluble Au 25 nanoclusters enabled by phase-transfer reaction. / Kwak, Kyuju; Lee, Dongil.
In: Journal of Physical Chemistry Letters, Vol. 3, No. 17, 06.09.2012, p. 2476-2481.Research output: Contribution to journal › Article
TY - JOUR
T1 - Electrochemical characterization of water-soluble Au 25 nanoclusters enabled by phase-transfer reaction
AU - Kwak, Kyuju
AU - Lee, Dongil
PY - 2012/9/6
Y1 - 2012/9/6
N2 - We report the synthesis and electrochemical characterization of a new water-soluble Au 25 cluster protected with (3-mercaptopropyl) sulfonate. The presence of sulfonate terminal groups on the surface of the cluster enabled facile phase transfer of the water-soluble cluster to organic phase by ion-pairing with hydrophobic counterions. The phase-transferred form of the water-soluble Au 25 cluster was found to retain its integrity and allowed investigation of its electrochemical properties in organic media. The voltammetric investigation of the phase-transferred Au 25 cluster in mixtures of CH 2Cl 2 and toluene has revealed that the cluster exhibits the characteristic Au 25 peak pattern, but the electrochemical HOMO-LUMO energy gap of the cluster varies from 1.39 to 1.66 V depending on the solvent polarity. The origin of the solvent dependence is explained by the electrostatic field effect of the sulfonate anion on the redox potentials of the Au 25 cluster.
AB - We report the synthesis and electrochemical characterization of a new water-soluble Au 25 cluster protected with (3-mercaptopropyl) sulfonate. The presence of sulfonate terminal groups on the surface of the cluster enabled facile phase transfer of the water-soluble cluster to organic phase by ion-pairing with hydrophobic counterions. The phase-transferred form of the water-soluble Au 25 cluster was found to retain its integrity and allowed investigation of its electrochemical properties in organic media. The voltammetric investigation of the phase-transferred Au 25 cluster in mixtures of CH 2Cl 2 and toluene has revealed that the cluster exhibits the characteristic Au 25 peak pattern, but the electrochemical HOMO-LUMO energy gap of the cluster varies from 1.39 to 1.66 V depending on the solvent polarity. The origin of the solvent dependence is explained by the electrostatic field effect of the sulfonate anion on the redox potentials of the Au 25 cluster.
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U2 - 10.1021/jz301059w
DO - 10.1021/jz301059w
M3 - Article
AN - SCOPUS:84865980066
VL - 3
SP - 2476
EP - 2481
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 17
ER -