Photoproduced Fluorescent Au(I)@(Ag2/Ag3)-Thiolate Giant Cluster: An Intriguing Sensing Platform for DMSO and Pb(II)
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- 作者：Mainak Ganguly ; Chanchal Mondal ; Jayasmita Jana ; Anjali Pal ; Tarasankar Pal
- 刊名：Langmuir
- 出版年：2014
- 出版时间：January 14, 2014
- 年：2014
- 卷：30
- 期：1
- 页码：348-357
- 全文大小：800K
- ISSN：1520-5827
文摘
Synergistic evolution of fluorescent Au(I)@(Ag2/Ag3)-thiolate core鈥搒hell particles has been made possible under the Sun in presence of the respective precursor coinage metal compounds and glutathione (GSH). The green chemically synthesized fluorescent clusters are giant (600 nm) in size and robust. Among all the common water miscible solvents, exclusively DMSO exhibits selective fluorescence quenching (Turn Off) because of the removal of GSH from the giant cluster. Again, only Pb(II) ion brings back the lost fluorescence (Turn On) leaving aside all other metal ions. This happens owing to the strong affinity of the sulfur donor of DMSO for Pb(II). Thus, employing the aqueous solution containing the giant cluster, we can detect DMSO contamination in water bodies at trace level. Besides, a selective sensing platform has emerged out for Pb(II) ion with a detection limit of 14 脳 10鈥? M. Pb(II) induced fluorescence recovery is again vanished by I鈥?/sup> implying a promising route to sense I鈥?/sup> ion.