A novel polydentate Schiff-base derivative developed for multi-wavelength colorimetric differentiation of trace Fe2+ from Fe3+

作者：Yan, Zhengquan^*; Zhu, Yanjie; Xu, Jie; Wang, Cong; Zheng, Yuyu; Li, Pengyue; Hu, Lei^*; You, Jinmao^*

来源：Analytical Methods, 2017, 9(44): 6240-6245.

DOI：10.1039/c7ay02167d

• CARBON DOTS
• IRON-ION
• SPECTROPHOTOMETRIC DETERMINATION
• FLUORESCENT CHEMOSENSOR
• DISCRIMINATE FE3+
• FE(II)
• IRON(III)
• SENSOR
• ACID
• SYSTEM

A novel Schiff-base derivative containing polydentate ligands, N-2'-hydroxyl-1'-naphthyl methylene-3-hydroxyl-2-amino pyridine (NNAP), was identified and developed. After its structure was characterized by FTIR, H-1 NMR, mass spectra and element analyses, it was noted that NNAP displayed multi-wavelength colorimetric responses to Fe2+ and Fe3+, accompanied by differentiable color changes, i.e., from yellow to brown in the presence of Fe2+ but to colorless upon addition of Fe3+. Importantly, the multi-wavelength colorimetric responses to trace Fe2+ and Fe3+, i.e., at 522 nm, 448 nm and 389 nm for Fe2+ detection, and at 448 nm and 389 nm for Fe3+ detection, could efficiently eliminate system error. Their different action mechanisms, a 1 : 1 complex mode for NNAP-Fe2+ and 1 : 2 for NNAP-Fe3+, were proposed and confirmed by means of a Job's plot and theoretical calculation. NNAP would be a practical probe for multi-wavelength colorimetric differentiation of trace Fe2+ from Fe3+.

• 出版日期2017-11-28
• 单位曲阜师范大学; 皖西学院