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Updated: May 6, 2026

In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions
Published on: June 16, 2014
Au103(SR)45, Au104(SR)45, Au104(SR)46 and Au105(SR)46 nanoclusters
Amala Dass1, Praneeth Reddy Nimmala, Vijay Reddy Jupally
1Department of Chemistry and Biochemistry, University of Mississippi, 352 Coulter Hall, Mississippi, MS 38677, USA. amal@olemiss.edu.
Abstract:
High resolution ESI mass spectrometry of the "22 kDa" nanocluster reveals the presence of a mixture containing Au103(SR)45, Au104(SR)45, Au104(SR)46, and Au105(SR)46 nanoclusters, where R = -CH2CH2Ph. MALDI TOF MS data confirm the purity of the sample and a UV-vis spectrum shows minor features. Au102(SC6H5COOH)44, whose XRD crystal structure was recently reported, is not observed. This is due to ligand effects, because the 102 : 44 composition is produced using aromatic ligands. However, the 103-, 104- and 105-atom nanoclusters, protected by -SCH2CH2Ph and -SC6H13 ligands, are at or near 58 electron shell closing.

