高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (11): 1790.

• 研究论文 • 上一篇    下一篇

稀土在天然植物铁芒萁体内结合形式的光谱学研究

洪法水1, 魏正贵2, 赵贵文2   

  1. 1. 苏州大学生命科学学院生物系, 苏州 215006;
    2. 中国科学技术大学化学系, 合肥 230026
  • 收稿日期:2000-10-09 出版日期:2001-11-24 发布日期:2001-11-24
  • 通讯作者: 洪法水(1960年出生),男,博士,教授,从事生物无机化学研究.E-mail:hongfshcn@sinz.com E-mail:hongfshcn@sinz.com
  • 基金资助:

    国家自然科学基金(批准号:29805003);苏州大学人才引进基金资助

Studies of Bound Form on Rare Earths in a Natural Plant Fern Dicranopteris Dichotoma by Spectroscopy

HONG Fa-Shui1, WEI Zheng-Gui2, ZHAO Gui-Wen2   

  1. 1. Department of Biology, College of Life Science, Suzhou University, Suzhou 215006, China;
    2. Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
  • Received:2000-10-09 Online:2001-11-24 Published:2001-11-24

PDF (PC)

被引次数

56

摘要： 利用ICP-MS研究了江西赣州沙河稀土矿区天然植物铁芒萁体内稀土元素的分布规律,发现叶片和叶绿素中Ce含量最高,分别占其稀土总量的79.43%和66.71%.铁芒萁叶片光系统(PS)荧光发射峰较普通植物紫移15～25nm,且峰强是PS的6.79倍,表明PS活性提高.由于铁芒萁叶绿素中稀土叶绿素含量较低(约占叶绿素总量的0.1%),测定的UV-Vis和FTIR光谱特征与标样叶绿素a相似,未能反映出稀土的配位信息.而利用EXAFS则表征出在铁芒萁叶绿素中Ce为八配位,Ce—N键长为0.252nm,推测Ce是与两个卟啉环配位的,为一双层结构.

关键词: 稀土元素, 铁芒萁, 叶绿素, EXAFS

Abstract: Distribution of REand structure characterization of REchlorophyll in a natural plant fern Dicranopteris Dichotoma in rare earth mining area were studied by spectrocopy. The results showed that the cerium content in total rare earths(79.43%, 66.71%) was the highest in leaf and chlorophyll, respectively. The fluorescence emission peaks of photosystem Ⅱ in D. Dichotoma were more violet shift by 15～25 nm than that of common plant. The fluorescence intensity of photosystem Ⅱ was as 6.79 time as that of photosystem Ⅰ. It showed that REScan increase the activities of photosystem Ⅱ. The spectral characterization of UV Vis and FTIRon chlorophyll a in D. dichotoma are similar as standard chlorophyll a and couldn't suggest coordination information on REs for its very low contents of REchlorophyll in D. Dichotoma. Extended X-ray absorption fine structure(EXAFS) spectral analysis revealed that cerium coordinated two porphyrin rings with coordination number of eight, the bond length of Ce-Nwas 0.252 nm, respectively; Ce-chlorophyll a may have bilayer structure in D. Dichotoma.

Key words: Rare earth elements, Dicranopteris Dichotoma, Chlorophyll, EXAFS

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