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- Title
Ultrafast time-resolved spectroscopy elucidating photo-driven electron and energy transfer processes in a broadband light-absorbing BODIPY-C<sub>60</sub>-distyryl BODIPY triad.
- Authors
Fatima, A.; Rabah, J.; Allard, E.; Fensterbank, H.; Wright, K.; Burdzinski, G.; Miomandre, F.; Pham, J.; Clavier, G.; Sliwa, M.; Pino, T.; Méallet-Renault, R.; Steenkeste, K.; Ha-Thi, M. H.
- Abstract
Photoinduced electron and energy transfer pathways are elucidated in a panchromatic light-absorbing, covalently linked triad (BODIPY-C60-distyryl BODIPY, noted as BDP-C60-DSBDP) along with the two reference dyads: BODIPY-C60 (BDP-C60) and distyryl-BODIPY-C60 (DSBDP-C60). The flexible linker between the BODIPY and C60 units leads to different possible conformations with varying donor–acceptor distances. Ultrafast transient absorption along with the time-resolved emission spectroscopies revealed the occurrence of different photoinduced electron/energy transfer processes in these conformers. Photoexcitation of the BODIPY units in the two reference dyads leads to one electron and two energy transfer steps from BODIPY to C60. However, in the BDP-C60-DSBDP triad, additional energy transfer processes from BDP to DSBDP were evidenced upon photoexcitation of the BDP unit. The singlet excited state of DSBDP in the triad then follows the same relaxation route as that of the DSBDP-C60 dyad. The intricate photophysics, particularly the formation of radical ion pairs in these flexible covalently linked donor–acceptor systems contribute to our fundamental understanding of electron and energy transfer mechanisms, which is important to build donor–acceptor assemblies for energy applications.
- Subjects
ENERGY transfer; CHARGE exchange; STAINS &; staining (Microscopy); TIME-resolved spectroscopy; ELECTRON donors; PHOTOINDUCED electron transfer; FLUORESCENCE resonance energy transfer; RADICAL ions
- Publication
European Physical Journal: Special Topics, 2023, Vol 232, Issue 13, p2131
- ISSN
1951-6355
- Publication type
Article
- DOI
10.1140/epjs/s11734-022-00670-y