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Mixed-Monolayer-Protected Au25 Clusters with Bulky Calix[4]arene Functionalities
Jukka Hassinen1, Petri Pulkkinen2, Elina Kalenius
1†Department of Applied Physics, Aalto University (Helsinki University of Technology), Puumiehenkuja 2, FI-02150 Espoo, Finland.
The Journal of Physical Chemistry Letters
|August 16, 2015
Summary
Researchers developed a simple method to create fluorescent gold clusters (Au25) with tunable bulky calixarene molecules. This breakthrough allows for controlled functionalization of atomic gold clusters, opening new possibilities in nanomaterial design.
Area of Science:
- Nanotechnology
- Materials Science
- Supramolecular Chemistry
Background:
- Functionalizing gold nanoparticles with bulky ligands is common, but challenging for small, atomically precise gold clusters.
- Atomic precision in gold clusters offers unique electronic and optical properties.
Purpose of the Study:
- To develop a straightforward one-pot synthesis for fluorescent magic number Au25 clusters.
- To introduce controlled amounts of bulky calix[4]arene functionalities onto Au25 clusters.
Main Methods:
- One-pot synthesis using binary ligand mixtures of tetrathiolated calix[4]arene and 1-butanethiol.
- Systematic variation of ligand molar ratios to control calixarene functionalization.
- Structural characterization of the resulting gold clusters.
Main Results:
- Successfully synthesized fluorescent Au25 clusters with varying numbers of calix[4]arene moieties (1-8).
- Demonstrated controlled functionalization by adjusting the ratio of calix[4]arene to 1-butanethiol.
- Uncovered an unexpected binding mode of calix[4]arenes to the Au25 surface via two or four thiolates.
Conclusions:
- A facile method for synthesizing functionalized Au25 clusters was established.
- The study highlights the potential for precise control over the surface chemistry of atomic gold clusters.
- The findings provide insights into the ligand-cluster interactions for designing novel nanomaterials.
