Department of Chemistry, Indian Institute of Technology , Kharagpur-721302, West Bengal, India.
Langmuir. 2014 Jan 14;30(1):348-57. doi: 10.1021/la403848z. Epub 2014 Jan 3.
Synergistic evolution of fluorescent Au(I)@(Ag2/Ag3)-thiolate core-shell 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 × 10(-8) M. Pb(II) induced fluorescence recovery is again vanished by I(-) implying a promising route to sense I(-) ion.
在太阳的照射下，在相应的前体金属化合物和谷胱甘肽 (GSH) 的存在下，荧光金 (I)@(Ag2/Ag3)-硫醇核壳粒子实现了协同进化。绿色化学合成的荧光团簇尺寸巨大（约 600nm）且稳定。在所有常见的水溶性溶剂中，只有 DMSO 由于从巨大的簇中去除了 GSH，表现出选择性荧光猝灭（关闭）。同样，只有 Pb(II) 离子能恢复失去的荧光（打开），而忽略了所有其他金属离子。这是由于 DMSO 的硫供体对 Pb(II) 的强亲和力所致。因此，我们可以使用含有该巨大簇的水溶液在痕量水平检测水体中的 DMSO 污染。此外，一个用于 Pb(II) 离子的选择性传感平台已经出现，检测限为 14×10(-8) M。Pb(II) 诱导的荧光恢复再次被 I(-) 消除，这为感应 I(-) 离子提供了一个很有前途的途径。
