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• W4385651500 abstract "Bodipy (BDP)-perylenebisimide (PBI) donor-acceptor dyads/triad were prepared to study the spin-orbit charge-transfer intersystem crossing (SOCT-ISC). For BDP-PBI-3, in which BDP was attached at the imide position of PBI, higher singlet oxygen quantum yield (ΦΔ =85 %) was observed than the bay-substituted derivative BDP-PBI-1 (ΦΔ =30 %). Femtosecond transient absorption spectra indicate slow Förster resonance energy transfer (FRET; 40.4 ps) and charge separation (CS; 1.55 ns) in BDP-PBI-3, while for BDP-PBI-1, CS takes 2.8 ps. For triad BDP-PBI-2, ultrafast FRET (149 fs) and CS (4.7 ps) process were observed, the subsequent charge recombination (CR) takes 5.8 ns and long-lived 3 PBI* (179.8 μs) state is populated. Nanosecond transient absorption spectra of BDP-PBI-3 show that the CR gives upper triplet excited state (3 BDP*) and subsequently, via a slow intramolecular triplet energy transfer (14.5 μs), the 3 PBI* state is finally populated, indicating that upper triplet state is involved in SOCT-ISC. Time-resolved electron paramagnetic resonance spectroscopy revealed that both radical pair ISC (RP ISC) and SOCT-ISC contribute to the ISC. A rare electron spin polarization of (e, e, e, e, e, e) was observed for the triplet state formed via the RP ISC mechanism, due to the S-T+1 /T0 states mixing." @default.
• W4385651500 created "2023-08-09" @default.
• W4385651500 creator A5005871523 @default.
• W4385651500 creator A5007982185 @default.
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• W4385651500 creator A5062854810 @default.
• W4385651500 creator A5066874352 @default.
• W4385651500 creator A5070347573 @default.
• W4385651500 date "2023-09-25" @default.
• W4385651500 modified "2023-10-18" @default.
• W4385651500 title "Efficient Spin Orbit Charge Transfer Intersystem Crossing and Slow Intramolecular Triplet‐Triplet Energy Transfer in Bodipy‐Perylenebisimide Compact Dyads and Triads" @default.
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