Hindered Intramolecular Electron Transfer in Room-Temperature Ionic Liquid

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• 作者：Haixia Wu ; Haixia Wang ; Lin Xue ; Yan Shi ; Xiyou Li
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：November 18, 2010
• 年：2010
• 卷：114
• 期：45
• 页码：14420-14425
• 全文大小：266K
• 年卷期：v.114,no.45(November 18, 2010)
• ISSN：1520-5207

文摘

Three perylene tetracarboxylic diimide (PDI) compounds, namely, N,N′- di(2-N′′,N′′-dimethylamino)ethylperylene-3,4:9,10-tetracarboxylic diimide (1), N,N′-di(2-N′′,N′′-dimethylamino)propylperylene-3,4:9,10-tetracarboxylic diimide (2), and N,N′- dicyclohexyl-1,7-pyrrolidinylperylene-3,4:9,10-tetracarboxylic diimide (3), have been desgined and prepared. Their photophyscial properties in room-temperature ionic liquid (RTILs) were studied by steady-state absorption and emission spectra and fluorescence lifetime measurements. The intramolecular photoinduced electron transfer from dimethylamine to PDI in 1 and 2 has been efficiently hindered because of the solvation of RTILs. A two-conformation mechanism for the PET in 1 and 2 is proposed, which explains the results of the fluorescence lifetime measurements well. The solvation of RTILs to 3 resembled that of a normal polar organic solvent with polarity larger than that of DMF.