硝基苯
荧光
金属有机骨架
锌
水溶液中的金属离子
化学
镉
羧酸盐
检出限
光诱导电子转移
猝灭(荧光)
金属
密度泛函理论
无机化学
电子转移
材料科学
光化学
物理化学
吸附
有机化学
色谱法
催化作用
计算化学
物理
量子力学
作者
Yanan Pan,Jundong Wang,Xiaokui Guo,Xiaoyan Liu,Xiaoliang Tang,Haixia Zhang
标识
DOI:10.1016/j.jcis.2017.11.034
摘要
In this study, a novel three-dimensional zinc-based metal-organic framework (Zn-MOF), i.e., {Zn2(L)2(DMF)2H2O}n (L = 2,5-bis(phenylamino)-1,4-benzenedicarboxylic acid) was designed and developed under solvothermal condition. As a proof-of-principle, a π-conjugated framework of carboxylate ligand capable of "bottom up" synthesis was integrated with metal ion to construct a novel MOF for sensing applications. As expected, the synthesized Zn-MOF exhibited fluorescence enhancement for cadmium ion (Cd2+) and sensing of nitrobenzene (NB) through fluorescence quenching. The detection limits were calculated to be 0.12 μM for Cd2+ and 1.19 μg mL-1 for NB based on signal-to-noise ratio of 3:1. Moreover, various techniques and density functional theory investigations verified that the possible sensing mechanisms for Cd2+ and NB included ion exchange and photoinduced electron transfer, respectively. Finally, their practical applications on real samples also demonstrated that the Zn-MOF-based sensor can be effectively utilized for detection and imaging of Cd2+ present in the real water samples and living cells. This study may inspire future research and design of target fluorescent MOFs with specific functions.
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