均三嗪衍生物比色识别Cu2+及荧光识别Zn2+

以对氨基苯腈、邻叔丁基苯酚和3,5-二叔丁基水杨醛为原料合成了两种含有均三嗪对称结构的离子探针1和2，通过核磁共振氢谱、核磁共振碳谱、红外、质谱对合成产物进行表征，确认其结构。利用紫外吸收光谱和荧光光谱两种手段分别考察了探针1和探针2在N,N-二甲基甲酰胺（DMF）溶液中对金属离子（Cr³⁺、Mn²⁺、Fe³⁺、Co²⁺、Ni²⁺、Cu²⁺、Zn²⁺、Cd²⁺、Hg²⁺）的识别性能，通过核磁共振氢谱对探针1与Zn²⁺的识别机理进行研究。结果表明，两种探针热稳定性强，探针1溶液中加入Zn²⁺会引起荧光强度的显著增强，抗干扰性强，是一种高选择性识别Zn²⁺的荧光增强型探针；探针2中加入Cu²⁺后溶液由无色变成黄色，紫外光谱长波长处出现新吸收峰，是一种可裸眼识别的、高效的紫外Cu²⁺探针。

Colorimetric recognition of Cu2+ and fluorescence recognition of Zn2+ by s-triazine derivatives

Two ion probes 1 and 2 with s-triazine symmetric structure were synthesized with 4-aminobenzonitrile, 2-tert-butylphenol and 3,5-di-tert-butylsalicylaldehude as raw materials and its structure was characterized by ¹H NMR, ¹³C HMR, IR and mass spectrometry. The recognition performance of probes 1 and 2 for metal ions(Cr³⁺，Mn²⁺，Fe³⁺，Co²⁺，Ni²⁺，Cu²⁺，Zn²⁺，Cd²⁺，Hg²⁺) in the N,N-dimethylformamide (DMF) were investigated by UV-vis spectra and fluorescence spectra. Then, the mechanism of forming complexes with probe 1 and Zn²⁺ was discussed by ¹H NMR. It was found that the fluorescence intensity of probe 1 had a significant increase after adding Zn²⁺ to the probe 1 solution. Probe 1 was a fluorescently enhanced probe and had the selective recognition to Zn²⁺. The color of solution of probe 2 in DMF was changed from colorless to yellow after adding Cu²⁺, and a new absorption peak appeared at the long wavelength of UV-vis spectrum. Probe 2 was a highly efficient UV probe for Cu²⁺ that can be recognized by naked eye.