首页 | 本学科首页   官方微博 | 高级检索  
     检索      

叶绿素稀土配位结构的EXAFS研究: 镧叶绿素a双层夹心分子 结构的确认
引用本文:魏正贵,洪法水,赵贵文,陶冶,胡天斗,刘涛,谢亚宁,尹明,李冰,杨建虹.叶绿素稀土配位结构的EXAFS研究: 镧叶绿素a双层夹心分子 结构的确认[J].化学学报,2000,58(5):559-562.
作者姓名:魏正贵  洪法水  赵贵文  陶冶  胡天斗  刘涛  谢亚宁  尹明  李冰  杨建虹
作者单位: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室,北京,100039
3. 地矿部岩矿测试技术研究所,北京,100037
4. 中国科学技术大学研究生院生物学部,北京,100039
基金项目:国家自然科学基金,29805003,
摘    要:通过合成镧叶绿素a(La-Chla),研究稀土在叶绿素中的赋存状态。La-Chla的紫外可见光谱(UV-vis)、红外光谱(FT-IR)证实,镧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结构的特征结构。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La周围的近邻结构,取得满意结果。表明合成镧叶绿素a具有双层夹心结构。La夹于两个卟啉环之间,与上下卟啉环上共八个N原子配位,La-N平均键长0.261nm。

关 键 词:稀土  镧络合物  叶绿素  分子结构  夹心化合物  卟啉  扩展X射线吸收谱法  结构谱
修稿时间:1999年5月1日

Determination of double decker sandwich structured La-substituted chlorophyll a by EXAFS
WEI Zheng-gui,HONG Fa-shui,ZHAO Gui-wen,TAO Ye,HU Tian-dou,LIU Tao,XIE Ya-Nin,YIN Ming,LI Bin,YANG Jian-Hong.Determination of double decker sandwich structured La-substituted chlorophyll a by EXAFS[J].Acta Chimica Sinica,2000,58(5):559-562.
Authors:WEI Zheng-gui  HONG Fa-shui  ZHAO Gui-wen  TAO Ye  HU Tian-dou  LIU Tao  XIE Ya-Nin  YIN Ming  LI Bin  YANG Jian-Hong
Institution:Univ Sci & Technol China, Dept Chem.Hefei(230026);Minist Geol & Mineral Resources, Inst Rock & Mineral Anal.Beijing(100037)
Abstract:Double decker sandwich lanthanoid porphyrins have been synthesized and characterized systematically. Chlorophyll is a representative of natural porphyrin derivatives. It is therefore interesting to study the chemical form of lanthanide in chlorophyll. We synthesized Lanthanum(III) Chlorophyll a derivatives, whose UV-vis and IR spectra confirm the coordination of La(III) to the porphyrin rings. MCD spectra show the special bands in Soret band region, which indicate a transition from sandwich structure porphyrin complexes. By extended X- ray absorption fine structure (EXAFS) method, it is found that the molecular structure of synthesized La-Chla can be well fitted by the double decker sandwich structure model that La is surrounded by eight nitrogen atoms from two porphyrin rings. The MCD and EXAFS results indicate that the La in chlorophyll a exist as a sandwich shaped complexes with an average La-N bond length of 0.261nm. To our best knowledge, this is the first example of La-Chla with a double decker sandwich molecular structure.
Keywords:La substituted Chlorophyll a  EXAFS  MCD  molecular structure  
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《化学学报》浏览原始摘要信息
点击此处可从《化学学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号