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59电子非幻数金纳米团簇Au99(C≡CR)40显示高稳定性
作者:小柯机器人 发布时间:2022/1/12 10:24:23

清华大学王泉明团队合成了59电子非幻数金纳米团簇Au99(C≡CR)40,显示出人意料的高稳定性。相关研究成果发表在2022年1月7日出版的《美国化学会杂志》。

研究人员合成了具有59个价电子的原子分辨金纳米团簇Au99(C≡CC6H3-2,4-F2)40(Au99)。单晶X射线衍射显示其Au79内核是一个由两个Au15单元覆盖的Au49标记的十面体。Au99的表面结构由20个线性Au(C)≡CR)2组成个U形钉。在这些D5对称团簇之间观察到团簇间相互作用。磁测量证实了不成对电子的存在。

有趣的是,该开壳金簇Au99在80°C的甲苯溶液中保持完整一周多,并且在电化学条件下具有良好的充放电能力。对称核周围紧凑的配位体外壳保护,实现了高稳定性。

研究工作表明,几何因素可能在决定金属纳米团簇的稳定性方面发挥关键作用,即使该团簇具有开壳电子结构。

附:英文原文

Title: A 59-Electron Non-Magic-Number Gold Nanocluster Au99(C≡CR)40 Showing Unexpectedly High Stability

Author: Jiao-Jiao Li, Zhikun Liu, Zong-Jie Guan, Xu-Shuang Han, Wan-Qi Shi, Quan-Ming Wang

Issue&Volume: January 7, 2022

Abstract: An atomically resolved gold nanocluster Au99(C≡CC6H3-2,4-F2)40 (Au99) with an unusual 59 valence electrons has been synthesized. Single-crystal X-ray diffraction reveals that its Au79 kernel is a Au49 Marks decahedron capped by two Au15 units. The surface structure of Au99 consists of 20 linear Au(C≡CR)2 staples. Intercluster interactions are observed between these D5 symmetric clusters. The existence of an unpaired electron is verified by magnetic measurement. Interestingly, this open-shell gold cluster Au99 stays intact in toluene solution at 80 °C for more than a week, and it has good charging–discharging capability under electrochemical conditions. The compact ligand shell protection around the symmetric core accounts for the high stability. This work suggests that geometric factors may play a crucial role in determining the stability of a metal nanocluster, even though the cluster has an open-shell electronic structure.

DOI: 10.1021/jacs.1c11643

Source: https://pubs.acs.org/doi/10.1021/jacs.1c11643

 

期刊信息

JACS:《美国化学会志》,创刊于1879年。隶属于美国化学会,最新IF:14.612
官方网址:https://pubs.acs.org/journal/jacsat
投稿链接:https://acsparagonplus.acs.org/psweb/loginForm?code=1000