Exceptionally Stable Dimers and Trimers of Au25 Clusters Linked with a Bidentate Dithiol: Synthesis,Structure and Chirality Study |
| |
| Authors: | Michal Swierczewski Dr Fabrice Cousin Dr Ewa Banach Dr Arnulf Rosspeintner Dr Latevi Max Lawson Daku Dr Abolfazl Ziarati Dr Rania Kazan Prof Gunnar Jeschke Raymond Azoulay Dr Lay-Theng Lee Prof Thomas Bürgi |
| |
| Institution: | 1. Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland;2. Laboratoire Léon Brillouin, Université Paris-Saclay, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France;3. Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1–5/10, 8093 Zürich, Switzerland |
| |
| Abstract: | A bidentate chiral dithiol (diBINAS) is utilised to bridge Au25 nanoclusters to form oligomers. Separation by size allows the isolation of fractions that are stable thanks to the bidentate nature of the linker. The structure of the products is elucidated by small-angle X-ray scattering and calculated using density functional theory. Additional structural details are studied by diffusion-ordered nuclear magnetic resonance spectroscopy, transmission electron microscopy and matrix-assisted laser desorption/ionization time of flight mass spectrometry. Significant changes in the optical properties are analysed by UV/Vis and fluorescence spectroscopies, with the latter demonstrating a strong emission enhancement. Furthermore, the emergent chiral characteristics are studied by circular dichroism. Due to the geometry constraints of the nanocluster assemblies, diBINAS can be regarded as a templating molecule, taking a step towards the directed self-assembly of metal clusters. |
| |
| Keywords: | Bidentate Dimerization Gold Cluster Self-Assembly Small-Angle X-Ray Scattering |
|
|
