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Issue 4, 2015
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Amine-functionalized siloxane oligomer facilitated synthesis of subnanometer colloidal Au particles

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Abstract

Amine-functionalized siloxane oligomers were synthesized and used successfully to prepare colloidal Au particles smaller than 1 nm. Using NMR to follow the interaction of Au(THT)Cl with the functionalized siloxane, it was determined that the amine ligands displaced the THT ligand effectively. By comparison with other functionalized siloxane oligomers/compound, parameters such as density of ligating groups, oligomer steric barrier and reduction rates were found to be essential for the formation and stability of subnanometer Au particles. Without further treatment, the formed Au particles were active catalysts for the reduction of p-nitrobenzaldehyde by triethylsilane, forming an imine as the major coupling product. Deposition of the Au colloids onto silica, followed by thermal treatment to remove the organic groups resulted in subnanometer Au on silica, indicating this to be a promising method of fabricating subnanometer supported Au catalyst.

Graphical abstract: Amine-functionalized siloxane oligomer facilitated synthesis of subnanometer colloidal Au particles

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Article information


Submitted
04 Nov 2014
Accepted
25 Nov 2014
First published
25 Nov 2014

J. Mater. Chem. A, 2015,3, 1743-1751
Article type
Paper
Author version available

Amine-functionalized siloxane oligomer facilitated synthesis of subnanometer colloidal Au particles

Z. Wang, E. V. Beletskiy, S. Lee, X. Hou, Y. Wu, T. Li, M. C. Kung and H. H. Kung, J. Mater. Chem. A, 2015, 3, 1743
DOI: 10.1039/C4TA05954A

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