荧光
锌
检出限
分析化学(期刊)
三吡啶
化学
离子
轨道能级差
水溶液中的金属离子
光致发光
金属
分子
材料科学
物理
色谱法
有机化学
光电子学
量子力学
作者
B. B. Pavankumar,Prabodh Ranjan,Rakesh R. Panicker,Prakash C. Jha,C.V.S. Brahmananda Rao,Rajagopal Desikan,Akella Sivaramakrishna
标识
DOI:10.1002/slct.202304509
摘要
Abstract The present work demonstrates the determination of thorium ( Th 4+ ), zinc ( Zn 2+ ) and fluoride ( F − ) ions by employing a substituted tripodal terpyridine ( TP ) as a fluorescence sensor. The distinct fluorescence intensities of the free TP and TP ‐M complexes (M= Zn 2+ or Th 4+ ) with the same emission wavelength at 468 nm were observed in steady‐state photoluminescence (PL) spectra at pH 7.0 with a 1 : 3 ratio of metal to the ligand. A ratiometric dual fluorescence signals for Zn 2+ and Th 4+ were displayed by the probe TP at varied concentrations. Furthermore, the quantitative determination of F − ions was achieved through the addition of F − to the tripod‐terpyridine‐zinc complex ( TP‐Zn 2+ ) where the fluorescence intensity decreases gradually. Notably, the present work facilitates the LOD (limit of detection) as 1.1×10 −10 M, 1.01×10 −8 M and 3.18×10 −10 M and further LOQ (limit of quantification) as 0.37×10 −9 M, 0.33×10 −7 M and 5.26×10 −9 M for Zn 2+ , Th 4+ and F − ions, respectively. The predicted absorption spectra of TP show HOMO to LUMO+2 electronic excitation at 358 nm whereas the complex TP‐Th 4+ exhibits HOMO to LUMO+1 electronic excitation at 568 nm.
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