Controlled reduction for size selective synthesis of thiolate-protected gold nanoclusters Aun(n = 20, 24, 39, 40)
1 Department of Chemistry, Anhui University, Hefei, Anhui, 230026, People’s Republic of China
2 Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA
Nanoscale Research Letters 2012, 7:277 doi:10.1186/1556-276X-7-277Published: 30 May 2012
Additional file 1:
Mass spectrum in the range of m/z 2,000 to 8,000 and comparison of the UV-vis spectrum. Figure S1 shows the ESI mass spectrum in the range of m/z 2,000 to 8,000. Residual Au24(SC2H4Ph)20 clusters (in mono-Cs adducts) were observed at m/z 7603. The low mass portion contains all (CsAc)nCs + signals with equal spacing of 191.9 (=CsAc), for example, the m/z 2,051.99 is assigned to (CsAc)10Cs+. Figure S2 shows the comparison of the UV-vis spectrum of the crude products (profile a) and of the purified Au25(SC2H4Ph)18 nanoclusters (profile b).
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