The overuse of antibiotics makes its detection very significant for human health. New facile methods and high‐performance sensory materials will be urgently needed for detection of antibiotics. Unfortunately, there are few reports on fluorescence enhancement of antibiotics detection. Herein, based on the modulability of the coordination mode, we proposed two MOFs with different coordination modes based on different metal ions: Zn‐MOF (1) and Cd‐MOF (2). The fluorescence of 1 and 2 can be efficiently and selectively quenched by nitrofuran antibiotics (nitrofurazone, NFZ and furazolidone, FZD) and chloramphenicol (CAP), respectively. Particularly, the matched energy levels between 2 and enrofloxacin (ENR) enables 2 with turn‐on sensing for ENR. Moreover, apart from the sensitivity and selectivity, 1 and 2 also have strong recyclable ability, fast response time and anti‐interference ability, which make them great potential sensory materials to detect antibiotics.
Phenylglyoxylic acid (PGA), as a urine metabolite of ethylbenzene and styrene (EB/S), can effectively represent the level of EB/S ingested by the human body through oral inhalation and skin absorption. Compared with measuring EB/S levels directly in the environment, detecting the level of PGA in urine has the advantages of high specificity and noninvasive sampling. In this paper, a metal-organic framework (MOF)-based sensor Zn-PBA = ({[Zn(PBA)ÁH 2 O]Á 2H 2 O} n , H 2 PBA = 4-(5-pyridinyl)-1,3 benzoic acid) for trace detection of PGA was designed and synthesized by a solvothermal method. Zn-PBA could detect the level of PGA in normal human physiological urine environment (pH range from 5.5 to 7.5) and has the characteristics of high selectivity and sensitivity, rapid response (<210 s), low limit of detection (LOD = 1.96 Â 10 À6 M), and so forth. The irreversible sensing of PGA proves that PGA caused the structural collapse of Zn-PBA. This paper provides a specific sensor for detecting trace PGA level for evaluating the EB/S content intake by the human body.
Luminescent metal-organic frameworks (LMOFs) as sensors with "turn-on" detecting ability have attracted much attention and remain challenging yet. Herein, two novel LMOFs from homonuclear Mn (II)-MOF (1) to heteronuclear Mn (II)-K(I)-MOF (2) have been synthesized directionally only by alkali regulation. Through the introduction of K(I), heteronuclear 2 exhibits a porous reticulated network with 1D open channels. Both 1 and 2 are highly emissive and show great sensitivity and selectivity, ultrafast response time, and excellent recyclability for "off-on" ascorbic acid sensing. Significantly, the highly permeable channels in 2 allow easy host-guest interaction and contribute to lower detection limit than 1. The controllable assembly of 1 and 2 realizes a novel mode of structure and luminescence tunability, which is crucial for discovering luminescent materials with high-performance for real-time detection applications.
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