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Interactions between Ultrastable Na4Ag44(SR)30 Nanoclusters and Coordinating Solvents: Uncovering the Atomic-scale Mechanism

preprint
submitted on 01.06.2020 and posted on 03.06.2020 by Daniel M. Chevrier, Brian E. Conn, Bo Li, De-En Jiang, Terry P. Bigioni, Amares Chatt, Peng Zhang
We report the mechanism on the ultrahigh stability of Na4Ag44(SR)30 by uncovering how coordinating solvents interact with the Na4Ag44(SR)30 nanocluster at the atomic scale. Through synchrotron X-ray experiments and theoretical calculations, it was found that strongly coordinating aprotic solvents interact with surface Ag atoms, particularly between ligand bundles, which compresses the Ag core and relaxes surface metal-ligand interactions. Furthermore, water was used as a cosolvent to demonstrate that semi-aqueous conditions play an important role in protecting exposed surface regions and can further influence the local structure of the silver nanocluster itself. Notably, under semi-aqueous conditions, aprotic coordinating solvent molecules preferentially remain on the metal surface while water molecules interact with ligands, and ligand bundling persisted across the varied solvation conditions.

Funding

NSERC Discovery Grant

NSF grants #0955148 and #1905262

DOE DE-AC02-06CH11357 and DE-AC02-05CH11231

History

Email Address of Submitting Author

peng.zhang@dal.ca

Institution

Dalhousie University

Country

Canada

ORCID For Submitting Author

0000-0003-3603-0175

Declaration of Conflict of Interest

No conflict of interest

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