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KMID : 1059519920360060840
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Journal of the Korean Chemical Society
1992 Volume.36 No. 6 p.840 ~ p.848
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Studies on Complexation of some Lanthanides with Diaza-18-crown-6-diisopropionic Acid
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Kim Jung-Suk
Lee Chang-Heon
Han Sun-Ho
Suh Moo-Yul
Eom Tae-Yoon
Park Jin-Ha
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Abstract
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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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