高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (3): 331.

• 论文 •    下一篇

镨叶绿素a分子结构的确定

魏正贵1, 洪法水1, 赵贵文1, 陶冶2, 胡天斗2, 王渭2, 刘涛2, 谢亚宁2, 吴忠华2   

  1. 1. 中国科学技术大学化学系, 合肥 230026;
    2. 中国科学院高能物理研究所同步辐射研究室, 北京 100039
  • 收稿日期:1999-05-13 出版日期:2000-03-24 发布日期:2000-03-24
  • 通讯作者: 陶　冶(1969年出生),男,博士,副研究员,从事生物无机化学研究.
  • 基金资助:

    国家自然科学基金(批准号:29805003和29271030)

Determination of Double Decker Sandwich Structure of Praseodymium-chlorophyll a Molecule

WEI Zheng-Gui1, HONG Fa-Shui1, ZHAO Gui-Wen1, Tao-Ye2, Hu-Tian-Dou2, WANG Wei2, LIU Tao2, XIE Ya-Ning2, WU Zhong-Hua2   

  1. 1. Chemistry Department, University of Science and Technology of China, Heifei 230026, China;
    2. Instituteof High Energy Physics, the Chinese Academy of Sciences, Beijing 100039, China
  • Received:1999-05-13 Online:2000-03-24 Published:2000-03-24

PDF (PC)

被引次数

18

摘要： 通过合成镨叶绿素a(Pr-Chla)研究了稀土在叶绿素中的结合方式.Pr-Chla的紫外可见光谱(UV-Vis)、红外光谱(FTIR)证实镨离子已配位到叶绿素a的卟啉环上.其磁圆二色谱(MCD)在Soret带具有双层夹心卟啉的特征结构;通过扩展X射线吸收精细结构谱(EXAFS),采用双层夹心结构模型拟合,确定了Pr周围的近邻结构.表明合成镨叶绿素a具有双层夹心结构.Pr(Ⅲ)夹于两个卟啉环之间,与上下卟啉环上共8个N原子配位,Pr—N键平均键长0.242nm.

关键词: 镨叶绿素a, EXAFS, MCD, 分子结构

Abstract: The Pr(Ⅲ) complex of Chlorophyll a was synthesized and characterized. The results of UV Vis and IRspectra indicate the coordination of Pr(Ⅲ) to the porphyrin rings. The special bands in Soret band region in MCDspectra shown a transition type of the sandwich structure porphyrin complexes. By extended Xray Absorption Fine Structure(XAFS) method, a double decker sandwich structure was well fitted, in which Pr is surrounded by eight nitrogen atoms from two porphyrin rings. Combining the MCDwith EXAFSresults, it is believed that the binding mode of Pr ion in chlorophyll a is a sandwich structure with the Pr—Nbond length of average 0.242 nm.

Key words: Pr-substituted Chlorophyll a, EXAFS, MCD, Molecular structure

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