Singlet fission in heterogeneous lycopene aggregates
We have prepared lycopene aggregates with low scattering in an acetone-water suspension. The aggregates exhibit highly distorted absorption, extending from the UV up to 568 nm, as a result of strong excitonic interactions. We have investigated the structural organization of these aggregates by resonance Raman and TEM, revealing that the lycopene aggregates are not homogeneous, containing at least four different aggregate species. Transient absorption measurements upon excitation at 355, 515, and 570 nm, to sub-select these different species, reveal significant differences in dynamics between each of the aggregate types. The strong excitonic interactions produce extremely distorted transient electronic signatures, which do not allow an unequivocal identification of the excited states at times shorter than 60 ps. However, these experiments demonstrate that all the lycopene aggregated species form long-living triplets via singlet fission.
Authors
- Vasyl Veremeienko
- Mikas Vengris (ORCID: https://orcid.org/0000-0003-1780-5617)
- Minh‐Huong Ha‐Thi (ORCID: https://orcid.org/0000-0003-3276-1843)
- Ana‐Andreea Arteni (ORCID: https://orcid.org/0000-0001-6462-905X)
- Bruno Robert (ORCID: https://orcid.org/0000-0001-5999-4538)
- Thomas Pino (ORCID: https://orcid.org/0000-0002-1646-7866)
- Andrew A. Pascal (ORCID: https://orcid.org/0000-0002-1844-6065)
- Manuel J. Llansola‐Portoles (ORCID: https://orcid.org/0000-0002-8065-9459)
- Roxanne Bercy
- C. Magne (ORCID: https://orcid.org/0000-0002-4156-0165)
Institutions
- Centre National de la Recherche Scientifique (FR)
- Vilnius University (LT)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- Institut de Biologie Intégrative de la Cellule (FR)
- Institut des Sciences Moléculaires d'Orsay (FR)
- CEA Paris-Saclay (FR)
Publication Details
- Journal
- Scientific Reports
- Published
- 2025-02-15
- DOI
- https://doi.org/10.1038/s41598-025-88220-z
- Citations
- 2
- Primary Topic
- Photosynthetic Processes and Mechanisms
- Type
- article
- Field-Weighted Citation Impact
- 1.61
Funders
- Agence Nationale de la Recherche
- Lietuvos Mokslo Taryba
- Centre National de la Recherche Scientifique
- French Infrastructure for Integrated Structural Biology