高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (10): 1510.

• 论文 • 上一篇    下一篇

In(Ⅲ)－和Y(Ⅲ)－1,2－PDTA配合物的动态核磁共振研究

宋瑞方, 秦松岩, 刘群, 刘广民   

  1. 吉林大学理论化学研究所, 分子光谱和分子结构国家重点实验室, 长春, 130023
  • 收稿日期:1993-10-15 修回日期:1994-03-09 出版日期:1994-10-24 发布日期:1994-10-24
  • 通讯作者: 宋瑞方,男,56岁,教授.
  • 作者简介:宋瑞方,男,56岁,教授.
  • 基金资助:

    国家自然科学基金

Dynamic Nuclear Magnetic Resonance of In(Ⅲ)and Y(Ⅲ)-1,2-Propanediaminetetraacetic Acid

SONG Rui-Fang, QIN Song-Yan, LIU Qun, LIU Guang-Min   

  1. Institute of Theoretical Chemistry, Key Laboratory of Molecular Spectra and Structrue, Jilin University, Changchun, 130023
  • Received:1993-10-15 Revised:1994-03-09 Online:1994-10-24 Published:1994-10-24

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摘要： 研究了In(Ⅲ)和Y(Ⅲ)-1,2-丙二胺四乙酸配合物1HNMR谱的温度依赖性,其结果显示出8个乙酸质子处于不同的磁环境中,分4组AB谱。AB谱交换现象由氮原子翻转引起,通过全线型分析求得了速率常数及相关热大学参数。对不对称的氮原子,其翻转速率不同,靠近CH3─基团的氮原子翻转速率要比远离CH3─的小。活化能与金属离子的离子势呈线性关系。

关键词: 分子内交换过程, 1, 2－PDTA, DNMR

Abstract: The temperature dependence of 1H NMRspectra of the In(Ⅲ)and Y(Ⅲ)complexes of 1, 2-propanediaminetetraacetic acid(1 , 2-PDTA)was observed and investigated.The four different ABquartets reveal that the eight acetate methylenic protons of In(Ⅲ)and Y(Ⅲ)-1, 2-PDTAare in different magnetic environment.The ABinterchange phenomena due to nitrogen inversion were observed in the temperature range of 90-140℃.The rate constants and the activation parameters were derived. The Natom near the methyl group has smaller inversion rate than that a little far away the methyl group.In addition, the linear relation between activation energy(Ea)and metal ion potential(z/r)is established for In(Ⅲ), Y(Ⅲ), Zn(Ⅱ), Mg(Ⅱ)and Cd(Ⅱ)-1, 2-PDTA.

Key words: Intramolecular interchange process, 1,2-PDTA, DNMR

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