Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry, MOE , Nankai University , Tianjin 300071 , China.
Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province, School of Chemistry & Chemical Engineering , China West Normal University , Nanchong 637002 , China.
Inorg Chem. 2019 May 6;58(9):6356-6362. doi: 10.1021/acs.inorgchem.9b00562. Epub 2019 Apr 15.
A three-dimensional metal-organic framework (MOF) {[Eu(L)(HO)]·DMF} (1) (HL = 2'-nitro-3,4',5-biphenyl tricarboxylic acid) was obtained by hydrothermal methods and was characterized in detail. Compound 1 contains [Eu] binuclear units, and [Eu] units are further linked by HL, forming a three-dimensional structure. Stability tests suggest that compound 1 exhibits high solvent, pH, and thermal stability. Besides, we also explored the influence of pH values in the luminescence emission of 1 which shows that pH has a negligible effect on the luminescence intensity with the range of pH = 3-11. Importantly, luminescent investigations reveal that 1 can selectively detect aspartic acid or histidine among 14 amino acids with good regenerability in water. Meanwhile, the concentration of aspartic acid can be quantitatively determined. We also discuss the mechanism of luminescence quenching and enhancement in detail. Importantly, this Eu-MOF provides a MOF-based luminescence sensor to detect two amino acids for the first time.
一种三维金属有机骨架（MOF）{[Eu(L)(HO)]·DMF}（1）（HL = 2'-硝基-3,4',5-联苯三羧酸）通过水热方法获得，并进行了详细的表征。化合物 1 包含[Eu]双核单元，[Eu]单元通过 HL 进一步连接，形成三维结构。稳定性测试表明，化合物 1 表现出高溶剂、pH 值和热稳定性。此外，我们还研究了 pH 值对 1 的发光发射的影响，结果表明 pH 值在 3-11 的范围内对发光强度几乎没有影响。重要的是，发光研究表明，1 可以在水中选择性地检测 14 种氨基酸中的天冬氨酸或组氨酸，并且具有良好的再生性。同时，可以定量测定天冬氨酸的浓度。我们还详细讨论了发光猝灭和增强的机制。重要的是，这种 Eu-MOF 首次提供了一种基于 MOF 的荧光传感器来检测两种氨基酸。
