论文部分内容阅读
文章讨论了助色团、溶剂和α型β型反应的关系。指出只有含吸电子能力较强的助色团如—Cl,—NO_2,—COCH_3,—COOH等的变色酸衍生物能和稀土元素发生β型反应,而含助色团—SO_3H,—PO_3H_2—AsO_3H_2等的变色酸衍生物和稀土元素仅发生α型反应.含有助色团—COCH_3,—NO_2,—Cl的偶氮羧类、偶氮胂类、偶氮膦类的不对称变色酸试剂与稀土元素形成β型络合物,在一定实验条件下,在水溶液中的络合物能被异戍醇所萃取,而含助色团—SO_3H等的变色酸衍生物试剂的稀土络合物,则不能被萃取。同时指出乙醇丙酮等溶剂不仅能抑制β型络合物的形成,而且对于α型络合物来说,乙醇、丙酮等溶剂能大大提高反应的灵敏度。
The article discusses the relationship between auxochromes, solvents and α-type β-type reactions. It is pointed out that only chromotropic acid derivatives with strong electron-attracting helical color groups such as -Cl, -NO 2, -COCH 3, -COOH and so on can react with rare earth elements to form β-type reactions, while auxochrome -SO_3H, -PO_3H_2- AsO_3H_2 and other chromotropic acid derivatives only react with the rare earth elements in the α-type reactions.Acycarboxylates containing achromatic groups -COCH_3, -NO_2, -Cl, arsine, azophosphines asymmetric chromotropic acid reagents and The rare earth elements form a β-type complex. Under certain experimental conditions, the complex in aqueous solution can be extracted by isoprenol, and the rare earth complexes of chromotropic acid derivative reagent containing auxochrome -SO_3H, It can not be extracted. At the same time, it is pointed out that solvents such as acetone can not only inhibit the formation of β-type complexes, but also improve the reaction sensitivity of α-type complexes such as ethanol and acetone.