Bag, Sayan Kumar and Mondal, Bijan and Karmakar, Manisha and Das, Subhadeep and Patra, Abhijit and Thakur, Arunabha (2024) Controlled Photooxidation via Singlet Oxygen Generation by Triplet Harvesting in a Heavy Atom Free Pure Organic Dithienylethene-Naphthalene Diimide. CHEMISTRY-A EUROPEAN JOURNAL, 30 (61): e202401562. ISSN 0947-6539, 1521-3765
Full text not available from this repository. (Request a copy)Abstract
Noninvasive control over the reversible generation of singlet oxygen (O-1(2)) has found the enormous practical implications in the field of biomedical science. However, metal-free pure organic emitters, connected with a photoswitch, capable of generating "on-demand" O-1(2) via triplet harvesting remain exceedingly rare; therefore, the utilization of these organic materials for the reversible control of singlet oxygen production remains at its infancy. Herein, an ambient triplet mediated emission in quinoline-dithienylethene (DTE)-core-substituted naphthalene diimide (cNDI) derivative is unveiled via delayed fluorescence. The quinoline-DTE-cNDI triad displayed enhanced photoswitching efficiency via double FRET mechanism. It was found to have direct utilization in controlled photosensitized organic transformations via efficient generation of singlet oxygen (yield Phi(Delta similar to)0.55 in DCM and 0.73 in methanol). The designed molecule exhibits a long-lived emission (tau similar to 1.1 mu s) and very small singlet-triplet splitting (Delta E-ST) of 0.13 eV empowering it to display delayed fluorescence. Comprehensive steady state and time-resolved emission spectroscopy (TRES) analyses along with DFT calculations offer detailed understandings into the excited-state manifolds of organic compound and energy transfer (ET) pathways involved in O-1(2) generation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ACTIVATED DELAYED FLUORESCENCE; ENERGY-TRANSFER SYSTEM; BASIS-SETS; EMISSION; ABLATION; DESIGN; CANCER; CELLS; Controlled O-1(2) generation; Delayed fluorescence; Dithienylethene; Fluorescence switching; Forster resonance energy transfer |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Manfred Scheer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Oct 2025 10:07 |
| Last Modified: | 28 Oct 2025 10:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64634 |
Actions (login required)
 |
View Item |
