(AuAg)_(144)(SR)_(60) alloy nanomolecules

摘要

(Au-Ag)_(144)(SR)_(60) alloy nanomolecules were synthesized and characterized by ESI mass spectrometry to atomic precision. The number of Ag atoms can be varied by changing the incoming metal ratio and plateaus at ~60. UV-vis data demonstrates that the electronic structure of the nanomolecules can be tuned by incorporation of silver atoms. Based on the proposed 3-shell structure of Au_(144)(SR)_(60), we hypothesize that the Ag atoms are selectively incorporated in to the symmetry equivalent 60-atom shell-having AU_(12), Au_(42), Ag_(60) concentric shells with 30 -SR-Au-SR- protecting units.