Related Experiment Video
Updated: Apr 29, 2026
Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
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.
None:
Ligand isomerism can effectively modulate the properties of clusters. Herein, a series of alloy (AuAg)13 nanoclusters (NCs) capped by 2- or 4-mercaptopyridine were synthesized and well determined. Results showed that all four NCs exhibit pronounced multiphoton absorption under near-infrared (NIR) excitation, and 4-mercaptopyridine coordinated clusters display significantly enhanced multiphoton absorption coefficients and cross-sections compared with their 2-mercaptopyridine coordinated analogues. Complementary density functional theory and time-dependent density functional theory calculations show that 4-mercaptopyridine ligation shifts the relative positions and densities of excited-state energy levels, alters the states contributing to low-energy absorption, and enhances ligand-to-metal charge transfer (LMCT), thereby accounting for the experimentally observed increase in nonlinear optical response. This work provides an intriguing ligand-engineering strategy and a cluster platform for stepwise control of the nonlinear optical behaviour of (AuAg)13 alloy nanoclusters and sheds light on the precise correlation between the ligand structure and nonlinearity at the atomic level.
Related Concept Videos
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
01:12Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
01:13¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
02:34Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...