变温磁园二色谱研究叶绿素与镧的复合物

北京大学学报（自然科学版）

变温磁园二色谱研究叶绿素与镧的复合物

李赛君¹,张完白¹,高松²,吴瑾光²,井上秀成³

¹北京大学技术物理系，北京，100871;²北京大学化学系，北京，100871;³日本庆应大学，应用化学科，横浜，223

收稿日期:1995-03-08 出版日期:1996-03-20 发布日期:1996-03-20

Studies on Variable Temperature MCD Spectra A Complex of Chlorophyll-a and Lanthanum

LI Saijun¹, ZHANG Wanbai¹, GAO Song², WU Jinguang², HIDENARI Inoue³

¹Dept. Technol. Phys., Peking Univ., Beijing, 100871, SJLi@ihipms.pku.edu.cn; ²Department of Chemistry, Peking Univ., Beijing, 100871; ³Dept. Appl. Chem., Faculty of Sci. & Technol., Keio Univ., Yokahama, 223, Japan

Received:1995-03-08 Online:1996-03-20 Published:1996-03-20

摘要/Abstract

摘要： 在甲醇和醋酸体系中合成得到翠绿色的叶绿素镧配合物，研究了它和叶绿素a、脱镁叶绿素a的紫外可见光谱，并首次研究了它们的磁园二色性谱(MCD谱)。叶绿素镧的UV-Vis谱和MCD谱与叶绿素a的相似，但是与脱镁叶绿素a有明显的区别，从而证明了镧离子已配位到叶绿素的卟啉环上，并形成了金属叶绿素镧的配合物。三者的变温MCD谱均含有C项的贡献，对于C项的来源，初步推测为体系中产生的自由基，这有待于EPR谱和更宽温度范围的MCD研究来确认。此外，由MCD谱推断叶绿素镧与叶绿素a具有相似的单层结构。

关键词: 叶绿素a, 叶绿素镧, MCD谱

Abstract: La(Ⅲ)-chlorophyll-a was synthesized in mixed solution of methanol and acetic acid. The room temperature UV-Vis and variable temperature MCD spectra of La(Ⅲ)-chlorophyll-a, chlorophyll-a and pheophytin-a were studied in tetrahydro-2-methylfuran solvent. The UV-Vis and MCD spectra of La(Ⅲ)-chlorophy-a are very similar to those of chlorophyll-a, but different from those of pheophytin-a. This shows that porphyrin ring of pheophytin-a is coordinated to La(Ⅲ) ion, and gives new complex. All variable temperature MCD spectra show the present of Faraday C term, which may be contributed by the cation radicals. This need to be further verified by EPR spectra. In addition, La(Ⅲ)-chlorophyll-a may have similar monoporphyrin structure with chlorophyll-a from their similar MCD spectra.

Key words: Chlorophyll, La(Ⅲ)-chlorophyll, MCD spectra

中图分类号:

O614.331

李赛君,张完白,高松,吴瑾光,井上秀成 . 变温磁园二色谱研究叶绿素与镧的复合物[J]. 北京大学学报（自然科学版）.

LI Saijun,ZHANG Wanbai,GAO Song,WU Jinguang,HIDENARI Inoue. Studies on Variable Temperature MCD Spectra A Complex of Chlorophyll-a and Lanthanum[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

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https://xbna.pku.edu.cn/CN/Y1996/V32/I2/182