Sequential Multistep Excited‐State Structural Transformations in N,N′‐Diphenyl‐dihydrodibenzophenazine Fluorophores

We demonstrate that a single polycyclic π‐scaffold can undergo sequential multistep excited‐state structural evolution along the bent, planar, and twisted conformers, which coexist to produce intrinsic multiple fluorescence emissions in room‐temperature solution. By installing a methyl or trifluorom...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-07, Vol.62 (29)
Main Authors: Jin, Xin, Guo, Shiyan, Wang, Xueli, Cong, Muyu, Chen, Jinquan, Zhang, Zhiyun, Su, Jianhua, Da‐Hui Qu, He, Tian
Format: Article
Language:English
Subjects:
Broadband
Chemical compounds
Emissions
Evolution
Fluorescence
Fluorophores
Molecular weight
Potential energy
Spectroscopy
Steric effects
Steric hindrance
Substitutes
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Summary:We demonstrate that a single polycyclic π‐scaffold can undergo sequential multistep excited‐state structural evolution along the bent, planar, and twisted conformers, which coexist to produce intrinsic multiple fluorescence emissions in room‐temperature solution. By installing a methyl or trifluoromethyl group on the ortho‐site of N,N′‐diphenyl‐dihydrodibenzo[a,c]phenazine (DPAC), the enhanced steric effects change the fluorescence emission of DPAC from a dominant red band to well‐resolved triple bands. The ultra‐broadband triple emissions of ortho‐substituted DPACs range from ≈350 to ≈850 nm, which is unprecedented for small fluorophores with molecular weight of
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202305572