Highly Selective Fluorescent Recognition towards Th4＋ Based on Coumarin-derivatized Crescent Aromatic Oligoamide  

作　　者：Rongzhao Gao Jinchuan Hu Ke Zhang Youzhou He Peng Liu Shunzhong Luo Yanqiu Yang Liang Yang Wen Feng Lihua Yuan 

机构地区：[1]Key Laboratory for Radiation Physics and Technology of Ministry of Education, College of Chemistry,Institute of Nuclear Science and Technology, Siehuan University, Chengdu, Sichuan 610064, China [2]Institute of Nuclear Physics and Chemistry, CAEP, Mianyang, Sichuan 621900, China

出　　处：《Chinese Journal of Chemistry》2013年第5期689-694,共6页中国化学（英文版）

基　　金：the National Natural Science Foundation of China，NSAF，Sichuan Province Science and Technology Support Programme，the National Fund of China for Fostering Talents in Basic Science，the Open Project of Key Laboratory for Radiation Physics and Technology of Ministry of Education (2010-08).Analytical & Testing Center of Sichuan University is acknowledged for NMR analyses

摘　　要：An intramolecularly hydrogen-bonded crescent aromatic oligoamide 1 bearing two coumarin residues was syn- thesized. 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 sen- sitivity for recognition of Th4＋ over other lanthanide and uranyl ions. A 48-fold fluorescent enhancement in the in- tensity was observed at 505 nm upon adding Th4＋, while other metal cations failed to induce such a significant change. A visual detection for Th4＋ was achieved by color change. The stoichiometry of the complex formed by 1 and Th4＋ was found to be 1 ： 1 with the stability constant of（2.0±0.6） × 10^6 L·mol^-1.An intramolecularly hydrogen-bonded crescent aromatic oligoamide 1 bearing two coumarin residues was syn- thesized. 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 sen- sitivity for recognition of Th4＋ over other lanthanide and uranyl ions. A 48-fold fluorescent enhancement in the in- tensity was observed at 505 nm upon adding Th4＋, while other metal cations failed to induce such a significant change. A visual detection for Th4＋ was achieved by color change. The stoichiometry of the complex formed by 1 and Th4＋ was found to be 1 ： 1 with the stability constant of（2.0±0.6） × 10^6 L·mol^-1.

关 键 词：oligoamide fluorescent recognition THORIUM high selectivity hydrogen bonding 

分 类 号：O626.31[理学—有机化学] TQ241.12[理学—化学]