Conventional luminescent sensors relying on single emission responsive to analytes demonstrate limited sensitivity and selectivity and developing novel self‐calibration probes is highly required. A series of water‐stable coordination polymers (CPs) with three emitting centers for tunable emissions is reported. They are facilely synthesized by simultaneously doping red‐emitting Eu3+ and green‐emitting Tb3+ into the same framework. The versatile Eu0.67Tb0.33–CP is applied to conveniently distinguishing different nitroaromatics pollutants and multidimensional ratiometric sensing CrO42−/Cr2O72−. Specific nitroaromatics can cause unique changes to the ligand→Eu3+/Tb3+ energy transfer efficiency, while CrO42−/Cr2O72− intriguingly quench the three emissions at different rates. Each nitroaromatic exhibits notably correlation to a unique combination of the two ligand→Eu3+/Tb3+ emission intensity ratios, enabling a 2D fingerprint recognition. Furthermore, the concentration‐dependent evolution of the two ratios upon exposure to CrO42−/Cr2O72− can be mapped out, achieving a 3D code recognition. As a result, the sensor demonstrates selective recognition of 4‐nitrophenol and CrO42−/Cr2O72− with high sensitivity and selectivity as well as great recycling ability. Both the synthetic and sensing strategies present a promising strategy to develop facile and effective ratiometric sensors.
Dipicolinate acid (DPA) is an anthrax biomarker. It's serious consequences make it's detection in great need. In this paper, three novel metal-organic frameworks (MOFs) with different coordination modes were synthesized...
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.
Sensitive luminescent probes for phenylglyoxylic acid (PGA), which is a biomarker of ethylbenzene and styrene (EB/S) representing the internal dose of EB/S exposure, have been constructed on the basis of newly designed luminescent coordination polymers (LCPs). Three isostructural LCPs with different lanthanide centers were solvothermally synthesized and fully characterized. All the LCPs 1-3 display strong regulated emissions by the adjustable metalorganic coordination interactions. Among LCPs 1-3, the fabricated LCP 2 can quantitatively detect PGA with the highest sensitivity in physiologically relevant ranges. The mechanism study of luminescent responses toward PGA further explains the excellent sensitivity and selectivity of LCP 2 for sensing PGA. The facile, accurate, fast, and recyclable sensing system relying on LCP materials provides a convenient approach for developing sensing platforms with adjustable emissions for assessment of the intoxication level of EB/S.
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