水杨醛-4-乙氧基苯甲酰肼腙对锌离子的高选择性识别

Highly Selective Recognition of Zn^(2+) by Salicylaldehyde 4-ethoxybenzoylhydrazone

设计合成了荧光传感分子水杨醛-4-乙氧基苯甲酰肼腙(1),应用吸收和荧光光谱研究了其对过渡金属离子(Zn2+,Cu2+,Ag+,Pb2+,Cd2+,Hg2+,Fe3+,Co2+和Ni2+)的响应.结果表明,1与过渡金属离子的配位作用能力相近,但1的荧光发射对锌离子表现出高选择性响应,乙腈中Zn2+的加入导致1的长波长荧光增强415倍,而其它过渡金属离子只引起1的荧光的略微增强.初步探讨了受体分子与锌离子的结合模式与荧光增强机理.

A fluorescent chemosensor,salicylaldehyde 4-ethoxybenzoylhydrazone（1） ,was designed and synthesized. 1 was investigated to recognize transition metal ions such as Zn^2＋ ,Cu^2＋ ,Ag^＋ ,Pb^2＋ ,Cd^2＋ , Hg^2＋ ,Fe^3＋ ,Co^2＋ and Ni^2＋ via its absorption and fluorescence spectra, it was found that 1 coordinated with the tested transition metal ions to a similar extent in the ground state,whereas its florescence showed a highly selective response to Zn^2＋ only. In acetonitrile,Zn^2＋ induced a dramatic enhancement in the fluorescence of 1 by 415 folds, whereas the other transition metal ions had little influence. Mechanism of cnhancement of 1＇s fluorescence by Zn^2＋ was briefly discussed.