波谱学杂志 ›› 1999, Vol. 16 ›› Issue (1): 52-57.

• 研究论文 • 上一篇    下一篇

VO(Ⅱ)-蛋氨酸-邻菲咯啉配合物的结构与波谱

陈德余, 张平, 王国平, 徐元植   

  1. 浙江大学化学系, 杭州 310027
  • 收稿日期:1998-08-24 修回日期:1998-10-16 出版日期:1999-02-05 发布日期:2018-01-11
  • 作者简介:陈德余,男,1938年出生,教授
  • 基金资助:
    浙江省自然科学基金(297005)资助项目

STRUCTURES AND SPECTRA OF VO(Ⅱ)-MET-PHEN COMPLEXES

Chen Deyu, Zhang Ping, Wang Guoping, Xu Yuanzhi   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027
  • Received:1998-08-24 Revised:1998-10-16 Online:1999-02-05 Published:2018-01-11

摘要: 测定了VOSO4与蛋氨酸(Met)及VOSO4与蛋氨酸、邻菲咯啉(Phen)在不同酸度(pH=1~14)的乙二醇/水(1:1)溶液中的低温EPR波谱,发现在不同pH下生成不同组成、结构的配合物,利用Johnson加合规则并结合IR,推测了不同pH下生成配合物的可能结构.根据EPR波谱参数计算了配合物的键参数,得出随溶液pH值增大,氨基酸取代的水分子数增多,生成配合物的δ2值下降,即共价键成份增加.利用电子光谱数据计算了配合物的晶体场参数,讨论了成配规律,得出Phen与VO (Ⅱ)配位能力比Met强得多.

关键词: 蛋氨酸, 邻菲咯啉, VO(Ⅱ)配合物, EPR, 晶体场参数

Abstract: EPR spectra of VO-Met and VO-Met Phen systems in glycol and water (1:1) solution at various acidities have been observed at low temperature. It was found that in different pH ranges different structural complexes were formed. According to Johnson's rule and IR, their possible structures were suggested. The bonding parameters of complexes were calculated by EPR parameters. It can be seen that the δ2 of complexes decrease as the number of ligands bound to vanadium increase. This means that the covalent bonding between vanadium and ligands increase as amino acid ligands replace water ligands. Using electronic spectral data, the crystal field parameters were calculated. The coordination law was discussed. It was obtained that the coordination capacity of phen is much stronger than one of Met.

Key words: Methionine, Phenanthroline, VO(Ⅱ) complex, EPR, Crystal field parameter