Turn off MathJax
Article Contents
Lin Chen, Yuan-ming Li, Min Zheng, Xin Wei, Lin Wang. pH Dependence of Photochemical Kinetics of Thioxanthen-9-one from Nanosecond Time-resolved Laser Flash Photolysis[J]. Chinese Journal of Chemical Physics .
Citation: Lin Chen, Yuan-ming Li, Min Zheng, Xin Wei, Lin Wang. pH Dependence of Photochemical Kinetics of Thioxanthen-9-one from Nanosecond Time-resolved Laser Flash Photolysis[J]. Chinese Journal of Chemical Physics .

pH Dependence of Photochemical Kinetics of Thioxanthen-9-one from Nanosecond Time-resolved Laser Flash Photolysis

  • Received Date: 2021-04-01
  • Accepted Date: 2021-05-14
  • Rev Recd Date: 2021-05-10
  • Available Online: 2021-05-27
  • pH dependent fluorescence emission of a thioxanthone-based probe has been reported recently. To reveal potential determinant factors of this pH dependence can provide important clues to design novel thioxanthone-based probe in the future. Thus, pH dependence on photochemical kinetics of thioxanthone itself was investigated in this work, using nanosecond time-resolved laser flash photolysis. The nanosecond time-resolved transient absorption spectra and kinetics of TX in aqueous acetonitrile were recorded, as well as for a model reaction system including TX and diphenylamine (DPA) as co-initiators. Besides the well-known absorption peaks of <sup>3</sup>TX<sup>*</sup>, the other peaks at 417, 518, 673 and 780 nm, have been reliably attributed to major intermediates in the overall reaction between TX and DPA with photolysis, which has been confirmed to occur along a multistep process. In the strong acidic solution (pH ~3.0), TX and TXH<sup>+</sup> coexist due to protonated equilibrium. Consequently, high proton concentration promotes the predominant decay pathway after photolysis from electron transfer to proton affinity. Subsequently, the different primary products, <sup>3</sup>TXH<sup>+*</sup> or TX<sup>•−</sup>, proceed different secondary reaction channels. In addition, within the wide pH range from weak acid (pH 5.0) to alkaline solution (pH 13.0), the overall reaction mechanism and rates do not show visible changes.

     

  • loading
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Article Metrics

    Article views (82) PDF downloads(13) Cited by()
    Proportional views
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return