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Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications
Published on: March 22, 2020
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Heterochiral Self-Discrimination Driven Dimerization of Polynuclear Gold(I)-Sulfido Complexes with Enhanced
Liang-Liang Yan1, Ziyong Chen1, Vivian Wing-Wah Yam1
1Institute of Molecular Functional Materials, State Key Laboratory of Synthetic Chemistry, and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, 999077, P. R. China.
Angewandte Chemie (International Ed. in English)
|December 7, 2024
Summary
New chiral gold(I) clusters self-assemble into larger structures, enhancing near-infrared luminescence. This discovery offers insights into heterochiral self-sorting and assembly mechanisms for advanced materials.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Chiral gold(I) clusters are of interest for their unique structural and photophysical properties.
- Developing novel assembly strategies for metal clusters is crucial for designing advanced functional materials.
Purpose of the Study:
- To synthesize decanuclear chiral gold(I) sulfido clusters using specific SDP ligands.
- To investigate the self-assembly of these clusters into larger achiral heterodimers.
- To explore the luminescent properties and assembly mechanisms of these gold clusters.
Main Methods:
- Synthesis of decanuclear chiral gold(I) sulfido clusters (SSDP-Au10 and RSDP-Au10) utilizing SDP ligands.
- Formation of an achiral heterodimer icosanuclear meso-cluster (mesoSDP-Au20) by mixing enantiomers.
- Characterization of photoluminescence properties, including emission maxima and quantum yields.
Main Results:
- Successful assembly of decanuclear chiral gold(I) sulfido clusters.
- Formation of an achiral meso-cluster through 1:1 mixing of enantiomers.
- Observation of intense near-infrared (NIR) luminescence (λmax ≈ 750 nm) in the solid state.
- Significant enhancement of photoluminescence quantum yield (PLQY) from 8% to 25% in the meso-cluster.
- Dimerization process found to be sensitive to solvent polarity and ligand configuration.
Conclusions:
- The study demonstrates a facile method for creating larger gold clusters with enhanced luminescence.
- The findings provide a platform for understanding heterochiral self-sorting and assembly.
- This work opens avenues for designing novel NIR-emitting materials based on chiral gold clusters.
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