First enantioseparation and circular dichroism spectra of Au38 clusters protected by achiral ligands.

First enantioseparation and circular dichroism spectra of Au38 clusters protected by achiral ligands.
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DOI:
10.1038/ncomms1802
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发表时间:
2012-04-24
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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赋予金属手性是多相催化和现代光学等领域的核心。虽然金属的体相是对称的,但它们的表面可以通过吸附分子而成为手性的。有趣的是,即使是非手性分子也可以导致局部手性,尽管整体上是外消旋的表面。对于金属颗粒或团簇可以获得类似的情况。在这里,我们报告的第一个分离的对映体的金簇保护的非手性硫醇盐,金38(SCH2CH2Ph)24,实现了手性高效液相色谱。纳米团簇的手性来自于其表面上硫醇盐的手性排列,形成“主食图案”。对映异构体显示镜像圆二色性响应和高达4×10−3的大各向异性因子。与报道的其他Au 38团簇的圆二色性光谱的比较表明,对手性性质的配体的影响是轻微的。 用非手性硫醇盐保护的金原子簇可以显示手性,这种手性纳米颗粒可以在催化和传感方面开辟新的可能性。在这里,第一次分离的对映体的金簇,保护的非手性硫醇盐,Au 38(SCH2CH 2Ph)24,实现。
Bestowing chirality to metals is central in fields such as heterogeneous catalysis and modern optics. Although the bulk phase of metals is symmetric, their surfaces can become chiral through adsorption of molecules. Interestingly, even achiral molecules can lead to locally chiral, though globally racemic, surfaces. A similar situation can be obtained for metal particles or clusters. Here we report the first separation of the enantiomers of a gold cluster protected by achiral thiolates, Au38(SCH2CH2Ph)24, achieved by chiral high-performance liquid chromatography. The chirality of the nanocluster arises from the chiral arrangement of the thiolates on its surface, forming 'staple motifs'. The enantiomers show mirror-image circular dichroism responses and large anisotropy factors of up to 4×10−3. Comparison with reported circular dichroism spectra of other Au38 clusters reveals that the influence of the ligand on the chiroptical properties is minor. Clusters of gold atoms protected with achiral thiolates can display chirality, and such chiral nanoparticles could open new possibilities in catalysis and sensing. Here, the first separation of the enantiomers of a gold cluster, protected by achiral thiolates, Au38(SCH2CH2Ph)24, is achieved.
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