新型氨基脲衍生物的合成及其阴离子识别性能

以3-异氰酸丙基三乙氧基硅烷和2, 4-二硝基苯肼为原料，制备了一种氨基脲衍生物阴离子受体R，其结构通过1H/13C NMR等方法表征。在纯DMSO体系下，受体R通过紫外-可见吸收光谱的变化及溶液颜色的显著差别对F-、Ac-和CN-离子表现出良好的识别能力。此外，通过向体系中加入30%的竞争溶剂H2O可以达到对CN-离子的单一识别效应。根据Benesi-Hidebrand方程，受体R单一识别氰根离子的络合常数为8.58 ? 103 L/mol，且检出限为1.47 uM，Job曲线分析证实受体与阴离子的结合比为1 : 1。利用1H NMR滴定实验及理论计算表明受体R与阴离子是以氢键形式相结合的识别机制，未发现脱质子过程。

A High Selectivity of New Semicarbazide Derivative for the Recognition of CN-

A semicarbazide derivative R has been synthesized using 3-propyl isocyanate triethoxysilane and 2, 4-Dinitrophenylhydrazine as raw material and characterized by 1H/13C NMR and other methods. The receptor R exhibited excellent recognition capability for F-, Ac- and CN- by obvious changes of UV-Vis spectral and solution color in DMSO solution. In addition, The single recognition effect of the receptor R on CN- can be achieved by adding 30% of the competitive solvent H2O to the DMSO system. According to the Benesi-Hidebrand equation, receptor R recognized CN- with a complex constant of 8.58 ? 103 L/mol and a detection limit of 1.47 uM, and form a 1 : 1 hydrogen bond complex with anions by Job curve. The recognition mechanism of receptor R and anion using hydrogen bonding was explained through 1H NMR titration and theoretical calculation, and no deprotonation behavior was found.