三价镅、锔同α-羟基羧酸的络合及其与镨、钕的相似性  

TRIVALENT Am AND Cm COMPLEXES OF α-HYDROXY CARBOXYLIC ACID AND THEIR SIMILARITY TO Pr AND Nd

作　　者：杨裕生[1] 卢加春[1] 

机构地区：[1]西北核技术研究所

出　　处：《核化学与放射化学》1991年第2期65-70,共6页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金

摘　　要：本文综合了7种α-羟基羧酸同镅、锔的络合物稳定常数,包括测定的α-羟基-α-甲基戊酸(α-HMVA)的结果,分析了配体的结构对稳定常数的影响,并与镨、钕的情况进行了比较,讨论了相似的基础及其应用前景。The stability constants of the complexes of Am(Ⅲ) and Cm(Ⅲ) with α-hydroxy-α-methyl valeric acid (α-HMVA) , determined by static cation exchange at 25℃ and ionic strength of 0.5(NaClO4), are found to be β1= (2.12±0.11)×102, β2=(1.71±0.19)×104, β3 = (4.99±0.70)×106 for Am(Ⅲ) complexes and β1 = (2.42±0.05)×102,β2=(2 .70±0.11 )×104, β3 = (9.27+++++++0.40) ×105 for Cm(Ⅲ) complexes. The separation factor of Am(Ⅲ) and Cm(Ⅲ) is 1.86(based on β3) . It is the highest value being reported with α-hydroxy carboxylic acid as a ligand.The constants of Am(Ⅲ) and Cm(Ⅲ) with seven a-hydroxy carboxylic acids are compiled. All data but those of glycolic acid have been determined in this laboratory. The effects of different alkyl-group structure on constants and separation factor are discussed.In the presence of α-hydroxy carboxylic acid, the separation factor of Pr(Ⅲ) and Nd(Ⅲ) which are similar to those of Am(Ⅲ) and Cm(Ⅲ) are investigated. From the figure of αprNd v·s αAmCm, the relation of αprNd=1.5αAmCm can be established.This relation can also be derived by the use of semi-experience and semi-theory formula. Therefore, it is possible to find the best ligand for separation of Am(Ⅲ) and Cm(Ⅲ) based on data of Pr(Ⅲ) and Nd(Ⅲ).

关 键 词：镅 锔 镨 钕 α-羟基羧酸 稳定常数 

分 类 号：O614.35[理学—无机化学]