title: New highly selective turn-on fluorescence receptor for the detection of copper (II).
abstract: Three new receptors (1a-c) bearing a p-dimethylaminobenzamide fluorophore have been synthesized and evaluated in terms of their fluoroionophoric properties towards various metal ions. Notably, receptors 1a and 1c exhibited dramatic fluorescent enhancement towards Cu2+in acetonitrile. Subsequent investigations revealed that the highly selective behavior of these receptors towards Cu2+could be attributed to the Cu2+-mediated oxidative cyclization of these compounds to the corresponding 1,3,4-oxadiazoles. Solvent effects and quantum calculations indicated that 1a and 1c both possessed an intramolecular charge transfer channel, which could be obstructed by the oxidative cyclization of these receptors. Receptor 1a was successfully applied to the determination of the Cu2+in drug sample with a low detection limit of 2.2×10-8molL-1.
authors.affiliation: Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Nan
authors.affiliation: Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Pu
authors.initials: P
authors.lastname: Rong
authors.affiliation: Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China; The MOE Key Laboratory of Analytical Sciences, Xiamen University, Xiamen 361005, China.
authors.forename: Yunbao
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China. Electronic address: ruiyang@swu.edu.cn.
authors.forename: Rui
authors.initials: R
authors.lastname: Yang
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D002021:Buffers; D003300:Copper / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry*; D008958:Models, Molecular; D011789:Quantum Theory; D012997:Solvents; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry
chemical_list: D000097:Acetonitriles; D002021:Buffers; D005456:Fluorescent Dyes; D012997:Solvents; D014867:Water; D003300:Copper; C032159:acetonitrile
keywords: Copper (II); Fluorescence receptor; Intramolecular charge transfer; Oxidative cyclization