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Formation of an emissive telluroxide promoted by Hg2+ in aqueous environment: A new naked-eye and ratiometric rhodamine dimer fluorescent mercury(II) probe
Dyes and Pigments ( IF 4.1 ) Pub Date : 2018-06-14 , DOI: 10.1016/j.dyepig.2018.06.005
Antônio A. Soares-Paulino , Lilian Giroldo , Gizele Celante , Carlos Lodeiro , Alcindo A. Dos Santos

A new chemosensor based on tellurium-rhodamine B (TRB) for the fast and selective detection of Hg2+ in aqueous medium was designed and synthetized in only two steps from a symmetrical organic telluride and rhodamine B. The structure of TRB was determined by RMN, HRMS and IR and its photophysical properties were determined in MeCN/H2O 75:25 v/v. TRB is able to detect Hg2+ in solutions diluted until 1.71 μmol/L and containing until 75% of water in it. In the presence of Hg2+, TRB presents an intense pink color with maximum absorption in 558 nm (log ε = 4.93) and a strong fluorescence emission with maximum intensity in 582 nm (Φ = 0.17). The detection of Hg2+ by TRB occurs by the oxidation of the tellurium promoted by Hg2+, where a redox mechanism was proposed. Even the detection of Hg2+ occurring by the oxidation of tellurium, TRB presented a high selectivity for Hg2+, even when several ROS (H2O2, KNO2, NaOCl, NaONOO e KO2) were submitted to the screening.



中文翻译:

Hg 2+促进在水环境中形成的发光二氧化氮的形成:一种新型的肉眼和比例比的若丹明二聚体荧光汞(II)探针

基于碲-若丹明B(A新化学传感器TRB),用于快速和选择性检测汞2+在水性介质中的设计和从对称碲化有机仅在两个步骤synthetized和罗丹明B的结构TRB由RMN确定在MeCN / H 2 O 75:25 v / v中测定HRMS和IR及其光物理性质。TRB能够检测稀释到1.71μmol/ L的溶液中的Hg 2+,溶液中的水含量达到75%。存在Hg 2+时TRB呈现强烈的粉红色,并在558 nm处具有最大吸收(对数 ε = 4.93)和强烈的荧光发射,最大强度在582 nm(Φ= 0.17)。汞的检测2+通过TRB由汞促进了碲的氧化发生2+,其中提出了一种氧化还原机制。即使通过碲氧化而检测到Hg 2 +TRB仍具有很高的Hg 2+选择性,即使将几种ROS(H 2 O 2,KNO 2,NaOCl,NaONOO e KO 2)提交了筛选。

更新日期:2018-06-14
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