Restriction of Photoinduced Twisted Intramolecular Charge Transfer
Qian, Yan2,3,4; Cai, Min-Min2,3,4; Xie, Ling-Hai2,3,4; Yang, Guo-Qiang1; Wu, Shi-Kang1; Huang, Wei2,3,4
Source PublicationCHEMPHYSCHEM
AbstractAn intensive investigation of structure-property relationships in the aggregation-induced enhanced emission (AIEE) of luminescent compounds is essential for the rational design of highly emissive solid-state materials. In the AIEE-active compounds N,N'-bis[3-hydroxy-4-(2'-benzothiazolyl)phenyl]isophthalamide and N,N'-bis[3-hydroxy-4-(2'-benzothiazolyl)phenyl]-5-tert-butylisophthalamide, fast photoinduced twisted intramolecular charge transfer (TICT) of the enol excited state is found to be mainly responsible for the weak emission of their dilute solutions. The photoinduced TICT enol excited state is formed with a greatly distorted configuration, due to the large rotation about the C-N single bond. This facilitates nonradiative TICT decay from the normal enol excited state to the highly twisted enol excited state, rather than proton-transfer decay to the keto excited state. In aggregates, photoinduced nonradiative deactivation of TICT is strongly prohibited, so that excited-state intramolecular proton transfer (ESIPT) becomes the dominant decay, and hence contributes greatly to the subsequent emission enhancement of the keto form. Molecular design and investigation of analogous single-armed compounds further verifies this kind of AIEE mechanism.
KeywordAggregation Benzothiazoles Charge Transfer Fluorescence Photophysics
Indexed BySCI
WOS IDWOS:000287792300023
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Cited Times:46[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYang, Guo-Qiang
Affiliation1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Key Lab Photochem, Inst Chem, Beijing 100080, Peoples R China
2.Nanjing Univ Posts & Telecommun, Key Lab Organ Elect, Nanjing, Peoples R China
3.Nanjing Univ Posts & Telecommun, Informat Displays KLOEID, Nanjing, Peoples R China
4.Nanjing Univ Posts & Telecommun, Inst Adv Mat IAM, Nanjing, Peoples R China
Recommended Citation
GB/T 7714
Qian, Yan,Cai, Min-Min,Xie, Ling-Hai,et al. Restriction of Photoinduced Twisted Intramolecular Charge Transfer[J]. CHEMPHYSCHEM,2011,12(2):397-404.
APA Qian, Yan,Cai, Min-Min,Xie, Ling-Hai,Yang, Guo-Qiang,Wu, Shi-Kang,&Huang, Wei.(2011).Restriction of Photoinduced Twisted Intramolecular Charge Transfer.CHEMPHYSCHEM,12(2),397-404.
MLA Qian, Yan,et al."Restriction of Photoinduced Twisted Intramolecular Charge Transfer".CHEMPHYSCHEM 12.2(2011):397-404.
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