期刊
CHEMPHOTOCHEM
卷 5, 期 4, 页码 335-347出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cptc.202000250
关键词
dibenzophenazine; excited states; quantum chemistry; time-resolved spectroscopy; transient absorption
资金
- EU's Horizon 2020 OCTA project [778158]
- Deutsche Forschungsgemeinschaft [396890929/GRK 2482]
- Strategic Research Fund of the HHU Dusseldorf
- JSPS KAKENHI from the MEXT (Ministry of Education, Culture, Science and Technology, Japan) [JP15H00997, JP17H05155, JP19H05716]
- Japan Prize Foundation
- Asahi Glass Foundation
- Research Grant in the Natural Science from the Mitsubishi Foundation
- Deutsche Forschungsgemeinschaft (DFG) [INST 208/704-1 FUGG]
- Projekt DEAL
The photophysics of dibenzo[a,j]phenazine (DBPHZ) in solution was studied using steady-state and time-resolved spectroscopy. The solvent nature has a weak effect on the photophysical properties. The first excited singlet state has a lifetime of around 1 ns, fluorescence emission at 420 nm with a yield of about 0.1, and the lowest triplet state is populated with a yield of about 0.3. Quantum chemical computations suggest that an energetically close 3n pi* state is responsible for efficient intersystem crossing towards the triplet manifold.
The photophysics of dibenzo[a,j]phenazine (DBPHZ) in solution was investigated by steady-state and time-resolved spectroscopy. The nature of the solvent (methanol, acetonitrile, dichloromethane and cyclohexane were considered) only weakly affects the photophysical properties. The first excited singlet state features a lifetime of the order of 1 ns. Its fluorescence emission is centered around 420 nm and occurs with moderate yields of approximate to 0.1. The lowest triplet state is populated with yields of approximate to 0.3. Quantum chemical computations suggest that a 3n pi* state energetically close to the primarily excited singlet state is responsible for the efficient intersystem crossing towards the triplet manifold.
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