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Fluorescent detection of S2- based on ZnMOF-74 and CuMOF-74.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.4 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.saa.2020.118327
Shiqi Wang 1 , Li Wang 1 , Yongmei Zhu 1 , Yonghai Song 1
Affiliation  

The detection of S2- is of great significance because excess S2- can lead to a variety of serious physiological diseases. Here, two metal-organic frameworks (MOFs), ZnMOF-74 and CuMOF-74, were synthesized by using 2,5-dihydroxy terephthalic acid with strong fluorescence as organic ligand and Zn2+ or Cu2+ as central coordination ions for S2- detection. Both as-prepared ZnMOF-74 and CuMOF-74 displayed nanospheres with a diameter of about 100 nm. Under the excitation of 353 nm, the ZnMOF-74 had a characteristic emission peak at 537 nm and the CuMOF-74 had a characteristic emission peak at 528 nm under excitation of 356 nm. The interaction of S2- and Zn2+ weakened the fluorescence of ZnMOF-74 but the interaction of S2- with Cu2+ to form CuS restored the fluorescence of CuMOF-74, so the ZnMOF-74 and CuMOF-74 were exploited as a fluorescent nanosensor for sensing S2-. The ZnMOF-74 sensor has a good linear range of 19.6 nmol L-1-90.0 μmol L-1, and the limit of detection was as low as 6.53 nmol L-1. The CuMOF-74 sensor has a good linear relationship with II0 in the S2- concentration range of 1.50 nmol L-1-125 μmol L-1, and the limit of detection was 1.50 nmol L-1. The proposed ZnMOF-74 and CuMOF-74 sensor could also detect S2- in actual samples.

中文翻译:

基于ZnMOF-74和CuMOF-74的S2-荧光检测。

S2-的检测具有重要意义,因为过量的S2-可导致多种严重的生理疾病。在此,使用具有强荧光的2,5-二羟基对苯二甲酸作为有机配体,并以Zn2 +或Cu2 +作为中心配位离子用于S2-检测,合成了两个金属有机骨架(MOF),即ZnMOF-74和CuMOF-74。制备的ZnMOF-74和CuMOF-74均显示出直径约为100 nm的纳米球。在353nm的激发下,在356nm的激发下,ZnMOF-74在537nm具有特征发射峰,而CuMOF-74在528nm具有特征发射峰。S2-和Zn2 +的相互作用减弱了ZnMOF-74的荧光,但是S2-与Cu2 +形成CuS的相互作用恢复了CuMOF-74的荧光,因此,ZnMOF-74和CuMOF-74被用作检测S2-的荧光纳米传感器。ZnMOF-74传感器具有19.6 nmol L-1-90.0μmolL-1的良好线性范围,并且检测限低至6.53 nmol L-1。CuMOF-74传感器在1.50 nmol L-1-125μmolL-1的S2-浓度范围内与II0具有良好的线性关系,检测极限为1.50 nmol L-1。提议的ZnMOF-74和CuMOF-74传感器还可以检测实际样品中的S2-。
更新日期:2020-04-01
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