基于N-(4-甲氧基苯亚甲基)-4-羧基苯亚胺的荧光化学传感器对Fe3+的识别研究

基于N-(4-甲氧基苯亚甲基)-4-羧基苯亚胺的荧光化学传感器对Fe3+的识别研究
摘要：由对甲氧基苯甲醛和对氨基苯甲酸反应合成的Schiff碱N-(4-甲氧基苯亚甲基)-4-羧基苯亚胺(SB)能发射蓝色荧光。用荧光光谱研究了SB对金属离子的响应性能。结果表明，Fe3+能与SB形成1:1型非辐射的金属-配体的电荷转移配合物，而导致SB的荧光几乎完全淬灭，淬灭常数为1.23*104 L•mol-1；Zn2+能使SB的荧光增强，其它金属离子不能使SB的荧光光谱产生显著的差别。Fe3+与SB形成的配合物的结合常数为9.47*103 L•mol-1，在6.00*10-6 mol•L-1到3.95*10-5 mol•L-1浓度范围内，F0-F与CFe3+成线性关系，直线方程为：F0-F=34850CFe3+-0.0421，相关因子为0.995。此方法测定Fe3+的检出限为3.1*10-6 mol•L-1，回收率5次测量的平均值为109%，相对标准偏差为0.13。结果表明,SB能作为特殊荧光化学传感器来选择性地测定Fe3+。

关键词：Schiff碱，荧光化学传感器，Fe3+
Abstract: The Schiff base N-(4-methoxylmethylene)-4-carboxylphenylimine(SB) was synthesized by the reaction of 4-methoxyl benzaldehyde with 4-amino benzoic acid. SB shows blue fluorescence. The responsive properties of SB on metal ions were investigated by fluorescent spectra. The results show that Fe3+ can form 1:1 nonradiative metal–to–ligand charge–transfer complexes with SB and completely quench SB fluorescence, whereas, Zn2+ can enhance SB fluorescence, other metal ions do not produce the pronounced difference from SB fluorescence spectra. The binding constant of SB with Fe3+ is 9.47*103 L•mol-1. Calibration curve of F0-F with CFe3+ shows linear relationship in the range from 6.00*10-6 mol•L-1 to 3.95*10-5 mol•L-1 with linear equation of F0-F=34850CFe3+-0.0421 and R2 of 0.995. The detection limit of Fe3+ is 3.1*10-6 mol•L-1. The recovery of Fe3+ was 104%, with R.S.D. of 0.14 (n=5). The results suggest that SB can act as a special fluorescent chemosensor for the appropriate detection of the selective sense of Fe3+.
 
Key words: Schiff base, fluorescence chemosensor, Fe3+

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