材料科学
镧系元素
污染物
发光
选择性
配体(生物化学)
聚合物
兴奋剂
灵敏度(控制系统)
发射强度
光化学
光电子学
复合材料
催化作用
有机化学
离子
化学
工程类
电子工程
受体
生物化学
作者
Enjun Gao,Shuangyan Wu,Jing Wang,Mingchang Zhu,Ying Zhang,Vladimir P. Fedin
标识
DOI:10.1002/adom.201901659
摘要
Abstract 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 Eu 3+ and green‐emitting Tb 3+ into the same framework. The versatile Eu 0.67 Tb 0.33 –CP is applied to conveniently distinguishing different nitroaromatics pollutants and multidimensional ratiometric sensing CrO 4 2− /Cr 2 O 7 2− . Specific nitroaromatics can cause unique changes to the ligand→Eu 3+ /Tb 3+ energy transfer efficiency, while CrO 4 2− /Cr 2 O 7 2− intriguingly quench the three emissions at different rates. Each nitroaromatic exhibits notably correlation to a unique combination of the two ligand→Eu 3+ /Tb 3+ emission intensity ratios, enabling a 2D fingerprint recognition. Furthermore, the concentration‐dependent evolution of the two ratios upon exposure to CrO 4 2− /Cr 2 O 7 2− can be mapped out, achieving a 3D code recognition. As a result, the sensor demonstrates selective recognition of 4‐nitrophenol and CrO 4 2− /Cr 2 O 7 2− 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.
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