高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (10): 1500.

• 论文 • 上一篇    下一篇

M(Ⅱ)(ArP)2-与核酸碱基(腺嘌呤,胞嘧啶)三元混配配合物稳定性研究

乐学义, 毋福海, 宋粉云, 计亮年   

  1. 中山大学化学系, 广州, 510275
  • 收稿日期:1995-01-11 修回日期:1995-05-10 出版日期:1995-10-24 发布日期:1995-10-24
  • 通讯作者: 计亮年
  • 作者简介:乐学义,男,33岁,博士研究生.
  • 基金资助:

    国家教委博士点基金;国家自然科学基金;南京大学配位化学国家重点实验室资助

Studies on Stability of Ternary Mixed-ligand Complexes of M (Ⅱ)(ATP)2-and Nucleic Acid Bases (Adenine and Cytosine)

LE Xue-Yi, WU Fu-Hai, SONG Fen-Yun, JI Liang-Nian   

  1. Department of Chemistry, Zhongshan University, Guangzhou, 510275
  • Received:1995-01-11 Revised:1995-05-10 Online:1995-10-24 Published:1995-10-24

摘要: 用pH电位滴定法测定了金属离子(M2+=Cu2+,Co2+,Ni2+,Zn2+,Cd2+与核酸碱基(L=腺嘌呤,胞嘧啶)形成的二元配合物以及与腺昔-5'-三磷酸(ATP)形成的三元混配配合物的稳定常数。三元配合物相对于二元配合物的稳定性用平衡常数表示。结果表明:ΔlgKm比咪唑或氨的相应配合物ΔlgKm大,这可能与三元混配配合物分子内存在配体间的芳环堆积、氢键作用以及πAB协同效应有关。

关键词: 三元混配配合物, ATP, 核酸碱基, 稳定常数, 堆积作用

Abstract: The stability constants of binary complexes ML2+(M2+=Cu2+, Co2+, Ni2+,Zn2+, Cd2+; L=Adenine, Cytosine) and their ternary complexes with ATP (Adenosine 5'-triphosphate) were determined by potentiometric pHtitration in aqueous solution (T=25℃,I=0.1mol/L NaClO4), the stability of ternary complexes in relation to the stability of their binary parent complexes was characterized by the equilibrium constants △lgKm(△lgKM=lgKM(ATP)LM(ATP)-lgKMLM) corresponding to the equilibrium M(ATP)2-+ML2+=M (ATP)L2-+M2+. The results obtained show that the △lgKmfor L=Adenine and cytosine is larger than that of the corresponding complexes of imidazole or ammonia due to the intramolecular ligand-ligand stacking interaction and hydrogen bond of the ternary complexes.

Key words: Ternary mixed-ligand complexes, ATP, Nucleic acid bases, Stability constants, Stacking interaction

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