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A novel Zn(II)-based metal-organic framework as a high selective and sensitive sensor for fluorescent detections of aromatic nitrophenols and antibiotic metronidazole.
Talanta ( IF 5.6 ) Pub Date : 2020-01-13 , DOI: 10.1016/j.talanta.2020.120742
Jing Wang 1 , Qingqing Zha 1 , Guoxu Qin 1 , Yonghong Ni 1
Affiliation  

A novel fluorescent Zn(II)-based metal-organic framework (Zn-MOF), [Zn2(oba)4(4,4'-bpy)2]n, was successfully synthesized through a simple solvothermal route at 130 °C for 48 h, employing Zn(NO3)2·6H2O, 4,4'-Oxybis(benzoic acid) (oba) and 4,4'-Bipyridine (4,4'-bpy) as the initial reactants, dimethylacetamide (DMA) as the reaction medium. The as-obtained Zn-MOF was characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectrum (FTIR), Thermogravimetric analysis (TGA) and elemental analysis. The fluorescence tests showed that the as-obtained Zn-MOF emit a strong violet light centered at 445 nm under the excitation of 323 nm UV light. Intriguingly, the above strong violet emission could be highly selectively quenched by aromatic nitrophenols or antibiotic metronidazole (MET) in aqueous systems with fairly low detection limits. Other substituted phenols and antibiotics, as well as some cations, anions, amino acids and small organic molecules hardly affected the violet emission of the as-obtained Zn-MOF, indicating that this novel Zn-MOF could be prepared as a selective fluorescent probe for detections of aromatic nitrophenols and MET antibiotic in water solutions.

中文翻译:

一种新型的基于锌(II)的金属有机框架,可作为荧光选择性检测芳香族硝基酚和抗生素甲硝唑的高选择性和灵敏性传感器。

通过简单的溶剂热途径在130°C下成功合成了新型的基于荧光Zn(II)的金属-有机骨架(Zn-MOF)[Zn2(oba)4(4,4'-bpy)2] n。 48小时,使用Zn(NO3)2·6H2O,4,4'-氧双(苯甲酸)(oba)和4,4'-联吡啶(4,4'-bpy)作为初始反应物,二甲基乙酰胺(DMA)反应介质。通过X射线粉末衍射(XRD),傅立叶变换红外光谱(FTIR),热重分析(TGA)和元素分析对所得的Zn-MOF进行表征。荧光测试表明,所获得的Zn-MOF在323 nm紫外光的激发下发出了以445 nm为中心的强紫光。有趣的是 在检测限较低的水性体系中,上述强烈的紫色发射可以被芳香族硝基苯酚或抗生素甲硝唑(MET)高度选择性地猝灭。其他取代的苯酚和抗生素,以及一些阳离子,阴离子,氨基酸和有机小分子几乎不影响所获得的Zn-MOF的紫光发射,这表明该新型Zn-MOF可以作为选择性荧光探针制备用于水溶液中芳族硝基苯酚和MET抗生素的检测。
更新日期:2020-01-13
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