Atomic Structure of Self-Assembled Monolayer of Thiolates on a Tetragonal Au92 Nanocrystal

详细信息    查看全文

• 作者：Chenjie Zeng ; Chong Liu ; Yuxiang Chen ; Nathaniel L. Rosi ; Rongchao Jin
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：138
• 期：28
• 页码：8710-8713
• 全文大小：389K
• 年卷期：0
• ISSN：1520-5126

文摘

Unveiling the ligand binding mode on the crystalline surfaces is important for deciphering the long-standing structural enigma in self-assembled monolayers (SAMs). Here, the binding and patterning structures of thiolates (SR) on the Au(100) crystalline facet are revealed on the basis of the atomic structure of a highly regular, single crystalline Au₉₂(SR)₄₄ nanocrystal. The six exposed facets of this tetragonal nanocrystal give rise to six pieces of “nanoSAMs”. We found that thiolates bind to the planar (100) facets of the nanocrystal via a simple bridge-like mode and are assembled into an overlayer with c(2 × 2) symmetry. The Au–S binding mode and translational symmetry in the kernel and on the surface of the Au₉₂ nanocrystal can be generalized infinitely to construct the bulk two-dimensional SAMs and various tetragonal nanocrystals.