Excited-state solvation dynamics of meso-tetrakis(4-sulfonatophenyl) porphyrin in solid imidazolium-sulfonate-based ionic liquids

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• 作者：Yunfang Zhao (1)
  Guangyu Gao (2)
  Shufeng Wang (2)
  Weijun Jin (1)
  
• 关键词：Solvation dynamics ; Meso ; tetrakis(4 ; sulfonatophenyl) porphyrin ; Ionic liquids ; Streak camera
• 刊名：Chinese Science Bulletin
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：59
• 期：5-6
• 页码：492-496
• 全文大小：1,019 KB
• 作者单位：Yunfang Zhao (1)
  Guangyu Gao (2)
  Shufeng Wang (2)
  Weijun Jin (1)
  
  1. College of Chemistry, Beijing Normal University, Beijing, 100875, China
  2. School of Physics, Peking University, Beijing, 100871, China
  
• ISSN：1861-9541

文摘

The steady-state absorption and fluorescence emission positions of diprotonated meso-tetrakis(4-sulfonatophenyl) porphyrin (H4TPPS2?/sup>) are dependent on the polarity of the selected two solid ionic liquids (ILs) and are red-shifted with the increase of cation size. The solvation dynamics process of H4TPPS2?/sup> in these ILs occurs on two well-separated time scales. The short components with 121.2-28.6?ps arise from the local motion of the ion-pairs in close proximity to the porphine core, and the long components with 1056.6-261.8?ps are due to the collective translation motions of the ion-pairs. The dynamic Stokes shifts and the relaxation times increase with the increasing cation size of the ILs.