波谱学杂志 ›› 1996, Vol. 13 ›› Issue (1): 25-34.

• 研究论文 • 上一篇    下一篇

水溶液中组氨酸与金属镉离子配位点的研究

何发虎, 毛希安   

  1. 中国科学院武汉物理研究所波谱与原子分子物理国家重点实验室, 武汉 430071
  • 收稿日期:1995-03-10 修回日期:1995-04-26 出版日期:1996-02-05 发布日期:2018-01-17
  • 基金资助:
    国家自然科学基金

COORDINATION SITES OF HISTIDINE TO CADMIUM(Ⅱ) AS STUDIED BY NMR

Ha Fahu, Mao Xian   

  1. State Key Laboratory of Magnetic Resoance and Atomic and Molecular Physics, Wuhan Institute of Physics, the Chinese Academy of Sciences Wuhan 430071
  • Received:1995-03-10 Revised:1995-04-26 Online:1996-02-05 Published:2018-01-17

摘要: 对不同pH值条件下Cd2+·His为1:1和1:2的二元体系和在相同pH值不同配比条件下进行了113Cd、13C、1H NMR观测和研究.对四比为1:1,pH=2.61和pH=5.06的该体系和配比为1:2,pH=3.48及pH=7.10的体系进行了不去偶及选择性照射1H观测113Cd的NOE实验.根据113Cd的话线变化及13C谱线和化学位移的变化及-维NOE实验.我们可以得出结论:当pH<4.0时.组氨酸中仅羧基氧和溶剂H2O一起参与配位;而当pH>4.0时,组氨酸中咪唑环上的N-1也参与了配位.

关键词: 组氨酸, pH值, 113Cd NMR, 络合, 配位点

Abstract: 1H、13C、113Cd NMR were applied to the study of the coordination sites of histidine to Cadmium (Ⅱ) in aqueous solutions with varied pH values and compositions.The chemical shifts、line broadening and NOE effects can lead to the confusion that when PH<4.0, histidine coordinates to Cd2+ with the carboxyl oxygen, when PH>4.0, both the carboxyl oxygen and imidazole nitrogen are capable of forming coordination bond to Cd2+.

Key words: Histidine, pH value, 113Cd NMR, Coordiation, coordination sites