应用化学 ›› 1992, Vol. 0 ›› Issue (4): 41-45.

• 研究论文 • 上一篇    下一篇

水溶液中稀土离子与甘氨酰丙氨酸作用的NMR研究

任吉民, 裴奉奎, 王文韵, 倪嘉缵   

  1. 中国科学院长春应用化学研究所, 长春 130022
  • 收稿日期:1991-07-02 修回日期:1991-09-11 出版日期:1992-08-10 发布日期:1992-08-10
  • 基金资助:
    国家自然科学基金

NMR STUDY OF INTERACTION BETWEEN DIPEPTIDE GLY-ALA AND LANTHANIDE IONS IN AQUEOUS SOLUTION

Ren Jimin, Pei Fengkui, Wang Wenyun, Ni Jiazuan   

  1. Changchun Institute of Applied Chemistry, Academia Sinica Changchun 130022
  • Received:1991-07-02 Revised:1991-09-11 Published:1992-08-10 Online:1992-08-10

摘要: 利用1H和13C NMR技术研究了水溶液中稀土离子与二肽甘氨酰丙氨酸(以下简称甘-丙二肽,记为GA)的配位作用。由稀土诱导位移的浓度依赖关系计算了Yb与甘-丙二肽配合物的稳定常数。测定了重稀土离子Dy3+、Ho3+、Er3+、Tr3+和Yb3+作用下GA的13C诱导位移,并根据Reuben方法对稀土诱导位移进行了线性相关分析。对配合物中配体骨架构象的模拟分析指出,Cl-C2-N-C3为旁式,C2-N-C3-C4和C5-C2-N-C3为反交叉式。系统比较了4种含甘氨酰二肽的侧基大小对配合物稳定常数、配体构象和配合物溶液结构的影响。

关键词: 甘氨酰丙氨酸, 稀土诱导位移, NMR

Abstract: 1H and 13C NMR techniques were used to study complexation of lanthanide ions with Gly-Ala in aqueous solution. For Yb complex with Gly-Ala the stability constant was calculated from the concentration dependence of lanthanide-induced shifts. 13C shifts induced by heavy lanthanide ions Dy3+, Ho3+, Er3+, Tm3+ and Yb3+ were analyzed by Reuben's method. The simulation for ligand conformation of lanthanide complex with Gly-Ala shows that the ligand segment C1-C2-N-C3 is in gauche form,while the segments C2-N-C3-C4 and C5-C2-N-C3 in trans form. The effects of side-group size of several glyeine-eontaining dipeptides on complex stability constants, ligand conformations and structure of complexes in solution were discussed.

Key words: glycyl-alanine, lanthanide-indueed shift, NMR