Wang, Zhijia and Sukhanov, Andrey A. and Toffoletti, Antonio and Sadiq, Farhan and Zhao, Jianzhang and Barbon, Antonio and Voronkova, Violeta K. and Dick, Bernhard (2019) Insights into the Efficient Intersystem Crossing of Bodipy-Anthracene Compact Dyads with Steady-State and Time-Resolved Optical/Magnetic Spectroscopies and Observation of the Delayed Fluorescence. JOURNAL OF PHYSICAL CHEMISTRY C, 123 (1). pp. 265-274. ISSN 1932-7447,
Full text not available from this repository. (Request a copy)Abstract
Spin-orbit charge transfer-induced intersystem crossing (SOCT-ISC) is of particular interest for preparation of heavy atom-free triplet photosensitizers. Up to now, examples for SOCT-ISC dyads are limited and electron donor/acceptor SOCT-ISC dyads showing strong visible-light harvesting are rare. Herein, we studied the photophysics of a series of Bodipy-anthracene (BDP-An) compact dyads, especially the triplet state electron spin dynamics with the time-resolved electron paramagnetic resonance (TREPR) spectroscopy. The electronic coupling matrix elements (V-DA*) between the (CT)-C-1 (charge transfer) state and (LE)-L-1 (locally excited) state are in the range 773-1545 cm(-1). For one dyad, we observed three triplet states simultaneously with TREPR, that is triplet states confined on the anthracene ((3)An) and the Bodipy ((BDP)-B-3) moieties as well as a (CT)-C-3 state. Based on the electron spin polarization of these three triplet states and the optical experiments, the SOCT-ISC mechanism is confirmed and the radical pair-ISC mechanism as the main ISC channel was excluded. Triplet-triplet annihilation-induced delayed fluorescence was observed for the dyads, which is rare for Bodipy fluorophores.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRIPLET-TRIPLET ANNIHILATION; PHOTOINDUCED ELECTRON-TRANSFER; PHOTON UP-CONVERSION; INTRAMOLECULAR CHARGE-TRANSFER; RADICAL-ION PAIRS; SINGLET OXYGEN; SPIN POLARIZATION; RATIONAL DESIGN; LOW-POWER; PHOTOSENSITIZERS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Bernhard Dick |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Apr 2020 08:24 |
| Last Modified: | 27 Apr 2020 08:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27730 |
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