Highly Selective Fluorescent Recognition towards Th 4+ Based on Coumarin‐derivatized Crescent Aromatic Oligoamide

An intramolecularly hydrogen‐bonded crescent aromatic oligoamide 1 bearing two coumarin residues was synthesized. The results from UV‐vis and fluorescent spectra upon metal ions complexation demonstrated that the two fluorophores serving as parts of the shape‐persistent backbone provided the molecul...

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Bibliographic Details
Published in:Chinese journal of chemistry 2013-05, Vol.31 (5), p.689-694
Main Authors: Gao, Rongzhao, Hu, Jinchuan, Zhang, Ke, He, Youzhou, Liu, Peng, Luo, Shunzhong, Yang, Yanqiu, Yang, Liang, Feng, Wen, Yuan, Lihua
Format: Article
Language:English
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Summary:An intramolecularly hydrogen‐bonded crescent aromatic oligoamide 1 bearing two coumarin residues was synthesized. The results from UV‐vis and fluorescent spectra upon metal ions complexation demonstrated that the two fluorophores serving as parts of the shape‐persistent backbone provided the molecule with high selectivity and sensitivity for recognition of Th 4+ over other lanthanide and uranyl ions. A 48‐fold fluorescent enhancement in the intensity was observed at 505 nm upon adding Th 4+ , while other metal cations failed to induce such a significant change. A visual detection for Th 4+ was achieved by color change. The stoichiometry of the complex formed by 1 and Th 4+ was found to be 1:1 with the stability constant of (2.0±0.6)×10 6 L·mol −1 .
ISSN:1001-604X
1614-7065
DOI:10.1002/cjoc.201300359