Abstract
Photophysical studies on a BODIPY-fullerene-distyryl BODIPY triad (BDP-C60-DSBDP) and its reference dyads (BODIPY-fullerene; BDP-C60 and distyryl BODIPY-fullerene; DSBDP-C60) are presented herein. In the triad, the association of the two chromophore units linked by a fullerene moiety leads to strong near UV–Visible light absorption from 300 to 700 nm. The triplet-excited state was observed upon visible excitation in all these assemblies, and shown to be localized on the C60 or BODIPY moieties. Using quantitative nanosecond transient absorption, we provide a complete investigation on the lifetime and formation quantum yield of the triplet-excited state. In the BDP-C60 dyad, the triplet excited state of C60 (τ = 7 ± 1 μs) was obtained with a quantum yield of 40 ± 8%. For the DSBDP-C60 dyad and BDP-C60-DSBDP triad, a longer-lived triplet excited state with a lifetime of around 250 ± 20 μs centered on the DSBDP moiety was formed, with respective quantum yields of 37 ± 8 and 20 ± 4%. Triplet–triplet annihilation up-conversion is characterized in the BDP-C60 dyad and the bichromophoric triad in the presence of perylene and DSBDP-monomer as respective annihilators. The photo-induced formation of a long-lived 3DSBDP* in the triad coupled with panchromatic light absorption offers potential applications as a heavy-atom-free organic triplet photosensitizer.
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Acknowledgements
This work was supported by the CNRS (International Emerging Action, PICS project no 08198), the LabEx PALM ANR-10LABX-0039-PALM and CHARMMMAT ANR-11-LABX-0039, Région Ile-de-France DIM Nano-K. Anam Fatima is grateful for the MESRI grant (2019-2022). Jad Rabah thanks the MESRI for a PhD fellowship (2017-2020).
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Conceptualization: AF, RMR, MH, TP; investigation: AF, JR, EA, HF, KW, GB, GC and MS; supervision: TP, RMR, KS and MH; writing—original draft preparation: AF, KS and MH; funding acquisition: MH, RMR and TP. All authors have read and agreed to the submitted version of the manuscript.
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Fatima, A., Rabah, J., Allard, E. et al. Selective population of triplet excited states in heavy-atom-free BODIPY-C60 based molecular assemblies. Photochem Photobiol Sci 21, 1573–1584 (2022). https://doi.org/10.1007/s43630-022-00241-z
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DOI: https://doi.org/10.1007/s43630-022-00241-z