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A gold cluster [Au13(dppe)5(EPTpy)2]3+ (dppe = 1,2-bis(diphenylphosphino)ethane, EPTpy-H = 4'-(4-ethynylphenyl)-2,2':6',2''-terpyridine) was synthesized by ligand exchange reaction of [Au13(dppe)5Cl2]3+. Single crystal X-ray diffraction analysis revealed that two terpyridyl moieties were σ-bonded to the coaxial positions of the icosahedral Au13 core. These two terpyridyl moieties were coordinated with 3d metal ions M2+ (M = Co, Ni, Cu, Zn) in acetonitrile solution under ambient conditions. The photoluminescence (PL) of [Au13(dppe)5(EPTpy)2]3+ with quantum yield of 0.17 at ~780 nm was quenched almost completely by coordination with Co2+, Ni2+, and Cu2+, while the PL was not affected by Zn2+ coordination. The metal-dependent PL quenching behavior is ascribed to the difference in the electronic structure of the metal ions. The energy transfer from the Au13 chromophore to the coordinated Co2+, Ni2+, or Cu2+ with open electronic structure proceeds efficiently via an electron exchange mechanism, while the process is prohibited to Zn2+ with closed electronic structure.

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  The copyright belongs to the Chemical Society of Japan.

Keyword: superatom, transmission electron microscopy, photoluminescence, nanocluster, gold

Date published: 2023-09-15

Publisher: The Chemical Society of Japan

Journal:

• BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN (ISSN: 00092673) vol. 96 issue. 9 p. 1045-1051

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4245

First published URL: https://doi.org/10.1246/bcsj.20230148

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Updated at: 2024-01-05 22:11:46 +0900

Published on MDR: 2023-10-11 13:30:24 +0900