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本工作合成了系列8-羟基喹啉偶氮类衍生物,研究了8-羟基喹啉偶氮衍生物与金属阳离子相互作用的光谱研究。研究结果表明,8-羟基喹啉偶氮类衍生物对金属阳离子具有较高的选择性。衍生物D对Cd~(2+)具有较高的选择性,特征峰由437nm红移至453nm处,说明取代基对富电子的苯环的电子效应不同。金属阳离子的响应程度为Fe~(3+)>Cu~(2+)>Cd~(2+)>Al~(3+)>Ba~(2+)>Ca~(2+)>Na+,这可能与金属阳离子对主体化合物的分子内电荷诱导能力有关。金属Cu~(2+)对衍生物具有浓度识别作用,随着Cu~(2+)浓度的增加,电荷转移吸收峰先增加后下降,表明该衍生物D可定量识别Cu~(2+)。
This work synthesized a series of 8-hydroxyquinoline azo derivatives, 8-hydroxyquinoline azo derivatives and metal cation interaction spectroscopy studies. The results show that 8-hydroxyquinoline azo derivatives of metal cations have a high selectivity. Derivative D has a high selectivity for Cd 2+, with a red shift of the characteristic peak from 437 nm to 453 nm, indicating that the substituents have different electronic effects on electron rich benzene rings. The response of metal cations is Fe ~ (3 +)> Cu ~ (2 +)> Cd ~ (2 +)> Al ~ (3 +)> Ba ~ (2 +)> Ca ~ (2 +)> Na + This may be related to the intramolecular charge-inducing ability of the metal cation to the host compound. The metal Cu 2+ has a concentration recognition effect on the derivative. With the increase of Cu 2+ concentration, the charge transfer absorption peak first increases and then decreases, indicating that the derivative D can quantitatively identify Cu 2+, .