Variations in electronic states of coumarin hexanethiolate-labeled i-Au²⁵ and bi-Au²⁵ clusters

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https://link.springer.com/article/10.1557/mrc.2019.113

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https://doi.org/10.1557/mrc.2019.113
 http://hdl.handle.net/11603/21320

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2019-09-20

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Meola, Angela; Hondrogiannis, Nicole; Brown, Pierce; Zhukovskyi, Maksym; Zheng, Zheng; Rosenzweig, Zeev; Reber, Keith; Devadas, Mary Sajini; Variations in electronic states of coumarin hexanethiolate-labeled i-Au²⁵ and bi-Au²⁵ clusters; MRS Communications volume 9, 992–1000(2019); https://link.springer.com/article/10.1557/mrc.2019.113

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Abstract

Au₂₅(C₆H₁₄S)₁₈ - icosahedron and [Au₂₅(PPh)₁₀(C₆H₁₄S)₅Cl₂]²⁺ bi-icosahedron clusters were synthesized. Ligand exchange reactions were carried out with a new coumarin-derived fluorophore (Cou-SH) to label both clusters. Labeled and unlabeled Au²⁵ were compared and the changes in the electronic structure were determined. The labeled clusters showed marked changes in electronic states, as evidenced by the quenching in the UV region and enhancement in the near infrared. The quantum yield from Cou-SH decreased and the quantum yield from the labeled Au²⁵ increased. Second, the authors observed changes in the electrochemical band gap.