title: Au103(SR)45, Au104(SR)45, Au104(SR)46 and Au105(SR)46 nanoclusters.
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.
authors.affiliation: Department of Chemistry and Biochemistry, University of Mississippi, 352 Coulter Hall, Mississippi, MS 38677, USA. amal@olemiss.edu.
authors.forename: Amala
authors.initials: A
authors.lastname: Dass
authors.forename: Praneeth Reddy
authors.initials: PR
authors.lastname: Nimmala
authors.forename: Vijay Reddy
authors.initials: VR
authors.lastname: Jupally
authors.forename: Nuwan
authors.initials: N
authors.lastname: Kothalawala