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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Solvent-dependent intramolecular charge transfer delocalization/localization in multibranched push-pull chromophores
Yang Li1, Meng Zhou1, Yingli Niu1
1Beijing National Laboratory for Molecular Sciences (BNLMS) and Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
Solvent polarity dictates excitation delocalization in multibranched push-pull chromophores. In less polar solvents, excitation spreads across all branches; in more polar solvents, it localizes on one branch.
Area of Science:
- Photochemistry
- Molecular Spectroscopy
- Materials Science
Background:
- Push-pull chromophores exhibit intramolecular charge transfer (ICT) properties.
- Solvent polarity significantly influences molecular electronic states and relaxation pathways.
- Multibranched chromophores offer unique architectures for tailored optical properties.
Purpose of the Study:
- To investigate the impact of solvent polarity on excitation delocalization and localization in multibranched push-pull chromophores.
- To elucidate the relationship between solvent polarity, excited-state dynamics, and chromophore symmetry.
- To explore potential applications in nonlinear optics and energy harvesting.
Main Methods:
- Steady-state absorption and fluorescence spectroscopy.
- Femtosecond transient absorption spectroscopy.
- Computational modeling of solvent reaction field effects.
Main Results:
- Excited-state relaxation is highly sensitive to solvent polarity and the degree of ICT.
- Chromophore symmetry is maintained in less polar solvents, promoting excitation delocalization.
- In polar solvents, intense solvent reaction fields break symmetry, localizing excitation on specific molecular branches.
Conclusions:
- Solvent polarity is a critical factor controlling excitation delocalization/localization in multibranched chromophores.
- Understanding these solvent-dependent phenomena is key for designing chromophores for advanced optical and energy applications.
- The findings provide fundamental insights into structure-property relationships in functional organic materials.
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