摘要
本文研究了Zn,Cd和Hg-1,3PDTA(1,3-丙二胺四乙酸)配合物的分子内交换过程的动力学.实验结果表明Mg,Ca和Sr-1,3PDTA配合物其配位健具有较大的迁移性,而Zn、Cd和Hg配合物分子内健的迁移性较小,属于长寿命的配位健.用全线型分析方法模拟了Zn、Cd和Hg配合物随温度变化的~1H NMR谱,得到了有关分子内过程的热力学参数.并讨论了N原子反转过程的活化能与中心金属离子的离子势之间的关系.
Reported here are the DNMR spectra of intramolecular processes of some diamagnetic complexes which were synthesized by the reactions of Zn(Ⅱ), Cd(Ⅱ ) and Hg(Ⅱ) with 1,3PDTA (1,3-propanediaminetetraacetic acid ), respectively. The rate constants and other thermodynamic parameters were obtained by the complete line shape anaylsis. The intramolecular exchange processes are discussed in this paper. It was found that the activation energies of these metal complexes are related to the electrostatic potential of the metal ions.
出处
《波谱学杂志》
CAS
CSCD
1992年第2期113-119,共7页
Chinese Journal of Magnetic Resonance
基金
国家自然科学基金资助课题
关键词
PDTA
金属配合物
NMR
配位键
Zn, Cd and Hg-1,3 PDTA complexes
Intramolecular exchange
DNMR