菲并咪唑-水杨醛席夫碱分子探针对Fe^(3+)、Cr^(3+)、Al^(3+)的检测

Application of Phenanthroimidazole-Salicylaldehyde Schiff Base Probe for the Detection of Fe^(3+), Cr^(3+) and Al^(3+)

基于菲并咪唑-水杨醛合成了分子探针SL,并用NMR、IR对其结构进行了确证。实验结果表明,探针SL对三价金属离子铁、铬、铝(Fe^(3+)、Cr^(3+)、Al^(3+))的识别具有较好的选择性和较高的灵敏度,并且几乎不受一价、二价离子的干扰。使用Job’s Plots法证明,探针SL与Fe^(3+)、Al^(3+)的结合比均为1:1,与Cr^(3+)的结合比为2:3,对Fe^(3+)、Cr^(3+)、Al^(3+)的检出限分别为3.09×10^(-8),4.82×10^(-8),2.89×10^(-8)mol/L。利用荧光光谱法探讨了探针SL对剧毒Cr^(3+)的检测行为,发现探针SL对Cr^(3+)离子有较好的选择性和灵敏度,是一种具有潜在应用价值的Cr^(3+)荧光探针。

A design, together with a synthesis, has been made of molecular probe SL based on phenamidazolesalicylaldehyde multifunctional molecular probe SL, with its structure confirmed by NMR and IR. These results show that the probe SL is characterized with a fine selectivity and sensitivity performance as for the identification of trivalent metal ions, such as iron(III), chromium(III), aluminum(III)(Fe3+, Cr3+, Al3+), hardly undisturbed by the monovalent and divalent ions. The Job’s Plots method verifies a binding ratio of 1:1 of probe SL to Fe3+ and Al3+ and a binding ratio of 2:3 to Cr3+. The detection limits of Fe3+, Cr3+, and Al3+ are 3.09×10-8 mol/L, 4.82×10-8 mol/L, 2.89×10-8 mol/L, respectively. Then, the detection of the highly toxic Cr3+ by the probe SL has been investigated by fluorescence spectroscopy. It is found that the probe SL has a good selectivity and sensitivity to the Cr3+ ion, proving it to be a Cr3+ fluorescence probe with potential application value.