N,N-二甲基吡啶苯甲醛缩对二甲氨基苯甲酰腙的合成及对Cu2+的选择性识别

设计合成了可用于识别铜离子的化合物N,N-二甲基吡啶苯甲醛缩对二甲氨基苯甲酰腙(1), 通过¹H NMR, ¹³C NMR和MS等对其结构进行了表征; 采用荧光光谱和吸收光谱法研究了化合物1与金属离子间的相互作用. 结果表明, 化合物1对Cu²⁺ 呈现良好的选择性, Cu²⁺ 的加入使化合物1的荧光强度增强12.5倍, 加入其它金属离子如Fe³⁺, Zn²⁺, Pb²⁺, Hg²⁺, Cd²⁺, Co²⁺, Ni²⁺, Li⁺, K⁺, Ca²⁺, Mg²⁺ 和 Ag⁺, 仅引起化合物1荧光强度的微降. 采用双倒数线性回归拟合法计算可知, 化合物1与Cu²⁺ 形成了1: 1型强发光配合物, 结合常数为2.0×10⁷ L/mol.

Synthesis of N,N-Dimethyl Pyridine Benzaldehyde-4-dimethylaminobenzoylhydrazone and Its Application for Selective Recognizing Cu2+

A fluorescence chemosensor, N,N-dimethyl pyridine benzaldehyde-4-dimethylaminobenzoylhydrazone was synthesized and confirmed by means of ¹H NMR, ¹³C NMR and MS. The interactions between the metal ions and compound 1 were investigated via fluorescence spectrophotometry and UV-Vis spectroscopy. The results indicated that compound 1 showed a highly selective response to Cu²⁺. The addition of Cu²⁺ induced a dramatic enhancement in the fluorescence of compound 1 by 12.5 folds, whereas the other metal ions had little fluorescence quenching, for example Fe³⁺, Zn²⁺, Pb²⁺, Hg²⁺, Cd²⁺, Co²⁺, Ni²⁺, Li⁺, K⁺, Ca²⁺, Mg²⁺ and Ag⁺. Double reciprocal linear plot method showed that compound 1 coordinated with Cu²⁺ to form 1: 1 stable luminescent complex and the binding constants was ca. 2.0×10⁷ L/mol.