基于带有2,6-二（4-羧苯基）吡嗪的发光配位聚合物的高效荧光化学传感器，用于硝基抗生素检测,CrystEngComm

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基于带有2,6-二（4-羧苯基）吡嗪的发光配位聚合物的高效荧光化学传感器，用于硝基抗生素检测
CrystEngComm ( IF 2.6 ) Pub Date : 2021-3-25 , DOI: 10.1039/d1ce00245g
Shuang-Li Sun _{1,

2,

3,

4} , Xi-Yu Sun _{1,

2,

3,

4} , Qian Sun _{1,

2,

3,

4} , En-Qing Gao _{2,

4,

5,

6,

7}

Affiliation

作为全球关注的关键问题，抗生素的过度使用对生态环境和人类健康构成了重大威胁。在这里，三种同构结构的配位聚合物{{M（DCPP）（H ₂ O）]·（DMF）} _n [M = Zn（1），Mn（2）和Co（3）; 用溶剂热法合成DCPP ＝ 2，6-二（羧苯基）吡嗪），并对其进行了充分表征。该系列配合物具有二维双层结构，并且这些层通过氢键相互作用彼此平行地堆叠成多孔的超分子框架。通道中存在的未配位DMF分子参与氢键连接并稳定3D超分子骨架。结果，配位聚合物具有良好的热稳定性以及优异的水和有机溶剂耐受性。氮原子充当通道中的Lewis碱基，促进1通过荧光猝灭效应来锚定并识别硝基抗生素，包括硝基呋喃（NFT和NFZ），硝基咪唑（ONZ和MNZ）。硝基抗生素的选择性反应很快，检出限也很低。对传感机理的系统分析表明，光致电子转移和荧光内滤效应的协同作用使配合物1表现出对硝基抗生素的特殊识别。新的MOF材料的有效识别能力可确保将来有希望的应用。

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Highly efficient fluorescent chemosensor for nitro antibiotic detection based on luminescent coordination polymers with 2,6-di(4-carboxyphenyl)pyrazine

As a critical issue of global concern, antibiotic overuse poses a significant threat to the eco-environment and human health. Here, three isostructural coordination polymers with the formula {[M(DCPP)(H₂O)]·(DMF)}_n [M = Zn (1), Mn (2) and Co (3); DCPP = 2,6-di(carboxyphenyl)pyrazine)] were synthesized with a solvothermal method and fully characterized. The series of complexes feature 2D bilayer structures, and the layers are stacked parallel to each other into porous supramolecular frameworks through hydrogen bonding interactions. The uncoordinated DMF molecules that exist in the channel participate in hydrogen bonding and stabilize the 3D supramolecular skeleton. As a result, the coordination polymers have good thermal stability and excellent water and organic solvent tolerance. The nitrogen atom serves as Lewis-base sites in the channel, facilitating 1 to anchor and recognize nitro antibiotics, including nitrofurans (NFT and NFZ), nitroimidazoles (ONZ and MNZ) through the fluorescence quenching effect. The nitro antibiotic selective response is quick, and detection limits are reasonably low. Systematic analysis of the sensing mechanism reveals that the cooperative influence of photoinduced electron transfer and fluorescence inner filter effect made complex 1 exhibit special recognition of nitro antibiotics. The efficient identification ability of the new MOF material ensures a promising application in the future.

更新日期：2021-04-13

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