摘要
A new and efficient fluorescent sensor 4＇-hydroxy-3＇-[（4-antipyrineimino）methyl]-4-biphenylcarboni- trile（L） was prepared for the selective detection of Zn2＋ in aqueous ethanol medium. When excited at 419 nm, the fluorescent intensity of sensor L at 507 nm was remarkably increased more than 54-fold after adding Zn2＋ ions. The strong green emission of the solution can be easily identified by naked eye tinder UV light. Thus, sensor L behaves as a naked eye fluorescent ＂turn on＂ detector for Zn2＋ ions. The fluorescence enhancement might be attributed to the in- hibition of excited state intramolecular proton transfer（ESIPT） and C==N isomerization as well as the chelation en- hanced fluorescence（CHEF） effect. The complex solution of sensor L with Zn2＋ ions exhibited reversibility with ethylene diamine tetraacetic acid（EDTA） and the probe could be recycled for further use. Notably, sensor L could clearly distinguish Zn2＋ from Cd2＋. The interaction of sensor L with zinc ions was investigated by means of FTIR, 1H NMR and HRMS spectroscopy. Furthermore, sensor L has been applied for cell imaging studies.
A new and efficient fluorescent sensor 4＇-hydroxy-3＇-[（4-antipyrineimino）methyl]-4-biphenylcarboni- trile（L） was prepared for the selective detection of Zn2＋ in aqueous ethanol medium. When excited at 419 nm, the fluorescent intensity of sensor L at 507 nm was remarkably increased more than 54-fold after adding Zn2＋ ions. The strong green emission of the solution can be easily identified by naked eye tinder UV light. Thus, sensor L behaves as a naked eye fluorescent ＂turn on＂ detector for Zn2＋ ions. The fluorescence enhancement might be attributed to the in- hibition of excited state intramolecular proton transfer（ESIPT） and C==N isomerization as well as the chelation en- hanced fluorescence（CHEF） effect. The complex solution of sensor L with Zn2＋ ions exhibited reversibility with ethylene diamine tetraacetic acid（EDTA） and the probe could be recycled for further use. Notably, sensor L could clearly distinguish Zn2＋ from Cd2＋. The interaction of sensor L with zinc ions was investigated by means of FTIR, 1H NMR and HRMS spectroscopy. Furthermore, sensor L has been applied for cell imaging studies.
基金
Supported by the Natural Science Foundation of Shanxi Province, China（No.2013011040-6）, the Project Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, the Ministry of Education of China.
