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Updated: Apr 29, 2026
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
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Enhancing multiphoton absorption in atomically precise (AuAg)13 clusters via 2-/4-mercaptopyridine ligand positional
Anqi Xu1, Ye Wang1, Daqiao Hu1
1School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China. 96044@ahu.edu.cn.
Nanoscale
|April 28, 2026
Summary
Alloy nanoclusters (AuAg)13 functionalized with 4-mercaptopyridine show enhanced multiphoton absorption compared to those with 2-mercaptopyridine. This ligand engineering strategy offers precise control over nonlinear optical properties.
Area of Science:
- Nanomaterials Science
- Physical Chemistry
- Optical Engineering
Background:
- Ligand isomerism significantly influences the properties of metal nanoclusters.
- Alloy nanoclusters offer tunable electronic and optical characteristics.
- Multiphoton absorption is crucial for advanced optical applications.
Purpose of the Study:
- To synthesize and characterize (AuAg)13 nanoclusters capped with 2- and 4-mercaptopyridine isomers.
- To investigate the impact of ligand isomerism on multiphoton absorption properties.
- To elucidate the structure-property relationships governing nonlinear optical responses.
Main Methods:
- Synthesis and characterization of alloy nanoclusters.
- Experimental measurement of multiphoton absorption.
- Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations.
Main Results:
- All synthesized (AuAg)13 nanoclusters exhibited multiphoton absorption under near-infrared excitation.
- 4-mercaptopyridine capped clusters showed significantly enhanced absorption coefficients and cross-sections.
- Calculations revealed that 4-mercaptopyridine enhances ligand-to-metal charge transfer and alters excited-state energy levels.
Conclusions:
- Ligand isomerism in mercaptopyridine-capped (AuAg)13 nanoclusters provides a strategy for tuning nonlinear optical properties.
- 4-mercaptopyridine ligation leads to superior multiphoton absorption compared to 2-mercaptopyridine.
- Atomic-level understanding of ligand structure-nonlinearity correlation is achieved.
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