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Intramolecular charge transfer and solvation dynamics of push-pull dyes with different pi-conjugated linkers
Niu, Xinmiao; Gautam, Prabhat; Kuang, Zhuoran; Yu, Craig P.; Guo, Yuanyuan; Song, Hongwei; Guo, Qianjin; Chan, Julian M. W.; Xia, Andong
2019-08-21
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
Volume21Issue:31Pages:17323-17331
AbstractThe solvation-dependent excited state dynamics of two push-pull fluorophores with donor-pi-acceptor (D-pi-A) structures were investigated using steady-state and ultrafast transient absorption (TA) spectroscopy, backed by theoretical calculations. Identical D and A groups were present in both dyes, which differed only in the structure of their central pi-conjugated linkers. Dye 1 features a p-phenylenediethynyl linker, while dye 2 contains a 2,5-diethynylthiophene linker. From the steady-state spectra, no appreciable shifts in absorption bands were observed, whereas large red-shifts in emission were seen with increasing solvent polarity, which indicated that the excited states were more polar than the ground state. Theoretical calculations support charge transfer from the triphenylamine (TPA) donor to the pentafluorosulfanyl (SF5) acceptor via pi-conjugated linkers to form an intramolecular charge transfer (ICT) state. TA spectra revealed that a solvation-stabilized conformationally relaxed intramolecular charge transfer (ICT ') state was formed in polar solvents, but only an ICT state was observed in nonpolar solvent. The SE band was quenched within 1 ps in high-polarity solvent, which corresponds to the low fluorescence quantum yield. It can be concluded that the dye with the p-phenylenediethynyl pi-linker (i.e., dye 1) exhibits a larger degree of ICT than the thiophene analogue (i.e., dye 2). These findings demonstrate how solvation can fine-tune the photophysical properties of push-pull dyes, and this study highlights the importance of pi-conjugated linkers in the excited state ICT process.
DOI10.1039/c9cp02559f
Indexed BySCI
Language英语
WOS IDWOS:000479245800039
EI Accession Number1463-9084
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82649
Collection中国科学院化学研究所
AffiliationChinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Niu, Xinmiao,Gautam, Prabhat,Kuang, Zhuoran,et al. Intramolecular charge transfer and solvation dynamics of push-pull dyes with different pi-conjugated linkers[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2019,21(31):17323-17331.
APA Niu, Xinmiao.,Gautam, Prabhat.,Kuang, Zhuoran.,Yu, Craig P..,Guo, Yuanyuan.,...&Xia, Andong.(2019).Intramolecular charge transfer and solvation dynamics of push-pull dyes with different pi-conjugated linkers.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,21(31),17323-17331.
MLA Niu, Xinmiao,et al."Intramolecular charge transfer and solvation dynamics of push-pull dyes with different pi-conjugated linkers".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 21.31(2019):17323-17331.
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