title: Au(144-x)Cu(x)(SC6H13)60 nanomolecules: effect of Cu incorporation on composition and plasmon-like peak emergence in optical spectra.
abstract: Au144-xCux(SR)60 alloy nanomolecules were synthesized and characterized by using ESI-MS to atomic precision. A maximum of 23 copper atoms replace the gold atoms. When the number of copper atoms is higher than eight, a surface plasmon-like peak appears at ∼520 nm. Based on the fundamental elemental properties of Au and Cu, we predict a mixed atomic ordering and incorporation of Cu atoms into the Au12 and Au42 shells of the proposed icosahedral structure model of the 144-atom nanomolecule.
authors.affiliation: Department of Chemistry and Biochemistry, University of Mississippi, 352 Coulter Hall, University, 38677 Mississippi, USA. amal@olemiss.edu.
authors.forename: Asantha C
authors.initials: AC
authors.lastname: Dharmaratne
authors.forename: Amala
authors.initials: A
authors.lastname: Dass
mesh_terms: D003300:Copper / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry*; D055620:Optical Phenomena; D009942:Organometallic Compounds / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D009942:Organometallic Compounds; D006046:Gold; D003300:Copper