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题名: Ultrafast Investigation of Intramolecular Charge Transfer and Solvation Dynamics of Tetrahydro[5]-helicene-Based Imide Derivatives
作者: Zhu, Huaning1; Li, Meng2; Hu, Jiangpu1; Wang, Xian1; Jie, Jialong1; Guo, Qianjin1; Chen, Chuanfeng2; Xia, Andong1
刊名: SCIENTIFIC REPORTS
发表日期: 2016-04-14
卷: 6
收录类别: SCI
英文摘要: We report the excited-state intramolecular charge transfer (ICT) characteristics of four tetrahydro[ 5] helicene-based imide (THHBI) derivatives with various electron-donating substitutes in different polarity of solvents using steady-state, time-resolved transient absorption (TA) spectroscopy. It is found that, the small bathochromic-shift of the absorption spectra but large red shift of the emission spectra for all dyes with increasing solvent polarity indicates the larger dipole moment of the excited state compared to ground state. The results of theoretical calculations exhibit the charge transfer from the terminal donors to helical backbone, which accounts for the degrees of red shift of the emission spectra from different extent of ICT nature. Time-resolved TA spectra recorded as a function of electron-donating substitutes and solvent polarity show the dye with stronger donors (THHBI-PhNPh2) in more polar solvent behaves faster excited-state ICT relaxation, leading to the formation of solvent-stabilized ICT state (ICT' state) from the excited ICT state; The dyes (THHBI-Ph, THHBI-PhCF3 and THHBI-PhOMe) with relative weaker donors show weaker dependence on solvent polarity, and instead of that intersystem crossing (ISC) becomes possible from ICT state to triplet state.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35999
Appears in Collections:光化学实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, BNLMS, Key Lab Photochem, Beijing 100190, Peoples R China
2.Chinese Acad Sci, BNLMS, Key Lab Mol Recognit & Funct, Inst Chem, Beijing 100190, Peoples R China
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