Structure‐Dependent Photoluminescence and Chemiluminescence Emission Enhancement in Ag25 Nanoclusters

Surface ligands crucially influence the structure and luminescence of metal nanoclusters (NCs). In this study, three [Ag25(SPhCl)16−xClx(DPPB)6]2+ (x = 0 for Ag25, x = 1 for Ag25‐Cl, and x = 4 for Ag25‐4Cl) featuring thiol and Cl ligand combinations are synthesized and investigated. Ag25‐4Cl, which...

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Bibliographic Details
Published in:Advanced optical materials 2024-08, Vol.12 (24), p.n/a
Main Authors: Jing, Mengmeng, Kuang, Kaiyang, Fang, Chunmin, Zhou, Chuanjun, Li, Zhuoyuan, Chen, Shuang, Zhu, Manzhou
Format: Article
Language:English
Subjects:
Ag25 nanoclusters
antioxidation capacity
Chemiluminescence
Ligands
Luminescence
Nanoclusters
Photoluminescence
Scavenging
Singlet oxygen
Structural analysis
Thiols
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Summary:Surface ligands crucially influence the structure and luminescence of metal nanoclusters (NCs). In this study, three [Ag25(SPhCl)16−xClx(DPPB)6]2+ (x = 0 for Ag25, x = 1 for Ag25‐Cl, and x = 4 for Ag25‐4Cl) featuring thiol and Cl ligand combinations are synthesized and investigated. Ag25‐4Cl, which has the smallest number of rigid thiol ligands, exhibits the strongest photoluminescence (PL) and chemiluminescence (CL), and its PL quantum yield is 73.43% higher than that of Ag25. Structural analysis indicates that Cl ligands, being smaller and less sterically hindering than thiols, compress the motif layer towards the core, reducing non‐radiative transitions and boosting radiative ones to enhance PL. All three NCs exhibit CL in the presence of singlet oxygen, demonstrating the ability of the NCs to react with radicals and scavenge them. CL and radical scavenging experiments show that Ag25‐4Cl exhibits the highest CL and the lowest radical reaction ability, indicating that CL intensity of an NC depends more on its intrinsic luminescence ability and less on its ability to react with radicals. The regulation of luminescence by ligands and the CL and radical‐scavenging behavior of NCs are expected to be extended to other NC systems and related applications. This study explores how surface ligands affect the structure and luminescence of metal nanoclusters (NCs), focusing on three [Ag25(SPhCl)16−xClx(DPPB)6]2+ variants with different thiol and Cl ligand ratios. Ag25‐4Cl shows the highest photoluminescence and chemiluminescence, with significantly enhanced quantum yield due to structural compression by smaller Cl ligands. These findings suggest broader implications for NC technology in luminescence and radical‐scavenging applications.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202400940