Chen, Xi and Sukhanov, Andrey A. and Taddei, Maria and Dick, Bernhard and Zhao, Jianzhang and Voronkova, Violeta K. and Di Donato, Mariangela (2022) Charge Separation/Recombination, Intersystem Crossing, and Unusually Slow Intramolecular Triplet-Triplet Energy Transfer in Naphthalenediimide-Anthracene Compact Energy Donor-Acceptor Dyads. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 13 (37). pp. 8740-8748. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
Three anthracene (An)-naphthalenediimide (NDI) compact electron donor-acceptor dyads were prepared. Femtosecond transient absorption (fs-TA) spectra show fast charge separation (ca. 0.9-1.7 ps) and relatively slow charge recombination (ca. 8-565 ps) upon photoexcitation; moreover, the (3)An state was observed for 9-An-NDI, whereas the final state is (NDI)-N-3 for both 9-An-Ph-NDI and 2-An-Ph-NDI, which have an intervening phenyl linker between the An and NDI units. Nanosecond transient absorption (ns-TA) spectra indicate that the lowest triplet state of all the dyads is (3)An, with triplet lifetimes of 139-354 mu s. An unusually slow intramolecular triplet-triplet energy transfer (TTET) was observed for 9-An-Ph-NDI and 2-An-Ph-NDI (32-85 ns). Time-resolved electron paramagnetic resonance (TREPR) spectroscopy confirms that the intersystem crossing (ISC) mechanism is spin orbit charge transfer ISC (SOCT-ISC) for all the dyads; for 9-An-NDI, only the (3)An state was observed, while for the other two dyads, both (NDI)-N-3 and (3)An states were observed, with their relative population changing with increasing delay time, which supports TTET.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TIME-RESOLVED EPR; RADICAL-ION PAIRS; EXCITED-STATE; ELECTRON-DONOR; PHOTOSENSITIZERS; DERIVATIVES; SINGLET; SENSITIZATION; SEPARATION; DEPENDENCE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Feb 2024 07:42 |
| Last Modified: | 01 Feb 2024 07:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/58509 |
Actions (login required)
 |
View Item |
