Tri-icosahedral Gold Nanocluster [Au37(PPh3)10(SC2H4Ph)10X2]+: Linear Assembly of Icosahedral Building Blocks

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• 作者：Renxi Jin ; Chong Liu ; Shuo Zhao ; Anindita Das ; Hongzhu Xing ; Chakicherla Gayathri ; Yan Xing ; Nathaniel L. Rosi ; Roberto R. Gil ; Rongchao Jin
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：August 25, 2015
• 年：2015
• 卷：9
• 期：8
• 页码：8530-8536
• 全文大小：476K
• ISSN：1936-086X

文摘

The [Au₃₇(PPh₃)₁₀(SR)₁₀X₂]⁺ nanocluster (where SR = thiolate and X = Cl/Br) was theoretically predicted in 2007, but since then, there has been no experimental success in the synthesis and structure determination. Herein, we report a kinetically controlled, selective synthesis of [Au₃₇(PPh₃)₁₀(SC₂H₄Ph)₁₀X₂]⁺ (counterion: Cl^{鈥?/sup> or Br鈥?/sup>) with its crystal structure characterized by X-ray crystallography. This nanocluster shows a rod-like structure assembled from three icosahedral Au₁₃ units in a linear fashion, consistent with the earlier prediction. The optical absorption and the electrochemical and catalytic properties are investigated. The successful synthesis of this new nanocluster allows us to gain insight into the size, structure, and property evolution of gold nanoclusters that are based upon the assembly of icosahedral units (i.e., cluster of clusters). Some interesting trends are identified in the evolution from the monoicosahedral [Au₁₃(PPh₃)₁₀X₂]3+ to the bi-icosahedral [Au₂₅(PPh₃)₁₀(SC₂H₄Ph)₅X₂]2+ and to the tri-icosahedral [Au₃₇(PPh₃)₁₀(SC₂H₄Ph)₁₀X₂]+ nanocluster, which also points to the possibility of achieving even longer rod nanoclusters based upon assembly of icosahedral building blocks.}