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Department of Chemistry and Biochemistry, University of Mississippi, 352 Coulter Hall, University, Mississippi, USA
E-mail: amal@olemiss.edu
; Fax: +1 662 915 7300
; Tel: +1 915 7301
Nanoscale, 2011,3, 3064-3067
DOI:
10.1039/C1NR10429B
Received
28 Apr 2011,
Accepted
23 May 2011
First published online
13 Jul 2011
(Au-Ag)144(SR)60 alloy nanomolecules were synthesized and characterized by ESI mass spectrometry to atomic precision. The number of Ag atoms can be varied by changing the incoming metal ratio and plateaus at 60. UV-vis data demonstrates that the electronic structure of the nanomolecules can be tuned by incorporation of silver atoms. Based on the proposed 3-shell structure of Au144(SR)60, we hypothesize that the Ag atoms are selectively incorporated in to the symmetry equivalent 60-atom shell—having Au12, Au42, Ag60 concentric shells with 30 –SR–Au–SR– protecting units.
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