Intramolecular benzene excimer formation in 13,14-diphenyldibenzo[b,j][4,7]phenanthroline

13,14-diphenyldibenzo[b,j][4,7]phenanthroline (DBP3) in various solvents was studied by time-resolved fluorescence and fs transient absorption (fs-TA) spectroscopy. An intramolecular benzene excimer is demonstrated to form within DBP3; it exhibits strong redshifted emission with maximum at 540-640 nm. "Intrinsic" fluorescence from DBP3 is dramatically quenched down to τ = 50-400 fs in all the solvents studied. Fs-TA and time-resolved fluorescence spectra have proved that relaxed intramolecular benzene excimer is formed from S1 state via hot excimer state with three lifetime components: 50 fs, ∼3.5 ps, and ∼25 ps, which are of the inertial (electronic) and diffusive parts of the relaxation due to solute-solvent interaction. Formation of triplet states via intersystem crossing was observed directly from the upper excited electronic states of DBP3.

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Publication Details

Journal
The Journal of Chemical Physics
Published
2024-10-14
DOI
https://doi.org/10.1063/5.0227468
Citations
4
Primary Topic
Photochemistry and Electron Transfer Studies
Type
article
Field-Weighted Citation Impact
1.78

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article

Intramolecular benzene excimer formation in 13,14-diphenyldibenzo[b,j][4,7]phenanthroline

Yilun Zhao, Gagik G. Gurzadyan, Licheng Sun, Junxiu Lin et al.
4 citations
The Journal of Chemical Physics
Photochemistry and Electron Transfer Studies
1.78
article

Intramolecular benzene excimer formation in 13,14-diphenyldibenzo[b,j][4,7]phenanthroline

Yilun Zhao, Gagik G. Gurzadyan, Licheng Sun, Junxiu Lin, Xiaojun Peng, Andrew C. Grimsdale, Lin Ma, Tianjiao Li, Animesh Ghosh, Saran Long
article en
4 citations

Abstract

13,14-diphenyldibenzo[b,j][4,7]phenanthroline (DBP3) in various solvents was studied by time-resolved fluorescence and fs transient absorption (fs-TA) spectroscopy. An intramolecular benzene excimer is demonstrated to form within DBP3; it exhibits strong redshifted emission with maximum at 540-640 nm. "Intrinsic" fluorescence from DBP3 is dramatically quenched down to τ = 50-400 fs in all the solvents studied. Fs-TA and time-resolved fluorescence spectra have proved that relaxed intramolecular benzene excimer is formed from S1 state via hot excimer state with three lifetime components: 50 fs, ∼3.5 ps, and ∼25 ps, which are of the inertial (electronic) and diffusive parts of the relaxation due to solute-solvent interaction. Formation of triplet states via intersystem crossing was observed directly from the upper excited electronic states of DBP3.

The Journal of Chemical PhysicsVol. 161(14)
Guangdong University of Technology (CN), Nanyang Technological University (SG), Shenzhen University (CN), Dalian University of Technology (CN), Westlake University (CN), Dalian University (CN), Smart Material (Germany) (DE), KTH Royal Institute of Technology (SE)
Ministry of Education - Singapore, National Natural Science Foundation of China, Dalian University of Technology
Clean water and sanitation
Openalex Percentile: Top 13%
Photochemistry and Electron Transfer Studies
1.78
DOISourceOpenAlex
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Intramolecular benzene excimer formation in 13,14-diphenyldibenzo[b,j][4,7]phenanthroline — Yilun Zhao, Gagik G. Gurzadyan, et al. · The Journal of Chemical Physics (2024) | TGRS Research Map | TGRS