高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (11): 2431.doi: 10.7503/cjcu20140312

• 物理化学 • 上一篇    下一篇

亚甲基蓝溶液中分子二聚现象的压致增强研究

王凯1, 齐广宇1, 蒋章妹1, 林奥雷2()   

  1. 1.吉林大学超硬材料国家重点实验室, 2. 先进技术研究院, 长春 130012
  • 收稿日期:2014-04-04 出版日期:2014-11-10 发布日期:2014-10-20
  • 作者简介:联系人简介: 林奥雷, 男, 博士, 教授, 主要从事高压物理与化学研究. E-mail:linal@jlu.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 11204101)和博士后科学基金(批准号: 2012M511327)资助

High Pressure-enhanced Dimeric Aggregation in Methylene Blue Solution

WANG Kai1, QI Guangyu1, JIANG Zhangmei1, LIN Aolei2,*()   

  1. 1. State Key Laboratory of Superhard Materials, 2. Institute of Advanced Technology,Jilin University, Changchun 130012, China
  • Received:2014-04-04 Online:2014-11-10 Published:2014-10-20
  • Contact: LIN Aolei E-mail:linal@jlu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.11204101) and the China Postdoctoral Science Foundation(No.2012M511327)

摘要:

通过原位高压紫外-可见吸收光谱研究了2种溶剂(水溶液和体积比为4:1的甲醇-乙醇混合溶液)中亚甲基蓝(MB)分子聚集平衡状态的变化. 采用金刚石对顶砧原位高压实验装置, 在不同压力下测量亚甲基蓝溶液的吸收光谱, 最高实验压力分别达到0.8 GPa(水溶液)和8.7 GPa(甲醇-乙醇溶液). 结果表明, 随着压力的上升, 亚甲基蓝溶液中单体分子和二聚体的吸收峰强度比不断下降, 说明高压可以促进二聚体的形成, 使亚甲基蓝溶液中分子的单体-二聚体动态平衡过程向二聚体方向移动. 卸压后, 亚甲基蓝溶液吸收光谱的强度降低, 但吸收峰的强度比及峰位恢复到加压前的状态, 表明高压下分子聚集平衡状态的变化是可逆的.

关键词: 亚甲基蓝, 金刚石对顶砧, 吸收光谱, 高压

Abstract:

The monomer-dimer equilibrium of methylene blue(MB) in two different solvents[deionized water and 4:1(volume ratio) methanol-ethanol] was studied by in situ high pressure UV-Vis absorption spectroscopy. Using diamond anvil cell, the highest pressure conducted in the experiments was about 0.8 GPa in water and 8.7 GPa in methanol-ethanol solvent. The absorbance ratio of monomer to dimer decreased with the increase of pressure, indicating that high pressure can promote dimerization of MB. On release of pressure, the intensity of the peak did not return to original state, but the absorbance ratio of monomer to dimer returned to the initial value, showing that the changes of the absorption spectra under high pressure are reversible.

Key words: Methylene blue, Diamond anvil cell, Absorption spectrum, High pressure

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