物理化学学报 >> 1991, Vol. 7 >> Issue (01): 87 -91 .doi: 10.3866/PKU.WHXB19910114

研究论文 上一篇    下一篇

吩噻嗪和吩噁嗪氧化中间体的共振喇曼光谱研究

孙凯; 徐广智   

  1. 动态与稳态结构国家开放实验室,中国科学院化学研究所,北京
  • 收稿日期:1989-09-04 修回日期:1990-06-15 发布日期:1991-02-15
  • 通讯作者: 徐广智

Resonance Raman Spectra of Intermediates in Oxidation of Phenothiazine and Phenoxazine

Sun Kai; Xu Guang-Zhi   

  1. National Laboratory of Structural Chemsitry of Unstable and Stable Species, Institute of Chemistry, Academia Sinica, Beijing
  • Received:1989-09-04 Revised:1990-06-15 Published:1991-02-15
  • Contact: Xu Guang-Zhi

摘要: 本文对吩噻嗪和吩噁嗪的单电子氧化产生的两种氧化态的亚稳态正离子进行了共振喇曼光谱研究。随着吩噻嗪的p电子逐步失去, 结构变形振动δ_(CNC)和δ_(CSC)的喇曼频移显著地增大, 环C=C伸缩振动区域的喇曼峰数目明显变多。由此推断, 随着吩噻嗪正离子氧化态的增高, 正离子转变成平面共轭结构。

关键词: 吩噻嗪, 吩噁嗪, 共振喇曼光谱

Abstract: The resonance Raman spectra of phenothiazine radical cation, phenothiazine dication and phenoxazine dication have been recorded, which have been formed by chemical oxidation of their parent compounds with Br_2 or Pb(Ac)_4. The bands of CNC and CSC skeletal deformations show the most enhancement and large positive shifts from the corresponding parent after one or two electrons are subtracted from phenothiazine. The number of bands in ring C=C stretching frequency range are increased obviously in the spectrum of phenothiazine dication. The spectral data reveal that the degree of fold along the S—N axis vanishes and a greater aromatic resonance structure comes into being with the loss of two electrons in phenothiazine. The spectrum of phenoxazine dication is more similar to that of its parent, which shows that the loss of electrons in phenoxazine leads to less structureal change compared with phenothiazine.

Key words: Phenoxazine, Phenothiazine, Resonance Raman spectra