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A highly selective fluorescence-based polymer sensor incorporating an (R,R)-salen moiety for Zn~(2+) detection

机译:一种高度选择性的基于荧光的聚合物传感器,结合了用于锌〜(2+)检测的(R,R)-salen部分

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摘要

A chiral polymer incorporating an (R,R)-salen moiety was synthesized by the polymerization of (R,R)-1,2-diaminocyclohexane with 2,5-dibutoxy-1,4- di(salicyclaldehyde)-1,4-diethynyl-benzene by a nucleophilic additionelimination reaction. The fluorescence responses of the (R,R)-salen-based polymer toward various metal ions were investigated by fluorescence spectra. Compared with other cations, such as Na~+, K~+, Mg~(2+), Ca ~(2+), Mn~(2+), Fe~(2+), Fe~(3+), Co ~(2+), Ni~(2+), Cu~(2+), Ag~+, Cd ~(2+), Hg~(2+), and Pb~(2+), Zn~(2+) can lead to a pronounced fluorescence enhancement as high as 7.8-fold together with an obvious blue-shift change of the chiral polymer. More importantly, the fluorescent color of the polymer changed to bright blue instead of weak yellow after addition of Zn~(2+), which can be easily detected by the naked eye. The results indicate that this kind of chiral polymer, incorporating an (R,R)-salen moiety as a receptor in the main chain backbone, can exhibit high sensitivity and selectivity for Zn~(2+) recognition.
机译:通过(R,R)-1,2-二氨基环己烷与2,5-二丁氧基-1,4-二(水杨醛醛)-1,4-的聚合反应合成了包含(R,R)-salen部分的手性聚合物。二乙炔基苯通过亲核加成消除反应。通过荧光光谱研究了(R,R)-salen-基聚合物对各种金属离子的荧光响应。与其他阳离子相比,如Na〜+,K〜+,Mg〜(2 +),Ca〜(2 +),Mn〜(2 +),Fe〜(2 +),Fe〜(3+), Co〜(2 +),Ni〜(2 +),Cu〜(2 +),Ag〜+,Cd〜(2 +),Hg〜(2+)和Pb〜(2 +),Zn〜( 2+)可以导致高达7.8倍的明显荧光增强以及手性聚合物的明显蓝移变化。更重要的是,加入Zn〜(2+)后,聚合物的荧光颜色变为亮蓝色,而不是微弱的黄色,这可以通过肉眼容易地检测到。结果表明,这种手性聚合物在主链主链中结合了(R,R)-salen部分作为受体,可以表现出对Zn〜(2+)识别的高灵敏度和选择性。

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