Electronic Synergy between Ligands of Luminol and Isophthalic Acid for Fluorescence Ratiometric Detection of Hg2+,Analytica Chimica Acta

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Electronic Synergy between Ligands of Luminol and Isophthalic Acid for Fluorescence Ratiometric Detection of Hg2+
Analytica Chimica Acta ( IF 5.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.aca.2020.06.047
Yuan-Jun Tong ₁ , Jia-Xin Qi ₁ , An-Min Song ₁ , Xiao-Li Zhong ₁ , Wei Jiang ₁ , Li Zhang ₁ , Ru-Ping Liang ₁ , Jian-Ding Qiu ₂

Affiliation

Stimulus-responsive double-ligand luminol-Eu-IPA infinite coordination polymer nanoparticles (luminol-Eu-IPA CPNPs) were prepared as a ratiometric fluorescence probe for highly selective detecting Hg2+. The CPNPs were constituted of Eu3+ as the nuclear metal coordinated by isophthalic acid (IPA) together with luminol as an auxiliary ligand. The photoinduced electron transfer (PET) occurring from IPA to luminol prevented the antenna effect between IPA and Eu3+, leading to the quench fluorescence of Eu3+ under light excitation. As Hg2+ has a high affinity to N atom of luminol and the spin-orbit coupling effect, spectroscopically and magnetically silent properties, the fluorescence intensity of luminol was quenched. Meanwhile, the PET effect between luminol and IPA was interrupted under the presence of Hg2+. This process resulted in a significant decrease in the fluorescence intensity of luminol and a significant increase in the fluorescence intensity of Eu3+. Therefore, the fluorescence ratiometric detection of Hg2+ was performed by monitoring the ratio of the fluorescence at 617 nm of Eu3+ to that at 430 nm of luminol. The linear range was from 0.05 to 20 μM with a detection limit as low as 13.2 nM Hg2+ (S/N = 3). Due to the fluorescence of luminol be quenched and the effect of PET be disrupted simultaneously, the probe exhibiting excellent detection selectively can avoid false positive signals, which was demonstrated for monitoring mercury ions in real water samples. Precision in positioning ligands in CPNPs is an advantage to achieve high specificity in comparison to traditional organic dendrimers or precious metal nanomaterials.

中文翻译：

鲁米诺和间苯二甲酸配体之间的电子协同作用用于 Hg2+ 的荧光比率检测

制备了刺激响应双配体鲁米诺-Eu-IPA 无限配位聚合物纳米粒子（鲁米诺-Eu-IPA CPNPs）作为比例荧光探针，用于高选择性检测 Hg2+。CPNPs 由作为核金属的 Eu3+ 与间苯二甲酸 (IPA) 配位以及作为辅助配体的鲁米诺组成。从 IPA 到鲁米诺的光诱导电子转移 (PET) 阻止了 IPA 和 Eu3+ 之间的天线效应，导致 Eu3+ 在光激发下猝灭荧光。由于Hg2+对鲁米诺的N原子具有高亲和力和自旋轨道耦合效应，光谱和磁静特性，鲁米诺的荧光强度被猝灭。同时，鲁米诺和 IPA 之间的 PET 效应在 Hg2+ 的存在下被中断。这一过程导致鲁米诺荧光强度显着降低，Eu3+荧光强度显着增加。因此，Hg2+ 的荧光比率检测是通过监测 Eu3+ 在 617 nm 处的荧光与鲁米诺在 430 nm 处的荧光比率来进行的。线性范围为 0.05 至 20 μM，检测限低至 13.2 nM Hg2+ (S/N = 3)。由于鲁米诺的荧光被猝灭和PET的作用同时被破坏，表现出优异检测选择性的探针可以避免假阳性信号，这在监测真实水样中的汞离子时得到证明。与传统的有机树枝状聚合物或贵金属纳米材料相比，在 CPNP 中精确定位配体是实现高特异性的优势。

更新日期：2020-09-01

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