Structure and optical properties of an Ag135Cu60 nanocluster incorporating an Ag135 buckminsterfullerene-like topology
摘要
Metal nanoclusters, particularly those bridging molecular and metallic states, play a crucial role in understanding the relationship between atomic structure and emergent physical properties. Herein we report the synthesis and crystal structure of Ag135Cu60(S(CH2)2Ph)60Cl42 (Ag135Cu60 for short hereafter; −S(CH2)2Ph = phenylethanethiolate), which contains an Ag135 structure derived from the removal of twelve vertices from the 147-atom Mackay icosahedron, further wrapped by copper complexes. Ag135Cu60 was obtained via sodium borohydride reduction of a solution of AgCu-S(CH2)2Ph complexes, and it can be described as a core–shell metal cage Ag13@Ag42@Ag60Ag20@Cl12@Cu60 co-protected by −S(CH2)2Ph and Cl ligands. This shell-by-shell assembly leads to varying electron delocalization owing to changes in the length of metal–metal bonds, giving Ag135Cu60 both molecular and metallic properties leading to unusual power dependencies resulting from molecular-state-directed acoustic oscillations. This research inspires further exploration into customizable metal nanocluster structures and opens up opportunities to study the influence of nanocluster structure on the metallic state. The findings ultimately provide valuable insights for advancing the fields of nanotechnology and materials science, paving the way for innovative applications in developing advanced nanomaterials.