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首页> 外文期刊>RSC Advances >Facile construction of a hyperbranched poly(acrylamide) bearing tetraphenylethene units: a novel fluorescence probe with a highly selective and sensitive response to Zn2+
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Facile construction of a hyperbranched poly(acrylamide) bearing tetraphenylethene units: a novel fluorescence probe with a highly selective and sensitive response to Zn2+

机译：带有四苯乙烯单元的超支化聚丙烯酰胺的简便构建：一种新型荧光探针，对Zn2 +具有高度选择性和敏感性

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摘要

Thermo-responsive hyperbranched copoly(bis( N , N -ethyl acrylamide)/( N , N -methylene bisacrylamide)) (HPEAM-MBA) was synthesized by using reversible addition–fragmentation chain-transfer polymerization (RAFT). Interestingly, the zinc ion (Zn ~(2+) ) was found to have a crucial influence on the lowest critical solution temperature (LCST) of the thermo-responsive polymer. The tetraphenylethylene (TPE) unit was then introduced onto the backbone of the as-prepared thermo-responsive polymer, which endows a Zn ~(2+) -responsive “turn-off” effect on the fluorescence properties. The TPE-bearing polymer shows a highly specific response over other metal ions and the “turn-off” response can even be tracked as the concentration of Zn ~(2+) reduces to 2 × 10 ~(?5) M. The decrement of fluorescence intensity was linearly dependent on the concentration of Zn ~(2+) in the range of 4–18 μmol L ~(?1) . The flexible, versatile and feasible approach, as well as the excellent detection performance, may generate a new type of Zn ~(2+) probe without the tedious synthesis of the moiety bearing Zn ~(2+) recognition units.
机译：利用可逆加成-断裂链转移聚合（RAFT）合成了热响应性超支化共聚（双（N，N-乙基丙烯酰胺）/（N，N-亚甲基双丙烯酰胺））（HPEAM-MBA）。有趣的是，发现锌离子（Zn〜（2+））对热敏性聚合物的最低临界溶液温度（LCST）具有至关重要的影响。然后将四苯基乙烯（TPE）单元引入到所制备的热敏聚合物的骨架上，该聚合物对荧光性质具有Zn〜（2+）响应“关闭”效应。含TPE的聚合物显示出比其他金属离子更高的特异性响应，甚至可以在Zn〜（2+）的浓度降低至2×10〜（？5）M时跟踪“关闭”响应。 Zn〜（2+）的浓度在4–18μmolL〜（？1）范围内呈线性关系。灵活，通用和可行的方法以及出色的检测性能可以生成一种新型的Zn〜（2+）探针，而无需繁琐地合成带有Zn〜（2+）识别单元的部分。

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