Madathumpady Abubaker Habeeb , Muhammed and R V, Omkumar (2009) Bright, NIR‐Emitting Au23 from Au25: Characterization and Applications Including Biolabeling. Chemistry A European Journal, 15. 10110 -10120. ISSN 1521-3765

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Abstract

A novel interfacial route has been developed for the synthesis of a bright‐red‐emitting new subnanocluster, Au23, by the core etching of a widely explored and more stable cluster, Au25SG18 (in which SG is glutathione thiolate). A slight modification of this procedure results in the formation of two other known subnanoclusters, Au22 and Au33. Whereas Au22 and Au23 are water soluble and brightly fluorescent with quantum yields of 2.5 and 1.3 %, respectively, Au33 is organic soluble and less fluorescent, with a quantum yield of 0.1 %. Au23 exhibits quenching of fluorescence selectively in the presence of Cu2+ ions and it can therefore be used as a metal‐ion sensor. Aqueous‐ to organic‐phase transfer of Au23 has been carried out with fluorescence enhancement. Solvent dependency on the fluorescence of Au23 before and after phase transfer has been studied extensively and the quantum yield of the cluster varies with the solvent used. The temperature response of Au23 emission has been demonstrated. The inherent fluorescence of Au23 was used for imaging human hepatoma cells by employing the avidin–biotin interaction.

Item Type:	Article
Uncontrolled Keywords:	core etching · fluores- cence · gold · nanostructures · phase transfer
Subjects:	Molecular Neurobiology
Depositing User:	Central Library RGCB
Date Deposited:	25 Sep 2019 07:11
Last Modified:	25 Sep 2019 07:11
URI:	http://rgcb.sciencecentral.in/id/eprint/879

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