A colorimetric anion receptor was synthesized by a simple method where the phenylhydrazone moiety was need as binding sites. The anion recognition via hydrogen-bonding interactions can be easily monitored by anion com...A colorimetric anion receptor was synthesized by a simple method where the phenylhydrazone moiety was need as binding sites. The anion recognition via hydrogen-bonding interactions can be easily monitored by anion complexation induced changes in UV-vis absorption spectra. Moreover, the hydrogen bond formation between the phenylhydrazone N-H and acetate or fluoride anion was described on the basis of ^1H NMR experiments.展开更多
制备了一种硫脲分子PNTU探针,基于其对Hg^(2+)的专一性比色识别,建立了荧光猝灭法测定Hg^(2+)含量的方法。在4-溴-1,8-萘酐的乙醇溶液中,逐滴加入2 mL 80%(质量分数)水合肼溶液,反应完成后,经抽滤,乙醇、水洗涤后干燥,再加入10 mL吡咯烷...制备了一种硫脲分子PNTU探针,基于其对Hg^(2+)的专一性比色识别,建立了荧光猝灭法测定Hg^(2+)含量的方法。在4-溴-1,8-萘酐的乙醇溶液中,逐滴加入2 mL 80%(质量分数)水合肼溶液,反应完成后,经抽滤,乙醇、水洗涤后干燥,再加入10 mL吡咯烷,在氮气保护下继续反应,得到红褐色固体。将其溶于15 mL乙腈中,室温搅拌下滴加1 mL异硫氰酸苯酯,反应完成后,经减压浓缩、水洗得到PNTU探针。将PNTU探针溶液与体积比为8∶2的乙腈-4-羟乙基哌嗪乙磺酸缓冲液的混合液混匀,然后加入含Hg^(2+)的样品溶液,采用荧光猝灭法测定体系的荧光强度。结果显示:当加入Hg^(2+)时,体系的荧光强度明显降低,溶液颜色由黄色变成橙红色;干扰试验表明PNTU探针在有其他金属离子存在的情况下仍可检测出Hg^(2+);Hg^(2+)浓度在20.0μmol·L-1以内与其对应体系的荧光强度降低值呈线性关系,检出限(3S/N)为1.8 nmol·L-1;对实际水样进行3个浓度水平的加标回收试验,Hg^(2+)的回收率为99.6%~104%,测定值的相对标准偏差(n=5)为0.85%~2.6%。基于PNTU探针制备了Hg^(2+)的检测试纸,可方便快捷地检测样品中是否存在Hg^(2+)。展开更多
A new colorimetric recognition receptor 1 based on the dual capability containing NH binding sites of selectively sensing anionic guest species has been synthesized. Compared with other halide anions, its UV/Vis absor...A new colorimetric recognition receptor 1 based on the dual capability containing NH binding sites of selectively sensing anionic guest species has been synthesized. Compared with other halide anions, its UV/Vis absorption spectrum in dimethyl sulfoxide showed the response toward the presence of fluoride anion with high selectivity, and also displayed dramatic color changes from colorless to yellow in the presence of TBAF （5 × 10^-5 mol/L）. The similar UV/Vis absorption spectrum change also occurred when 1 was treated with AcO^- while a little change with H2PO^-4 and OH^-. Receptor 1 has almost not affinity abilities to Cl^-, Br^- and I^-. The binding ability of receptor 1 to fluoride with high selectivity over other halides contributes to the anion size and the ability of forming hydrogen bonding. While the different ability of binding with geometrically triangular （AcO^-）, tetrahedral （H2PO^-4 ） and linear （OH^-） anions maybe result from their geometry configuration.展开更多
基金Project supported by the National Natural Science Foundation of China （No. 20371028, 20671052） and the Natural Science Foundation of Tianjin of China （No. 023605811）.
文摘A colorimetric anion receptor was synthesized by a simple method where the phenylhydrazone moiety was need as binding sites. The anion recognition via hydrogen-bonding interactions can be easily monitored by anion complexation induced changes in UV-vis absorption spectra. Moreover, the hydrogen bond formation between the phenylhydrazone N-H and acetate or fluoride anion was described on the basis of ^1H NMR experiments.
文摘A new colorimetric recognition receptor 1 based on the dual capability containing NH binding sites of selectively sensing anionic guest species has been synthesized. Compared with other halide anions, its UV/Vis absorption spectrum in dimethyl sulfoxide showed the response toward the presence of fluoride anion with high selectivity, and also displayed dramatic color changes from colorless to yellow in the presence of TBAF （5 × 10^-5 mol/L）. The similar UV/Vis absorption spectrum change also occurred when 1 was treated with AcO^- while a little change with H2PO^-4 and OH^-. Receptor 1 has almost not affinity abilities to Cl^-, Br^- and I^-. The binding ability of receptor 1 to fluoride with high selectivity over other halides contributes to the anion size and the ability of forming hydrogen bonding. While the different ability of binding with geometrically triangular （AcO^-）, tetrahedral （H2PO^-4 ） and linear （OH^-） anions maybe result from their geometry configuration.
