Efficient and Monochromatic Electrochemiluminescence of Aqueous‐Soluble Au Nanoclusters via Host–Guest Recognition

Inspired by the enhanced photoluminescence of Au nanoclusters (AuNCs) with a rigid shell, the formation of rigid host–guest assemblies on AuNC surfaces was employed to screen novel electrochemiluminophores with 6‐aza‐2‐thiothymine(ATT)‐protected AuNCs (ATT‐AuNCs) and l‐arginine (ARG) as models for t...

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Bibliographic Details
Published in:Angewandte Chemie 2019-05, Vol.131 (21), p.6975-6979
Main Authors: Yang, Liqiong, Zhang, Bin, Fu, Li, Fu, Kena, Zou, Guizheng
Format: Article
Language:English
Subjects:
Arginine
Assemblies
Au-Nanocluster
Chemistry
Electrochemiluminescence
Elektrochemilumineszenz
Monochromatische Elektrochemiluminophore
Nanoclusters
Photoluminescence
Photons
Wasserlöslichkeit
Wirt-Gast-Erkennung
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Summary:Inspired by the enhanced photoluminescence of Au nanoclusters (AuNCs) with a rigid shell, the formation of rigid host–guest assemblies on AuNC surfaces was employed to screen novel electrochemiluminophores with 6‐aza‐2‐thiothymine(ATT)‐protected AuNCs (ATT‐AuNCs) and l‐arginine (ARG) as models for the first time. The rigid host–guest assemblies formed between ARG and ATT on the ATT‐AuNC surface enabled aqueous‐soluble ARG/ATT‐AuNCs with a dramatically enhanced electrochemiluminescence (ECL) compared to ATT‐AuNCs. This includes one cathodic ECL process (−1.30 V) and three anodic ECL processes (+0.78, 0.90, and 1.05 V) in a so‐called half‐scan experiment without a co‐reactant, as well as a 70‐fold enhanced oxidative‐reduction ECL at +0.78 V with tri‐n‐propylamine as a co‐reactant. Importantly, the ECL of the ARG/ATT‐AuNCs is highly monochromatic with an emission maximum around 532 nm and a full width at half‐maximum of 36 nm, which is of great interest for color‐selective ECL assays. Auf einer Wellenlänge: Eine vielversprechende Strategie zum Screening von umweltfreundlichen, biokompatiblen und effizienten Elektrochemiluminophoren wird vorgestellt. Das Funktionsprinzip beruht auf einer Rigidifizierung der Au‐Nanoclusterschale durch Wirt‐Gast‐Erkennung.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201900115