Key Laboratory of Materials Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
Nanoscale. 2017 Oct 12;9(39):14809-14813. doi: 10.1039/c7nr05239a.
Structural isomerization is an important concept in organic chemistry and it is recently found to be applicable to thiolated gold nanoparticles. However, to the best of our knowledge, the isomerization with the kernel structure of the cluster changed while maintaining fcc packing was not previously found. Here, we report such a structural isomerization by synthesizing a novel gold nanocluster and solving its atomic structure. The as-obtained novel gold nanocluster Au(PET) (PET = phenylethanethiolate) has completely the same Au/S molar ratio as a well-known gold nanocluster Au(TBBT) (TBBT = 4-tert-butyl-benzenethiolate) but an essentially different fcc structure. As a result of fcc structure isomerization, Au(PET) has remarkably different UV/vis/NIR absorption from Au(TBBT). Another interesting finding in this work is that the kernel of Au(PET) has high-indexed (311)-like facets, which is not previously reported in the structures of gold nanoclusters to the best of our knowledge.
结构异构化是有机化学中的一个重要概念，最近发现它也适用于巯基化金纳米粒子。然而，据我们所知，以前没有发现过在保持面心立方堆积的情况下改变团簇内核结构的异构化。在这里，我们通过合成一种新型金纳米团簇并解决其原子结构来报告这种结构异构化。所获得的新型金纳米团簇 Au(PET)（PET = 苯乙硫醇）与众所周知的金纳米团簇 Au(TBBT)（TBBT = 4-叔丁基苯硫醇）具有完全相同的 Au/S 摩尔比，但具有本质上不同的面心立方结构。由于面心立方结构异构化，Au(PET) 的紫外/可见/近红外吸收与 Au(TBBT) 显著不同。这项工作的另一个有趣发现是，Au(PET) 的内核具有高指数（311）样面，这在我们所知的金纳米团簇的结构中以前没有报道过。
