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我们合成了五种新的不对称偶氮羧衍生物,并研究了它们与钙离子之间的一种特殊反应—β型反应,考察了试剂分子结构与反应性能的关系.着重探讨了对羧基偶氮羧与钙离子的β型反应行为,在柠檬酸介质中,钙离子与该试剂形成组成比为1:2的灵敏的稳定配合物,最大吸收波长为718nm(△λ=157nm),表观摩尔吸光系数ε=1.51×10~5L·mol~(-1)·cm~(-1),测定条件下,1—13μgCa/25mL 符合 Beer 定律,采用小体积显色,反应可在15分钟内进行完全,配合物可稳定4小时不变.动力学研究结果表明,对羧基偶氮羧与钙离子只发生β型反应,反应级数为2.
We synthesized five new asymmetric azocarboxylate derivatives and studied a special reaction between them and calcium ion, the β-type reaction, and investigated the relationship between the molecular structure of the reagent and the reaction performance. In the citric acid medium, the calcium ion and the reagent form a sensitive stable complex with a compositional ratio of 1: 2, the maximum absorption wavelength is 718 nm (△ λ = 157 nm) The molar extinction coefficient ε = 1.51 × 10-5L · mol -1 · cm -1. Under the conditions of the measurement, 1-13 μgCa / 25mL accorded with Beer’s law and the color was developed in a small volume. The reaction can be carried out in 15 minutes , The complexes were stable for 4 hours.The results of kinetic study showed that only β-type reaction occurred between carboxycarboxylazocarboxylates and calcium ions, and the order of reaction was 2.