Dong Jing, Zhang Xiu-Du, Xie Xia-Fei, Guo Fan, Sun Wei-Yin
Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University Nanjing 210023 China
Nanjing Tech University Nanjing 211816 China.
RSC Adv. 2020 Oct 9;10(61):37449-37455. doi: 10.1039/d0ra06879a. eCollection 2020 Oct 7.
Recently, metal-organic frameworks (MOFs) have been extensively investigated as fluorescence chemsensors due to their tunable porosity, framework structure and photoluminescence properties. In this paper, a well-known Zr(iv)-based MOF, UiO-66-NH was demonstrated to have capability for detection of l-lysine (Lys) and l-arginine (Arg) selectively from common essential amino acids in aqueous media a fluorescence turn-on mechanism. Further investigation reveals its high sensitivity and strong anti-interference properties. Moreover, the possible mechanism for sensing Lys and Arg was explored by FT-IR and H-NMR, and the results indicate that the enhancement of the fluorescence could be ascribed to the adsorption of Lys/Arg and the hydrogen bonding interactions between Lys/Arg and the amino group of UiO-66-NH. The difference of the sensing capacity and sensitivity between UiO-66 and UiO-66-NH revealed that the amino group plays an essential role in the sensing performance. This work presents a unique example of the functional group dependent sensing properties of MOFs.
最近，金属有机框架材料（MOFs）因其可调的孔隙率、框架结构和光致发光特性而被广泛研究用作荧光化学传感器。本文中，一种著名的基于锆（IV）的MOF，UiO-66-NH被证明能够在水介质中从常见的必需氨基酸中选择性地检测L-赖氨酸（Lys）和L-精氨酸（Arg），其荧光开启机制。进一步研究揭示了其高灵敏度和强抗干扰性能。此外，通过傅里叶变换红外光谱（FT-IR）和氢核磁共振（H-NMR）探索了传感Lys和Arg的可能机制，结果表明荧光增强可归因于Lys/Arg的吸附以及Lys/Arg与UiO-66-NH氨基之间的氢键相互作用。UiO-66和UiO-66-NH之间传感能力和灵敏度的差异表明氨基在传感性能中起着至关重要的作用。这项工作展示了MOFs官能团依赖性传感特性的一个独特例子。
