A novel selective chemosensor for Mg2+ detection based on quinoline-hydrazone-crown ether

作者：Ma, Ruifang; Li, Qiaohong; Zhang, Qiang^*

来源：Indian Journal of Chemistry - Section B: Organic and Medicinal Chemistry , 2018, 57(1): 120-126.

• Quinoline-hydrazone-crown ether
• synthesis
• alkali and alkaline-earth cations
• Mg2+
• chemosensor

A novel Mg2+-selective chemosensor based on quinoline-hydrazone-crown ether (L1) has been synthesized and characterized by H-1 NMR, elemental analysis and ESI-mass spectrometry. The absorption and emission spectra of L1 have been investigated in the presence of alkali and alkaline-earth cations (Li+, Na+, K+, Mg2+, Ca2+, Sr2+ and Ba2+). Mg2+ results in an instant color change of L1 from colorless to yellow in ethanol. Upon binding of Mg2+, a significant fluorescence enhancement is triggered in acetonitrile. Thus, L1 is expected to be used as an interesting Mg2+ sensitive chemosensor. The 1:1 stoichiometry binding mode of L1 with Mg2+ is supported by the Benesi-Hildebrand analysis. The binding constants (1gK) in ethanol and acetonitrile are found to be 4.54 and 3.57 by the goodness of the linear fitting of the Benesi-Hildebrand plot from the results of Ultraviolet visible (UV-Vis) and fluorescence titrations, respectively.

• 出版日期2018-1
• 单位内蒙古师范大学