A new carbazole-based Schiff-base as fluorescent chemosensor for selective detection of Fe3+ and Cu2+

作者：Yang Lianlian; Zhu Weiju; Fang Min; Zhang Qing; Li Cun^*

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2013, 109: 186-192.

DOI：10.1016/j.saa.2013.02.043

• Schiff-base
• Fe3+, Cu2+ ion sensor
• Fluorescence enhancement
• Red shift

A new carbazole-based Schiff-base (I) as a multi-functional fluorescent chemosensor was designed, synthesized and characterized, which can selectively recognized Fe3+ and Cu2+ ions over a number of other metal ions. Compound I could detect Fe3+ and Cu2+ by UV-Vis method and fluorescence method. The stoichiometry ratio of 1-Fe3+ and 1-Cu2+ are 2:1 and 1:1, respectively, by the method of Job's plot. Moreover, the detection limits were calculated to be 4.23 x 10(-6) mol/L for Fe3+ ion and 5.67 x 10(-6) mol/L for Cu2+ ion. In the presence of Fe3+/Cu2+ ions, the fluorescence enhancement was attributed to the inhibited C=N isomerization and the obstructed excited state intramolecular proton transfer (ESIPT) of compound 1. At the same time, the interactions of compounds 1 with other ions were also investigated and unobvious UV-Vis absorption and fluorescence spectral changes were observed. Thus a new kind of chemosensor for Fe3+/Cu2+ with high sensitivity and selectivity was introduced.

• 出版日期2013-5-15
• 单位安徽大学