| N-硝基脲类的合成及其阴离子识别研究 |
| N-nitrourea Derivatives: Synthesis and Anion Recognition Properties |
|
| 摘要: 合成了两种新型的阴离子识别受体N-硝基-N-(2，6-二硝基-4-三氟甲基苯基)-N′-(4-氯苯基)脲(受体1)和N-硝基-N-(2，6-二硝基-4-三氟甲基苯基)-N′-(4-甲基苯基)脲(受体2)。利用紫外-可见吸收光谱考察了其与F-、Cl-、Br-、I-、H2PO4-、HPO42-、PO43-阴离子客体的识别作用。结果表明：在受体分子中加入F-、H2PO4-、HPO42-阴离子，其紫外-可见吸收光谱发生明显变化且溶液颜色由黄色变为紫色，而加入其他离子时无此现象。从而实现对这3种阴离子的裸眼检测。测定了结合物的结合比及结合常数。Job工作曲线表明受体与阴离子客体形成了1∶1结合物。结合常数表明：同一受体对不同阴离子的选择性不同，受体分子1选择性HPO42->H2PO4->F-，受体分子2选择性HPO42->F->H2PO4-；受体分子与同一阴离子客体的结合能力呈现规律性，1>2。提出了可能的结合模式。 |
| 关键词: N-硝基苯胺 脲 紫外-可见吸收光谱 阴离子识别 |
| 基金项目: |
| Abstract: Two colorimetric anion sensors N-nitro-N-(2,6-dinitro-4-trifluoromethylphenyl)-N′-(4-chlorophenyl)urea (receptor 1) and N-nitro-N-(2,6-dinitro-4-trifluoromethylphenyl)-N′-(4-methylphenyl)urea (receptor 2) were synthe-sized and characterized. The anion recognition properties for the two sensors using anions such as fluoride (F-) chloride (Cl-), bromide (Br-), iodide (I-), dihydrogen phosphate (H2PO4-), hydrogen phosphate (HPO42-) and phosphate (PO43-) in the form of their corresponding tetrabutylammonium salt in DMSO were evaluated by UV-Vis. Fluoride, dihydrogen phosphate and hydrogen phosphate gave rise to colour changes from yellow to purple, which were visible to the naked eyes. Job plot experiment indicated that 1∶1 stoichiometrical binding compounds were formed between the urea receptors and the anions. The selectivity and sensitivity of receptor 1 and receptor 2 for sensing anions were different, which was in the order of HPO42-> H2PO4-> F- for receptor 1 and HPO42- > F-> H2PO4- for receptor 2, the receptors had no evident binding effect with the other anions. For the same anion, the association constants followed the trend: receptor 1 > receptor 2. A possible structure of the binding compound between the receptors and the anions is also proposed. |
| Keywords: N-nitroaniline urea UV-Vis spectroscopy anion recognition |
| |
| 摘要点击次数: 1100 |
| 全文下载次数: 1256 |
| 江 洪,马续红,方 利,韦庆益.N-硝基脲类的合成及其阴离子识别研究[J].无机化学学报,2008,24(7):1073-1078. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
