Fu Yu-Pei, Yang Hua, Dong Lu-Lu, Wang Fang, Chen Xiao-Li, Wang Ji-Jiang
School of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Laboratory of New Energy & New Function Materials, Yanan University, Yan'an, Shaanxi 716000, China.
School of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Laboratory of New Energy & New Function Materials, Yanan University, Yan'an, Shaanxi 716000, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2024 Feb 15;307:123619. doi: 10.1016/j.saa.2023.123619. Epub 2023 Nov 4.
A novel metal-organic framework (MOF) with the formula of [Cd(CIA)(4,4'-BB)·HO]·HO (Cd-MOF) (HCIA = 5-methoxyisophthalic acid, 4,4'-BB: 4,4'-bis((1H-imidazol-1-yl)methyl)-1,1'-biphenyl) has been designed and synthesized through solvothermal reaction. The structure was characterized by TG, IR, PXRD, elemental analysis, single-crystal X-ray diffraction and XPS. The coordination pattern of the fully deprotonated ligand (CIA) in Cd-MOF is μ-к: к: к. The complex is found to be a three-dimensional reticular material with good thermal stability. Further study revealed that Cd-MOF has good fluorescence performance and can be used as a fluorescent probe for sensitive detection of histidine (His), nitrobenzene (NB), tetracycline (TC) and pyrimethanil (PTH) in water. Four cycles experiments can be achieved with a low detection limit. The detection limits were 0.3 µM (His), 0.05 µM (NB), 0.2 µM (TC) and 0.01 µM (PTH), respectively. To verify the feasibility of detecting PTH in real samples, we further explored it in water samples and apple peels. The spiked recoveries were 95.3-99.4 % and 97.2-101.2 %, respectively. Finally, the fluorescence quenching mechanism of Cd-MOF in His, NB, TC and PTH detection is discussed in detail.
通过溶剂热反应设计并合成了一种新型金属有机框架（MOF），其化学式为[Cd(CIA)(4,4'-BB)·H₂O]·H₂O（Cd-MOF）（H₂CIA = 5-甲氧基间苯二甲酸，4,4'-BB：4,4'-双（（1H-咪唑-1-基）甲基）-1,1'-联苯）。通过热重分析（TG）、红外光谱（IR）、粉末X射线衍射（PXRD）、元素分析、单晶X射线衍射和X射线光电子能谱（XPS）对其结构进行了表征。Cd-MOF中完全去质子化配体（CIA）的配位模式为μ-κ：κ：κ。该配合物是一种具有良好热稳定性的三维网状材料。进一步研究表明，Cd-MOF具有良好的荧光性能，可作为荧光探针用于灵敏检测水中的组氨酸（His）、硝基苯（NB）、四环素（TC）和嘧霉胺（PTH）。四个循环实验可实现低检测限。检测限分别为0.3 μM（His）、0.05 μM（NB）、0.2 μM（TC）和0.01 μM（PTH）。为验证在实际样品中检测PTH的可行性，我们进一步在水样和苹果皮中进行了探索。加标回收率分别为95.3 - 99.4%和97.2 - 101.2%。最后，详细讨论了Cd-MOF在His、NB、TC和PTH检测中的荧光猝灭机制。
