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

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  • Igor Dolamic

    (Université de Genève)

  • Stefan Knoppe

    (Université de Genève)

  • Amala Dass

    (University of Mississippi)

  • Thomas Bürgi

    (Université de Genève)

Abstract

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.

Suggested Citation

  • Igor Dolamic & Stefan Knoppe & Amala Dass & Thomas Bürgi, 2012. "First enantioseparation and circular dichroism spectra of Au38 clusters protected by achiral ligands," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1802
    DOI: 10.1038/ncomms1802
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    Cited by:

    1. Chang Liu & Yan Zhao & Tai-Song Zhang & Cheng-Bo Tao & Wenwen Fei & Sheng Zhang & Man-Bo Li, 2023. "Asymmetric transformation of achiral gold nanoclusters with negative nonlinear dependence between chiroptical activity and enantiomeric excess," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Haohua Deng & Kaiyuan Huang & Lingfang Xiu & Weiming Sun & Qiaofeng Yao & Xiangyu Fang & Xin Huang & Hamada A. A. Noreldeen & Huaping Peng & Jianping Xie & Wei Chen, 2022. "Bis-Schiff base linkage-triggered highly bright luminescence of gold nanoclusters in aqueous solution at the single-cluster level," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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