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通过Suzuki偶联反应,分别将9-己基-9H-咔唑基团和三苯胺基团引入4’-(4-苯基)-2,2’,6’,2″-三联吡啶结构中,设计合成了两种具有D-π-A结构的三联吡啶衍生物(Tpy1和Tpy2),并经熔点、核磁共振、质谱及元素分析对其结构进行了表征。Tpy1和Tpy2对Hg2+比其他金属阳离子具有更好的选择性,可通过紫外分光光度法或紫外灯下肉眼观测对二氯甲烷溶液中的Hg~(2+)进行有效识别。密度泛函理论(DFT)量化计算结果表明,当探针与Hg~(2+)结合后,其分子内电荷转移(ICT)效应增强,吸收光谱红移31 nm。此外,探针分子中所连接的不同的供电子芳香基团可影响其对Hg~(2+)的识别效果,Tpy1和Tpy2检测限分别为2.51×10~(-6)mol/L和4.40×10~(-6)mol/L。探针分子对Cu~(2+)也有响应。
The 9-hexyl-9H-carbazole group and the triphenylamine group were introduced into the 4 ’- (4-phenyl) -2,2’, 6 ’, 2 "-terpyridine structure by Suzuki coupling reaction, Two kinds of terpyridine derivatives (Tpy1 and Tpy2) with D-π-A structure were designed and synthesized, and their structures were characterized by melting point, nuclear magnetic resonance, mass spectrometry and elemental analysis. The effects of Tpy1 and Tpy2 on Hg2 + Has better selectivity and can effectively identify Hg 2+ in dichloromethane solution by UV spectrophotometry or naked eye observation under UV light.The results of density functional theory (DFT) When combined with Hg 2+, the intramolecular charge transfer (ICT) effect is enhanced, and the absorption spectrum is redshifted by 31 nm. In addition, the different electron donating aromatic groups in the probe molecule may affect the Hg The detection limits of Tpy1 and Tpy2 were 2.51 × 10 -6 mol / L and 4.40 × 10 -6 mol / L, respectively, Also respond.