Cucurbiturils brighten Au nanoclusters in water.

Chemical Science
Tao JiangHe Tian

Abstract

Gold nanoclusters (AuNCs) with well-defined atomically precise structures present promising emissive prospects for excellent biocompatibility and optical properties. However, the relatively low luminescence efficiency in solutions for most AuNCs is still a perplexing issue to be resolved. In this study, a facile supramolecular strategy was developed to rigidify the surface of FGGC-AuNCs by modifying transition rates in excited states via host-guest self-assembly between cucurbiturils (CBs) and FGGC (Phe-Gly-Gly-Cys peptide). In aqueous solutions, CB/FGGC-AuNCs presented an extremely enhanced red phosphorescence emission with a quantum yield (QY) of 51% for CB[7] and 39% for CB[8], while simple FGGC-AuNCs only showed a weak emission with a QY of 7.5%. Furthermore, CB[7]/FGGC-AuNCs showed excellent results in live cell luminescence imaging for A549 cancer cells. Our study demonstrates that host-guest self-assembly assisted by macrocycles is a facile and effective tool to non-covalently modify and adjust optical properties of nanostructures on ultra-small scales.

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Citations

Feb 9, 2021·ACS Applied Materials & Interfaces·Ming LiuXin Xiao
Jun 25, 2021·Chemical Science·Jimmy MaillardAlexandre Fürstenberg
Oct 12, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Na-Na LiShuang-Quan Zang

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Methods Mentioned

BETA
a surface plasmon
Nuclear Magnetic Resonance
NMR
Isothermal Titration Calorimetry

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