一种用于检测汞离子的新型罗丹明功能化席夫碱型比率荧光化学传感器；实验与理论方法
A Novel Rhodamine Functionalized Schiff Base Type Ratiometric Fluorescent Chemosensor for the Sensing of Hg Ions; Experimental and Theoretical Approach.
作者信息
Dash Sushree Suman, Mohanty Patitapaban, Kar Pravin Kumar, Bhaskaran Renjith
机构信息
Department of Chemistry, Veer Surendra Sai University of Technology, Burla, Sambalpur, 768018, Odisha, India.
Department of Chemistry, Madanapalle Institute of Technology & Science, Kadiri Road, Angallu, Madanapalle, 517325, Annamayya District, Andhra Pradesh, India.
出版信息
J Fluoresc. 2025 Jan 30. doi: 10.1007/s10895-024-04132-7.
A new Rhodamine functionalised Schiff Base sensor 3',6'-bis(diethylamino)-2-((4-hydroxybenzylidene)amino)spiro[isoindoline-1,9'-xanthen]-3-one (SBRB1) was designed and synthesized. The recognition ability of sensor SBRB1 towards Hg was studied by using UV-Vis and fluorescence spectroscopy. The fluorescence results showed that the sensor SBRB1 has specific selectivity as well as sensitivity towards Hg among other competitive metal ions as the fluorescence intensity at 479 nm quenched only in the presence of Hg. This sensitivity towards Hg was due to the chelation between ligand and Hg. From the fluorescence titration the binding constant and detection limit of SBRB1:Hg complex were calculated and found to be 5.114 10 M and 2.91 10 M respectively. It showed The 1:1 complexation between SBRB1 and Hg which was conformed from the DFT and TD-DFT study of SBRB1 in both solvent and gas phase.
设计并合成了一种新型的罗丹明功能化席夫碱传感器3',6'-双（二乙氨基）-2-（（4-羟基苄叉基）氨基）螺[异吲哚啉-1,9'-氧杂蒽]-3-酮（SBRB1）。通过紫外可见光谱和荧光光谱研究了传感器SBRB1对汞的识别能力。荧光结果表明，在其他竞争性金属离子中，传感器SBRB1对汞具有特异性选择性和灵敏度，因为仅在汞存在下479 nm处的荧光强度才会猝灭。对汞的这种灵敏度归因于配体与汞之间的螯合作用。通过荧光滴定计算出SBRB1:Hg配合物的结合常数和检测限，分别为5.114×10⁻⁵ M和2.91×10⁻⁸ M。这表明SBRB1与汞之间形成了1:1的络合，这在SBRB1在溶剂和气相中的密度泛函理论（DFT）和含时密度泛函理论（TD-DFT）研究中得到了证实。
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