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

Published online by Cambridge University Press:  27 August 2019

Angela Meola ,
Nicole Hondrogiannis ,
Pierce Brown ,
Maksym Zhukovskyi ,
Zheng Zheng ,
Zeev Rosenzweig ,
Keith Reber  and
Mary Sajini Devadas
Angela Meola
Affiliation:
Department of Chemistry, Towson University, Towson, MD 21252, USA
Nicole Hondrogiannis
Affiliation:
Department of Chemistry, Towson University, Towson, MD 21252, USA
Pierce Brown
Affiliation:
Department of Chemistry, Towson University, Towson, MD 21252, USA
Maksym Zhukovskyi
Affiliation:
Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA
Zheng Zheng
Affiliation:
Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, MD 21250, USA
Zeev Rosenzweig
Affiliation:
Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, MD 21250, USA
Keith Reber
Affiliation:
Department of Chemistry, Towson University, Towson, MD 21252, USA
Mary Sajini Devadas*
Affiliation:
Department of Chemistry, Towson University, Towson, MD 21252, USA
*
Address all correspondence to Mary Sajini Devadas at [email protected]
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Abstract

${\rm Au}_{25}\lpar {{\rm C}_6{\rm H}_{14}{\rm S}} \rpar_{18}{}^-$ 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.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 3 , September 2019 , pp. 992 - 1000
Copyright
Copyright © The Author(s) 2019 

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Footnotes

†

These authors contributed equally to this work.

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