水溶液中新型四氮杂二乙酸基取代大环及其镧系配合物的热力学研究

THERMODYNAMIC STUDY ON THE N DIACETIC ACID SUBSTITUTED TETRAAZAMACROCYCLE AND ITS AQUEOUS LANTHANIDE COMPLEXES

多氮杂大环及其配合物一直是人们感兴趣的研究领域。因为它们可以作为研究生物体系的模型化合物，并已成功地用于有机旋光物质的拆分分离和用作液液、液固萃取、相转移催化、富集金属和制做离子选择电极［１－６］。１实验部分１．１Ｈ２Ｌ１·４ＨＮＯ３·４Ｈ２Ｏ的合成...

The protonation constants of the macrocycle H 2L 1 ( c meso 2,4,4,11,13,13 hexamethyl 1,5,10,14 tetraazacyclooctadecane N,N' diacetic acids)were determined potentiometricly and by computer fitting in 0.5 mol·L -1 KNO 3 solution at 25±0.1℃, 30±0.1℃ and 40±0.1℃. The stability constants of the 1∶1 complexes of H 2L 1 with La 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Dy 3+ , Yb 3+ were determined by the same method at 40±0.1℃. The ΔH、 ΔS and ΔG of the coodination reaction of H 2L 1 with H + in the aqueous solution were found.