Ultrafast time-resolved spectroscopy elucidating photo-driven electron and energy transfer processes in a broadband light-absorbing BODIPY-C60-distyryl BODIPY triad - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The European Physical Journal. Special Topics Année : 2023

Ultrafast time-resolved spectroscopy elucidating photo-driven electron and energy transfer processes in a broadband light-absorbing BODIPY-C60-distyryl BODIPY triad

Anam Fatima
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Jad Rabah
Emmanuel Allard
Hélène Fensterbank
Karen Wright
Thomas Pino

Résumé

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.

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Chimie
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Dates et versions

hal-03840392 , version 1 (10-11-2023)

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Anam Fatima, Jad Rabah, Emmanuel Allard, Hélène Fensterbank, Karen Wright, et al.. Ultrafast time-resolved spectroscopy elucidating photo-driven electron and energy transfer processes in a broadband light-absorbing BODIPY-C60-distyryl BODIPY triad. The European Physical Journal. Special Topics, 2023, 232, pp.2131-2144. ⟨10.1140/epjs/s11734-022-00670-y⟩. ⟨hal-03840392⟩
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