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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Structural modification of rhodamine-based sensors toward highly selective mercury detection in mixed organic/aqueous media
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Structural modification of rhodamine-based sensors toward highly selective mercury detection in mixed organic/aqueous media

机译:罗丹明基传感器的结构改进,使其能够在混合的有机/水性介质中进行高度选择性的汞检测

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In virtue of the sulfurphilic nature of Hg~ (2+), three new sensors RN1, RN2 and RST1 that combine a thiophene group and one or two rhodamine choromophores, or a thiospirolactam rhodamine chromophore, were designed and prepared for the selective detection of Hg~ (2+) in aqueous media, respectively. These sensors all displayed good brightness and fluorescence enhancement following Hg~ (2+) coordination with limits of detection for Hg~ (2+) at the ppb level. Thus, they have the potential for distinguishing between safe and toxic levels of inorganic mercury in drinking water. RN1 exhibited chromogenic and fluorogenic selectivity over alkali, alkaline earth metals, divalent first-row transition metal ions as well as heavy metals, but the presence of Cu~ (2+) had a small but significant influence on the absorption detection of Hg~ (2+). Compared to RN1, the introduction of sufficient sulfur atoms could increase the binding capability of RST1 towards Hg~ (2+) relative to the sensor RN1, but decrease its Hg specific ability. The existence of some heavy and transition metal ions, such as Pb~ (2+), Ag~ +, Cu~ (2+) enhance the silent absorption spectra of RST1. Spectral evidence and X-ray structural investigations of the mercury complex revealed a possible 1:2 complexation behaviour between the Hg~ (2+) ion and the sensor RN1 or RST1. Sensor RN2 which contains two rhodamine carboxhydrazone arms exhibited better selectivity, compared to those of RN1 and RST1. The addition of Cu~ (2+) only caused a small interference for the absorption detection of Hg~ (2+) under the same conditions, demonstrating the efficiency of the robust bis-chelating mode with regard to the selectivity for Hg~ (2+).
机译:根据Hg〜(2+)的亲硫性质,设计并准备了三个新的传感器RN1,RN2和RST1,它们结合了噻吩基团和一个或两个若丹明发色团,或硫代螺内酰胺若丹明发色团,用于选择性检测Hg在水性介质中分别为〜(2+)。这些传感器在Hg〜(2+)配合下以及ppb级别的Hg〜(2+)检出限后均显示出良好的亮度和荧光增强。因此,它们有可能区分饮用水中无机汞的安全和有毒水平。 RN1对碱金属,碱土金属,二价第一行过渡金属离子以及重金属具有显色和荧光选择性,但是Cu〜(2+)的存在对Hg〜( 2+)。与RN1相比,引入足够的硫原子可以提高RST1相对于传感器RN1与Hg〜(2+)的结合能力,但会降低其Hg的比能力。 Pb〜(2 +),Ag〜+,Cu〜(2+)等重金属和过渡金属离子的存在增强了RST1的无声吸收光谱。汞络合物的光谱证据和X射线结构研究表明,Hg〜(2+)离子与传感器RN1或RST1之间可能存在1:2的络合行为。与RN1和RST1相比,包含两个若丹明羧甲基arms臂的RN2传感器具有更好的选择性。 Cu〜(2+)的添加仅对相同条件下的Hg〜(2+)的吸收检测产生很小的干扰,证明了稳健的双螯合模式在Hg〜(2)选择性方面的效率。 +)。

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