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ＣＨ＿３─基团的氮原子翻转速率要比远离ＣＨ＿３─的小．活化能与金属离子的离子势呈线性关系。
The temperature dependence of 1H NMR spectra of the In(Ⅲ)and Y(Ⅲ)complexes of 1,2-propanediaminetetraacetic acid(1 ,2-PDTA)was observed and investigated.The four different AB quartets reveal that the eight acetate methylenic protons of In(Ⅲ)and Y(Ⅲ)-1,2-PDTA are in different magnetic environment.The AB interchange phenomena due to nitrogen inversion were observed in the temperature range of 90-140℃.The rate constants and the activation parameters were derived. The N atom 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第10期1510-1513,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
PDTA
铟
配合物
动态
NMR
Intramolecular interchange process,1,2-PDTA,DNMR
