核磁共振法研究DTPA-BIN稀土配合物的溶液结构  

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

作　　者：冯江华[1] 李晓晶[1] 李欣宇[1] 裴奉奎[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《高等学校化学学报》2001年第10期1615-1619,共5页Chemical Journal of Chinese Universities

基　　金：波谱与原子分子物理国家重点实验室和长春市科技发展计划资助

摘　　要：用核磁共振方法研究了抗磁稀土配合物 Ln( DTPA-BIN) ( Ln=La,Y,Lu,Sc)的水溶液结构 . 1 H和1 3 C NMR谱的谱形特征表明 ,每一种配合物在水溶液中存在着两种以上不对称的异构体 ,异构体之间的差别较小 .并由 Y3+ 与 Gd3+ 离子半径的相似性推测出 Gd( DTPA-BIN)的溶液结构 ,即 DTPA-BIN分子提供 8个配位点 :3个骨架氮、 3个乙羧基氧及 2个酰胺氧 ,1个水分子占据另一个配位点 ,从而与 Gd3+ 形成了九配位结构 .The solution structures of diamagnetic lanthanide(Ⅲ) complexes of DTPA\|BIN(Ln=La, Y, Lu, Sc) have been investigated by \{\}\+1H NMR, \{\}\+\{13\}C NMR and 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. NMR spectra support the hypothesis that Sc\+\{3+\} with smaller radius formed an eight\|coordinated structure with DTPA\|BIN, La\+\{3+\} 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 Gd\+\{3+\} and Y\+\{3+\}, which is a nine\|coordinated structure formed by three nitrogens, three acetate oxygens, two acetyl oxygens, one water molecule and a gadolinium(Ⅲ) cation.

关 键 词：二乙三胺五乙酸-双(异烟肼)酰胺 稀土配合物 核磁共振 溶液结构 医学诊断 造影剂 核磁共振成像 

分 类 号：R445.2[医药卫生—影像医学与核医学] R981.9[医药卫生—诊断学]