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

作　　者：Yunfang Zhao Guangyu Gao Shufeng Wang Weijun Jin 

机构地区：[1]College of Chemistry, Beijing Normal University [2]School of Physics, Peking University

出　　处：《Chinese Science Bulletin》2014年第5期492-496,共5页

基　　金：supported by the National Natural Science Foundation of China(20875010)

摘　　要：The steady-state absorption and fluorescence emission positions of diprotonated meso-tetrakis(4-sulfonatophenyl)porphyrin(H4TPPS2-)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-in these ILs occurs on two well-separated time scales.The short components with121.2–128.6 ps arise from the local motion of the ion-pairs in close proximity to the porphine core,and the long components with 1056.6–1261.8 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.The steady-state absorption and fluorescence emission positions of diprotonated meso-tetrakis（4-sulf- onatophenyl） porphyrin （H4TPPS2 ） 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- in these ILs occurs on two well-separated time scales. The short components with 121.2-128.6 ps arise from the local motion of the ion-pairs in close proximity to the porphine core, and the long components with 1056.6-1261.8 ps are due to the collec- tive translation motions of the ion-pairs. The dynamic Stokes shifts and the relaxation times increase with the increasing cation size of the ILs.

关 键 词：离子液体 动力学过程 溶剂化 磺酸苯基 卟啉 固体 激发态 消旋 

分 类 号：O645.1[理学—物理化学]