Bis-Schiff base linkage-triggered highly bright luminescence of gold nanoclusters in aqueous solution at the single-cluster level

Haohua Deng, Kaiyuan Huang, Lingfang Xiu, Weiming Sun, Qiaofeng Yao, Xiangyu Fang, Xin Huang, Hamada A. A. Noreldeen, Huaping Peng, Jianping Xie () and Wei Chen ()
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Haohua Deng: Fujian Medical University
Kaiyuan Huang: Fujian Medical University
Lingfang Xiu: Fujian Medical University
Weiming Sun: Fujian Medical University
Qiaofeng Yao: National University of Singapore
Xiangyu Fang: Fujian Medical University
Xin Huang: Fujian Medical University
Hamada A. A. Noreldeen: Fujian Medical University
Huaping Peng: Fujian Medical University
Jianping Xie: National University of Singapore
Wei Chen: Fujian Medical University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Metal nanoclusters (NCs) have been developed as a new class of luminescent nanomaterials with potential applications in various fields. However, for most of the metal NCs reported so far, the relatively low photoluminescence quantum yield (QY) in aqueous solution hinders their applications. Here, we describe the utilization of bis-Schiff base linkages to restrict intramolecular motion of surface motifs at the single-cluster level. Based on Au22(SG)18 (SG: glutathione) NCs, an intracluster cross-linking system was constructed with 2,6-pyridinedicarboxaldehyde (PDA), and water-soluble gold NCs with luminescence QY up to 48% were obtained. The proposed approach for achieving high emission efficiency can be extended to other luminescent gold NCs with core-shell structure. Our results also show that the content of surface-bound Au(I)-SG complexes has a significant impact on the PDA-induced luminescence enhancement, and a high ratio of Au(I)-SG will be beneficial to increasing the photoluminescence intensity of gold NCs.

Date: 2022
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DOI: 10.1038/s41467-022-30760-3

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