Surface Dynamics and Ligand-Core Interactions of Quantum Sized Photoluminescent Gold Nanoclusters

Lin, Y, Charchar, P, Christofferson, A, Thomas, M, Todorova, N, Mazo, M, Chen, Q, Doutch, J, Richardson, R, Yarovsky, I and Stevens, M 2018, 'Surface Dynamics and Ligand-Core Interactions of Quantum Sized Photoluminescent Gold Nanoclusters', Journal of the American Chemical Society, vol. 140, pp. 18217-18226.


Document type: Journal Article
Collection: Journal Articles

Title Surface Dynamics and Ligand-Core Interactions of Quantum Sized Photoluminescent Gold Nanoclusters
Author(s) Lin, Y
Charchar, P
Christofferson, A
Thomas, M
Todorova, N
Mazo, M
Chen, Q
Doutch, J
Richardson, R
Yarovsky, I
Stevens, M
Year 2018
Journal name Journal of the American Chemical Society
Volume number 140
Start page 18217
End page 18226
Total pages 10
Publisher American Chemical Society
Abstract Quantum-sized metallic clusters protected by biological ligands represent a new class of luminescent materials; yet the understanding of structural information and photoluminescence origin of these ultrasmall clusters remains a challenge. Herein we systematically study the surface ligand dynamics and ligand-metal core interactions of peptide-protected gold nanoclusters (AuNCs) with combined experimental characterizations and theoretical molecular simulations. We show that the peptide sequence plays an important role in determining the surface peptide structuring, interfacial water dynamics and ligand-Au core interaction, which can be tailored by controlling peptide acetylation, constituent amino acid electron donating/withdrawing capacity, aromaticity/hydrophobicity and by adjusting environmental pH. Specifically, emission enhancement is achieved through increasing the electron density of surface ligands in proximity to the Au core, discouraging photoinduced quenching, and by reducing the amount of surface-bound water molecules. These findings provide key design principles for understanding the surface dynamics of peptide-protected nanoparticles and maximizing the photoluminescence of metallic clusters through the exploitation of biologically relevant ligand properties.
Subject Theoretical and Computational Chemistry not elsewhere classified
DOI - identifier 10.1021/jacs.8b04436
Copyright notice © 2018 American Chemical Society
ISSN 0002-7863
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