title: Size-dependent molecule-like to plasmonic transition in water-soluble glutathione stabilized gold nanomolecules.
abstract: A size-dependent transition from molecule-like to plasmonic behaviour is demonstrated in the case of water soluble Au:SG nanomolecules. This was achieved using PAGE separation of smaller and larger nanomolecules, resulting in an unprecedented 26 bands, in a wide-range from 10's to 1000's of Au-atoms. PAGE separation of larger plasmonic nanomolecules is demonstrated for the first time. High resolution ESI-MS, with isotopic resolution, of smaller nanoparticles is reported, including the first time report of Au43(SG)26. This report will aid in the fundamental understanding of size-dependent properties of nanomolecules. The synthetic procedure employs a green approach with non-toxic chemicals and processes. The water solubility, non-toxicity and biocompatibility will lead to applications in biomedicine.
authors.affiliation: Department of Chemistry and Biochemistry, University of Mississippi, 352 Coulter Hall, University, 38677 Mississippi, USA. amal@olemiss.edu.
authors.forename: Nuwan
authors.initials: N
authors.lastname: Kothalawala
authors.forename: James Lee
authors.initials: JL
authors.lastname: West
authors.forename: Amala
authors.initials: A
authors.lastname: Dass
mesh_terms: D004591:Electrophoresis, Polyacrylamide Gel; D005978:Glutathione / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D020349:Surface Plasmon Resonance; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D006046:Gold; D005978:Glutathione