New fluorescent chemosensor based on quinoline and coumarine for Cu2+

作者：Jiang Zhen Ju; Lv Hong Shui; Zhu Jian; Zhao Bao Xiang^*

来源：Synthetic Metals, 2012, 162(23): 2112-2116.

DOI：10.1016/j.synthmet.2012.09.013

• Fluorescent chemosensor
• Copper ion
• Coumarin
• 8-Hydroxyquinoline

A new fluorescent chemosensor based a coumarin fluorophore and an 8-hydroxyquinoline ionophore was synthesized and characterized by H-1 NMR, IR and ESI-HRMS. Its selectivity toward metal ions in acetonitrile (1% water, v/v) was investigated by UV absorption and fluorescence spectroscopy. The results showed that this chemosensor exhibited good selectivity toward Cu2+ 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 Cu2+ indicated the formation of L-Cu2+ 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 Cu2+ was determined to be 1.16 mu M, a satisfying level to detect Cu2+ in micromolar scale.

• 出版日期2012-12
• 单位山东大学