标题：New fluorescent chemosensor based on quinoline and coumarine for Cu~(2+)
作者：Zhen-Ju Jiang;Hong-Shui Lv;Jian Zhu
作者机构：[Jiang, Z.-J] School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;[ Lv, H.-S] School of Chemistry and Chemical Engi 更多
通讯作者地址：[Zhao, BX]Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China.
关键词：Fluorescent chemosensor;Copper ion;Coumarin;8-Hydroxyquinoline
摘要：A new fluorescent chemosensor based a coumarin fluorophore and an 8-hydroxyquinoline ionophore was synthesized and characterized by ~1H NMR, IR and ESI-HRMS. Its selectivity toward metal ions in ace-tonitrile (1% water, v/v) was investigated by UV absorption and fluorescence spectroscopy. The results showed that this chemosensor exhibited good selectivity toward Cu~(2+) over other metal ions by enhancement of fluorescence intensity more than 13-fold, and the fluorescent color change could be observed by naked eyes under the light of 365 nm. The absorption spectra of the sensor (L) toward the concentration of Cu~(2+) indicated the formation of L-Cu~(2+) complex, and the complex was 1:1 ratio according to Job plot experiment. Both of photo-induced electron transfer (PET) and intramolecular charge transfer (ICT) mechanisms were considered to be operational for fluorescence enhancement and spectral shift. The detection limit of Cu~(2+)was determined to be 1.16 μM, a satisfying level to detect Cu~(2+) in micromolar scale.