N-芳基-N′-(4-乙氧基苯甲酰基)硫脲衍生物阴离子识别性能的光谱研究

Studies on the Anion Recognition of N-Aryl-N'-(4-Ethyloxybenzoyl) Thioureas Derivatives by Spectroscopy

利用紫外-可见吸收光谱及1H NMR考察了两种N-芳基-N′-(4-乙氧基苯甲酰基)硫脲作为受体分子与F-,Cl-,Br-,I-,CH3COO-,H2PO4-,HSO4-,NO3-等阴离子的作用。结果表明,客体阴离子F-,CH3COO-,H2PO4-可以与该类受体分子形成氢键配合物,溶液颜色由无色转变为黄色,而加入其他阴离子则无变化。测定了主客体配合物的稳定常数和化学配位比,对苯环上不同取代基的受体分子与不同阴离子客体的识别作用以及同一受体对不同阴离子的识别作用进行了比较,其识别性能呈现规律性变化,提出了可能的配合物的结合模式。

The interactions of N-aryl-N＇-（4-ethyloxybenzoyl） thioureas derivatives and anions such as F^-,Cl^-,Br^-,I^-,CH3COO^-,H2PO4^-,HSO4^-,NO3^- in DMSO were investigated by UV-Vis and ^1H NMR spectroscopy. The results showed that hydrogen-bonding complexes were formed between receptors and the three anions such as F^-, CH3 COO^- and H2 PO4^-, and the solutions turned light yellow from colorlessness, but there had no evident binding with Cl^-, Br^-, I^-, HSO4^- and NO3^-. It was regular that the two receptors had different binding ability with F^-, CHACOO^- and H2PO4^-. For the same anion, the association constants followed the trend： receptor 1a〉 receptor 1b. The UV-Vis data indicated that a 1：1 stoichiornetry complex was formed.