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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 36, Number 6
JKCSEZ 36(6)
December 20, 1992 

 
Title
Studies on Complexation of some Lanthanides with Diaza-18-crown-6-diisopropionic Acid

란탄족(Ⅲ)족 이온과 Diaza-18-crown-6-diisopropionic Acid의 착화합물에 관한 연구
Author
Jung Suk Kim, Chang Heon Lee, Sun Ho Han, Moo Yul Suh, Tae Yoon Eom, Jin Ha Park

김정석, 이창헌, 한선호, 서무열, 엄태윤, 박진하
Keywords
Abstract
이온성 거대고리 리간드, diaza-18-crown-6-diisopropionic acid(K22DAP)를 합성하였다. 이 화합물의 양성자화 상수와 몇 가지 란탄족원소와의 안정도 상수를 전위차적정 방법으로 측정하였다. 양성자화 상수는 logK1 = 9.05, logK2 = 8.37, logK3 = 1.88 및 logK4 = 0.99이고, La(Ⅲ), Nd(Ⅲ), Gd(Ⅲ) 및 Lu(Ⅲ)와의 안정도 상수 (logKML)는 각각 11.14, 11.43, 11.74 및 10.88이었다. 거대고리 이온운반 물질로서 K22DAP를 사용하고 TTA(thenoyltrifluoroacetone)를 추출제로 하여 란탄(Ⅲ)족 이온의 추출성질을 연구하였다. pH 8.0의 수상에서 La(Ⅲ)과 Nd(Ⅲ)이온은 주로 삼성분착물 Ln(K22DAP)TTA를 형성하였다.

An ionizable macrocyclic ligand, diaza-18-crown-6-diisopropionic acid(K22DAP) has been synthesized. Protonation constants of this compound and stability constants with some lanthanides were determined by potentiometric titration method. The protonation constants are logK1 = 9.05, logK2 = 8.37, logK3 = 1.88 and logK4 = 0.99. The logarithmic values of stability constants with La(Ⅲ), Nd(Ⅲ), Gd(Ⅲ) and Lu(Ⅲ) are 11.14, 11.43, 11.74 and 10.88 respectively. Extraction behavior of Ln(Ⅲ) ion was investigated using TTA(thenoyltrifluoroacetone) as extractant in the presence of K22DAP as macrocyclic ionophore. It was observed that Ln(K22DAP)TTA is the dominating species in aqueous complexes of La(Ⅲ) and Nd(Ⅲ).

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840 - 848
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