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Journal of Chemical Sciences

, 130:143 | Cite as

Glutathione-capped gold nanoclusters: photoinduced energy transfer and singlet oxygen generation\(^{\S }\)

  • Christian Talavera
  • Prashant V Kamat
Regular Article

Abstract

Glutathione-capped gold clusters prepared in an aqueous medium are known to exhibit excellent photosensitizing properties. We have now successfully transferred these gold clusters in an organic medium while retaining all the characteristic excited state properties. These gold clusters can be further modified with organic ligands such as 2-Phenylethanethiol (PET). The gold clusters in organic medium exhibit enhanced emission yield (\(\Phi _{\mathrm{f}} = 0.15\)) compared to that in an aqueous medium (\(\Phi _{\mathrm{f}} = 0.08\)). The excited state lifetimes of \(3.7\,\upmu \hbox {s}\) (untreated) and \(1.5\,\upmu \hbox {s}\) (PET treated) in toluene are also greater than the lifetime observed in aqueous solution (\(0.77\,\upmu \hbox {s}\)). By employing laser flash photolysis we are able to induce triplet energy transfer to \(\upbeta \)-carotene and oxygen. A singlet oxygen generation with the efficiency of 13% was observed in these experiments. The excited state properties of glutathione-capped gold clusters further shows its importance as a photosensitizer in light energy conversion and biomedical applications

Graphical Abstract

SYNOPSIS A few atom gold clusters modified with organic ligands exhibit high photoactivity by generating singlet oxygen with 13% quantum efficiency.

Keywords

Gold clusters singlet oxygen excited state transient absorption specroscopy energy transfer photosensitizer 

Notes

Acknowledgements

The research work described here was supported by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy, through award DE-FC02-04ER15533. This is contribution number NDRL No. 5218 from the Notre Dame Radiation Laboratory.

Supplementary material

12039_2018_1549_MOESM1_ESM.pdf (825 kb)
Supplementary material 1 (pdf 824 KB)

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Radiation Laboratory, Department of Chemistry and BiochemistryUniversity of Notre DameNotre DameUSA

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