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Singlet fission in heterogeneous lycopene aggregates.
Chloe Magne1, Vasyl Veremeienko1, Roxanne Bercy1
1CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Université Paris-Saclay, 91190, Gif-sur-Yvette, France.
Scientific Reports
|February 15, 2025
Summary
Researchers studied lycopene aggregates, finding they contain multiple species with distinct dynamics. All species form long-lived triplets through singlet fission, a key photophysical process.
Area of Science:
- Photochemistry
- Materials Science
- Spectroscopy
Background:
- Lycopene, a carotenoid, forms aggregates with unique optical properties.
- Understanding aggregate structure and dynamics is crucial for applications.
Purpose of the Study:
- To characterize the structural heterogeneity of lycopene aggregates.
- To investigate the photophysical dynamics of different lycopene aggregate species.
- To determine the role of excitonic interactions in aggregate behavior.
Main Methods:
- Preparation of lycopene aggregates in acetone-water suspension.
- Resonance Raman spectroscopy and Transmission Electron Microscopy (TEM) for structural analysis.
- Transient absorption spectroscopy with selective excitation to probe dynamics.
Main Results:
- Lycopene aggregates are structurally heterogeneous, comprising at least four distinct species.
- Strong excitonic interactions lead to highly distorted absorption spectra.
- Selective excitation reveals significant dynamic differences among aggregate species.
- All aggregate species form long-lived triplet states via singlet fission.
Conclusions:
- Lycopene aggregation leads to complex structures with diverse photophysical properties.
- Singlet fission is a dominant pathway for triplet formation in all observed lycopene aggregate species.
- Excitonic coupling significantly influences the excited-state dynamics and spectral signatures.
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