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Open Access Chiroptical Properties of Intrinsically Chiral Thiolate-protected Gold Clusters

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Chiral thiolate-protected gold clusters of atomic precision have gained increasing interest in recent years due to their potential use in catalysis, sensing or bioapplications. While the protection of gold clusters with chiral ligands is a rather trivial task, it was found that the clusters can bear intrinsically chiral features, most obvious in the arrangement of the protecting ligands on the surface of the cluster. Recent efforts showed the separation of the enantiomers of such intrinsically chiral gold clusters. This technique can be used for the prediction of chirality in structurally unknown clusters. Activation barriers for the racemization of Au38(SR)24 were determined. As this involves a huge rearrangement of the ligands, the flexibility of the gold-thiolate interface is demonstrated. Furthermore, the ligand exchange reactions between intrinsically chiral clusters and bidentate chiral thiols were studied. A limited, regioselective exchange was found. Most importantly, the reaction is diastereoselective and allows tailoring of gold clusters that are protected with a defined layer of ligands.
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Keywords: CIRCULAR DICHROISM; GOLD CLUSTERS; NANOPARTICLES; STEREOCHEMISTRY

Document Type: Research Article

Affiliations: 1: University of Geneva, Department of Physical Chemistry, Quai Ernest-Ansermet 30, CH-1211 Genève 4, Switzerland. [email protected] 2: University of Geneva, Department of Physical Chemistry, Quai Ernest-Ansermet 30, CH-1211 Genève 4, Switzerland

Publication date: April 1, 2013

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

    CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.

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