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设计合成了一系列基于氨基硫脲的阴离子受体(M1~M4).此类受体以氨基硫脲基团为识别位点,以硝基苯基为信号报告基团,其中受体M1和M3可在乙腈溶液中高选择性的比色识别碘离子.在受体M1或M3的乙腈溶液中加入I–时,溶液的颜色由浅红色变成无色,而加入其他离子如F–,Cl–,Br–,AcO–,HSO4–,H2PO4–,ClO4–等阴离子时,受体溶液不会褪色.通过紫外滴定和核磁滴定等方法研究了受体选择性比色识别碘离子的机理.结果表明,受体通过其氨基硫脲基团上的三个NH质子与碘离子形成的三重氢键选择性的结合碘离子.在此过程中,受体构型发生转变,从而导致了颜色变化,产生了比色识别的效果.此类阴离子受体具有合成方法简便,产率高,识别效果好等优点.
A series of thiosemicarbazide-based anion acceptors (M1 ~ M4) were designed and synthesized.The thiosemicarbazone group as the recognition sites and nitrophenyl as the signal reporter group, among which the receptors M1 and M4 M3 can identify iodide ions with high selectivity in acetonitrile solution.I- When I- is added to acetonitrile solution of receptor M1 or M3, the color of the solution changes from light red to colorless, and other ions such as F-, Cl- , Br-, AcO-, HSO4-, H2PO4-, ClO4- and other anions, the acceptor solution will not fade. The mechanism of receptor selective colorimetric identification of iodide ions has been studied by UV titration and magnetic resonance titration , The receptor selectively binds to iodide through triple hydrogen bonds formed by the three NH protons on its thiosemicarbazide group with iodide ions during which the acceptor configuration shifts resulting in a color change that results The colorimetric recognition effect of such anion receptor has the advantages of simple synthesis method, high yield, good identification effect.