A highly sensitive and selective fluorescent probe for Fe3+ based on 2-(2-hydroxyphenyl)benzothiazole

作者：Liu Shu di; Zhang Liang wei; Liu Xiang^*

来源：New Journal of Chemistry, 2013, 37(3): 821-826.

DOI：10.1039/c2nj40978j

A novel fluorescent Fe3+ probe (L) based on 2-(2-hydroxyphenyl)benzothiazole has been synthesized and characterized. Both UV-vis and fluorescence spectroscopic studies demonstrated that L was highly sensitive and selective towards Fe3+ over other metal ions in acetonitrile. Upon binding with Fe3+, the emission band of L red-shifted from 370 nm to 420 nm and the fluorescence intensity was enhanced similar to 103-fold. The lowest detection limit for L is 6.04 x 10(-8) M and the dissociation constants K-d is 1.13 x 10(-11) M, which were calculated from the fluorescence titration curves. The detailed UV-vis and fluorescent titrations studies suggested that the binding stoichiometry of the L-Fe3+ complex was 2 : 1, and the structure between L and the Fe3+ complex was confirmed by the H-1 NMR titration. Then IR spectra provided further proof of the binding mode of the L-Fe3+ complex.

• 出版日期2013
• 单位兰州大学