Studies on the Solution Structures of Lanthanide(Ⅲ) Complexes of DTPA-BIN by NMR

Abstract

Abstract: The solution structures of diamagnetic lanthanide(Ⅲ) complexes of DTPA-BIN(Ln=La, Y, Lu, Sc) have been investigated by ¹H NMR, ¹³C NMRand 2D NMR. For each complex, two or more species of asymmetric conformations with little distinction were identified at room temperature. And their solution structures vary with the radius of the central metals. NMRspectra support the hypothesis that Sc³⁺ with smaller radius formed an eight-coordinated structure with DTPA-BIN, La³⁺ with larger radius formed nine or ten-coordinated structures with DTPA-BIN, and Y(DTPA-BIN) and Lu(DTPA-BIN) had nine-coordinated solution structures. The solution structure of Gd(DTPA-BIN) was obtained from the similarity of radius between Gd³⁺ and Y³⁺, which is a nine-coordinated structure formed by three nitrogens, three acetate oxygens, two acetyl oxygens, one water molecule and a gadolinium(Ⅲ) cation.

Key words: DTPABIN, Lanthanide complex, NMR, Solution structure

CLC Number:

O614

TrendMD:

FENG Jiang-Hua, LI Xiao-Jing, LI Xin-Yu, PEI Feng-Kui . Studies on the Solution Structures of Lanthanide(Ⅲ) Complexes of DTPA-BIN by NMR[J]. Chem. J. Chinese Universities, 2001, 22(10): 1615.

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Studies on the Solution Structures of Lanthanide(Ⅲ) Complexes of DTPA-BIN by NMR

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