Directional electron transfer in chromophore-labeled quantum-sized Au 25 clusters: Au25 as an electron donor

Mary Sajini Devadas, Kyuju Kwak, Jung Woo Park, Ji Hwan Choi, Chul-Ho Jun, Ekkehard Sinn, Guda Ramakrishna, Dongil Lee

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

Novel Au25(C6S)17PyS clusters (pyrene-functionalized Au25 clusters) showing interesting electrochemical and optical properties are synthesized and characterized. Significant fluorescence quenching is observed for pyrene attached to Au 25 clusters, suggesting strong excited-state interactions. Time-resolved fluorescence upconversion and transient absorption measurements are utilized to understand the excited-state dynamics and possible interfacial electron- and energy-transfer pathways. Electrochemical investigations suggest the possibility of electron transfer from Au25 clusters to the attached pyrene. Fluorescence upconversion measurements have shown faster luminescence decay for the case of pyrene attached to Au25 clusters pointing toward ultrafast photoinduced electron/energy-transfer pathways. Femtosecond transient absorption measurements have revealed the presence of the anion radical of pyrene in the excited-state absorption, suggesting the directional electron transfer from Au25 clusters to pyrene. The rate of forward electron transfer from the Au25 cluster to pyrene is ultrafast (∼580 fs), as observed with femtosecond fluorescence upconversion and transient absorption.

Original languageEnglish
Pages (from-to)1497-1503
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume1
Issue number9
DOIs
Publication statusPublished - 2010 May 6

Fingerprint

Pyrene
pyrenes
Chromophores
chromophores
electron transfer
Electrons
Fluorescence
Excited states
electrons
fluorescence
Energy transfer
energy transfer
excitation
pyrene
Electrochemical properties
Anions
Luminescence
Quenching
Negative ions
Optical properties

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

Cite this

Devadas, Mary Sajini ; Kwak, Kyuju ; Park, Jung Woo ; Choi, Ji Hwan ; Jun, Chul-Ho ; Sinn, Ekkehard ; Ramakrishna, Guda ; Lee, Dongil. / Directional electron transfer in chromophore-labeled quantum-sized Au 25 clusters : Au25 as an electron donor. In: Journal of Physical Chemistry Letters. 2010 ; Vol. 1, No. 9. pp. 1497-1503.
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Directional electron transfer in chromophore-labeled quantum-sized Au 25 clusters : Au25 as an electron donor. / Devadas, Mary Sajini; Kwak, Kyuju; Park, Jung Woo; Choi, Ji Hwan; Jun, Chul-Ho; Sinn, Ekkehard; Ramakrishna, Guda; Lee, Dongil.

In: Journal of Physical Chemistry Letters, Vol. 1, No. 9, 06.05.2010, p. 1497-1503.

Research output: Contribution to journalArticle

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AU - Devadas, Mary Sajini

AU - Kwak, Kyuju

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AU - Choi, Ji Hwan

AU - Jun, Chul-Ho

AU - Sinn, Ekkehard

AU - Ramakrishna, Guda

AU - Lee, Dongil

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