高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (6): 878.

• 论文 • 上一篇    下一篇

光敏剂亚甲蓝与不同溶剂的相互作用研究

冯喜增, 何锡文, 沈含熙   

  1. 南开大学化学系, 天津 300071
  • 收稿日期:1995-05-03 出版日期:1996-06-24 发布日期:1996-06-24
  • 通讯作者: 何锡文
  • 作者简介:冯喜增,男,32岁,博士研究生.
  • 基金资助:

    国家自然科学基金

Studies on the Interaction Between Photosensitizer Methylene Blue and Different Organic Solvents

FENG Xi-Zeng, HE Xi-Wen, SHEN Han-Xi   

  1. Department of Chemistry, Nankai University, Tianjin 300071
  • Received:1995-05-03 Online:1996-06-24 Published:1996-06-24

摘要: 应用光谱法研究了新光敏剂亚甲蓝在不同溶剂中的电子光谱特性。通过Kasha理论推测了其在不同溶剂中二聚体的分子构造模式,其二聚体的面-面间距离为1.345~1.425nm,面间角为82.9°~87.5°。确认由McRae式对亚甲蓝与不同溶剂间的相互作用方式进行评价是可行的,提出了亚甲蓝在不同溶剂中分子间力的相互结合作用是导致亚甲蓝在溶液中结构变化,产生光谱差异的原因,阐述了溶液状态与选择性分子间力的相互作用机制。

关键词: 亚甲蓝, 溶液状态, 光敏剂

Abstract: The spectrophotometric characteristics of methylene blue in different organic solvents have been studied in this paper.From application of Kasha's theory on the difference spectrum between MBmonomer and dimer, we have estimated that the distance between monomer planes of MBranges from 1.345 nm to 1.425 nm and these planes form the cross angle 82.9~87.5°in dimer molecules.In order to obtain information on the solution state of different solvents with methylene blue, interaction between different solvents and MBhave been investigated by the analysis of UV-Vis absorption spectra in terms of a modified McRas's equation.The sum of the dispersion and induction force of the MBestimated from the equation is 21.3 kJ/mol, the orientation force as 20.5 kJ/mol, the hydrogen bonding as 0.17 kJ/mol in ethanol solution.The sum of the dispersion and induction force of the MBestimated from the equation is 25.9 kJ/mol, the orientation force as 20.1 kJ/mol in dimethyl sulfoxide solution.

Key words: Methylene blue, Solution state, Photosensitizer

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