TY - JOUR
T1 - Hexanethiolate monolayer protected 38 gold atom cluster
AU - Jimenez, Victoria L.
AU - Georganopoulou, Dimitra G.
AU - White, Ryan J.
AU - Harper, Amanda S.
AU - Mills, Allan J.
AU - Lee, Dongil
AU - Murray, Royce W.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2004/8/3
Y1 - 2004/8/3
N2 - The nucleation-growth-passivation Brust reaction has been modified so as to enrich the product in useful quantities of a 38-atom gold nanoparticle coated with a hexanethiolate monolayer. Two modifications are described, using -78°C reduction temperature and a hyperexcess of thiol. Compositional evidence is presented that establishes the product as a Au 38(C6) 24 hexanethiolate monolayer protected cluster (MPC), based on transmission electron microscopy, laser ionization-desorption mass spectrometry, thermogravimetric analysis, and elemental analysis. Reverse phase HPLC confirms the relatively good monodispersity of the MPC products, but high-resolution double-column HPLC reveals that the MPCs are a mixture of closely related but chromatographically distinct products. Voltammetry, low energy spectrophotometry, and spectroelectrochemistry reveal, respectively, a 1.6 eV electrochemical energy gap between the first oxidation and the first reduction, an optical HOMO-LUMO energy absorbance edge at 1.3 eV, and a bleaching of optical absorbance near the 1.3 eV band edge that accompanies electrochemical oxidation of the nanoparticle.
AB - The nucleation-growth-passivation Brust reaction has been modified so as to enrich the product in useful quantities of a 38-atom gold nanoparticle coated with a hexanethiolate monolayer. Two modifications are described, using -78°C reduction temperature and a hyperexcess of thiol. Compositional evidence is presented that establishes the product as a Au 38(C6) 24 hexanethiolate monolayer protected cluster (MPC), based on transmission electron microscopy, laser ionization-desorption mass spectrometry, thermogravimetric analysis, and elemental analysis. Reverse phase HPLC confirms the relatively good monodispersity of the MPC products, but high-resolution double-column HPLC reveals that the MPCs are a mixture of closely related but chromatographically distinct products. Voltammetry, low energy spectrophotometry, and spectroelectrochemistry reveal, respectively, a 1.6 eV electrochemical energy gap between the first oxidation and the first reduction, an optical HOMO-LUMO energy absorbance edge at 1.3 eV, and a bleaching of optical absorbance near the 1.3 eV band edge that accompanies electrochemical oxidation of the nanoparticle.
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U2 - 10.1021/la049274g
DO - 10.1021/la049274g
M3 - Article
C2 - 15274597
AN - SCOPUS:4043101828
VL - 20
SP - 6864
EP - 6870
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 16
ER -