Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Apr 5;212:199-205. doi: 10.1016/j.saa.2019.01.009. Epub 2019 Jan 4.
In this work, novel photoluminescent Ag nanoclusters (Ag NCs) with red emission are synthesized and successfully used for detecting iodide ion (I). The dihydrolipoic acid (DHLA) is used as the stabilizing agent and beta-cyclodextrin (β-CD) is used as the auxiliary stabilizing agent. DHLA and β-CD are combined with Ag atoms by the formation of AgS bonds and hydrophobic interaction, respectively. Functionalization of β-CD endows good photoluminescent properties and solubility in water to the Ag NCs. The obtained DHLA and β-CD-protected Ag NCs (DHLA/β-CD-Ag NCs) are spherical and display a dispersed state. However, the DHLA/β-CD-Ag NCs are aggregated in the presence of I, accompanied by the decrease in their fluorescence intensity. Because the integrity of β-CD cavities is retained on the surface of DHLA/β-CD-Ag NCs, which preserves their capability for I host-guest recognition, the DHLA/β-CD-Ag NCs combine with I through the formation of inclusion complexes. Based on this phenomenon, the prepared DHLA/β-CD-Ag NCs can be designed as a novel fluorescent probe for I detection. The limit of detection (LOD) is calculated as 0.06 μM, indicating that it is an ideal probe for I detection in practical applications.
在这项工作中，合成了具有红色发射的新型光致发光 Ag 纳米团簇（Ag NCs），并成功用于检测碘离子（I）。二氢硫辛酸（DHLA）用作稳定剂，β-环糊精（β-CD）用作辅助稳定剂。DHLA 和 β-CD 分别通过形成 AgS 键和疏水相互作用与 Ag 原子结合。β-CD 的功能化赋予了 Ag NCs 良好的发光性能和在水中的溶解性。所得的 DHLA 和 β-CD 保护的 Ag NCs（DHLA/β-CD-Ag NCs）呈球形并呈分散状态。然而，在存在 I 的情况下，DHLA/β-CD-Ag NCs 聚集在一起，伴随着其荧光强度的降低。由于 DHLA/β-CD-Ag NCs 表面上保留了β-CD 空腔的完整性，从而保留了它们与 I 进行主体客体识别的能力，因此 DHLA/β-CD-Ag NCs 通过形成包合物与 I 结合。基于这一现象，制备的 DHLA/β-CD-Ag NCs 可以设计为用于 I 检测的新型荧光探针。检测限（LOD）计算为 0.06 μM，表明其在实际应用中是用于 I 检测的理想探针。
