The Preparation And Anion Sensing Of Triphenylamine Based Fluorescent Chemosensors

Ions play an important role in environmental science and life sciences.Therefore,how to rapidly sense and detect ions with high selectivity and sensitivity has become a challenge and important task to researchers.In this paper,three triphenylamine based fluorescent chemosensors L1,L2 and L3 were successfully synthesized and fully characterized by Infrared spectroscopy,¹H-NMR,¹³C-NMR,mass spectrometry and single crystal X-ray diffraction.Futher,UV-vis and fluorescence spectroscopy were used to study the luminescence properties of the three compounds before and after the addition of investigated ions.The results showed that fluorescent chemosensors L1,L2 and L3 could recognize target ions,and L1 could be used as a fluorescent bifunctional probe for Hg²⁺and CN^-with high selectivity and sensitivity,which was not disturbed by the co-presence of other ions.Moreover,the solution color changed with addition of the target analytes,suggesting that the colorimetric sensing of Hg²⁺and CN^-by L1 was available.In addition,the sensing mechanism was carried out by Job‘s Plot,suggesting that a nucleophilic reaction by CN^-to the C atom of C=N was happening and lead to the fluorescence quenching.Similarly,L2 and L3 acted as a good fluorescent chemosensors for Cu²⁺and OH^-,respectively.The quanlitative and quantitative detection of the L2 were realized by using UV-vis spectroscopy.The quanlitative detection of the L3 were realized by using UV-vis spectroscopy.