Skhirtladze, Levani and Leitonas, Karolis and Bucinskas, Audrius and Woon, Kai Lin and Volyniuk, Dmytro and Keruckiene, Rasa and Mahmoudi, Malek and Lapkowski, Mieczyslaw and Ariffin, Azhar and Grazulevicius, Juozas (2023) Turn on of room temperature phosphorescence of donor-acceptor-donor type compounds via transformation of excited states by rigid hosts for oxygen sensing. Sensors and Actuators B-Chemical, 380. ISSN 0925-4005, DOI https://doi.org/10.1016/j.snb.2023.133295.
Full text not available from this repository.Abstract
A series of compounds with the different donor moieties (phenothiazine, phenoxazine and acridine) and 1,4-difluorobenzene unit as the acceptor were developed for optical sensors of oxygen. Among three new com-pounds, oxygen sensing ability of one compound 10,10'-(2,5-difluoro-1,4-phenylene)bis(10 H-phenothiazine) (2PS-2FPh) exhibiting strong room-temperature phosphorescence in rigid matrix Zeonex shows high sensitivity to low concentration of oxygen (<0.1%). To understand the reason of the high oxygen sensitivity of 2PS-2FPh, the effect of a rigid medium on conformational distortion was studied using a set of experimental and theoretical approaches. Doping 2PS-2FPh into Zeonex results in strong room-temperature phosphorescence in a vacuum with singlet-triplet splitting (Delta EST) widened to 0.47 eV as compared to 0.17 eV observed for the solution in 2-methyltetrahydrofuran. Molecular dynamic simulation with 2PS-2FPh doped in Zeonex indicates the increased molecular heterogeneity. Concomitantly, the hybrid local and charge transfer triplet state (3HLCT) becomes more local allowing the room temperature phosphorescence to be observed from locally excited triplet states. These results showed that conformational disorder and rigidity of the medium can significantly widen Delta EST of donor-acceptor-donor type molecules transforming 3HLCT into 3LE and thus facilitating the room -temperature phosphorescence and high oxygen sensitivity of 2PS-2FPh.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education, Malaysia [Grant No: FRGS/1/2019/STG01/UM/01/1, GPF086B-2020], European Regional Development Fund [Grant No: 01.2.2-LMT-K-718–03-0019] |
| Uncontrolled Keywords: | Room temperature phosphorescence; Hybrid local and charge transfer state; Host; Oxygen sensor |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 08 Nov 2024 03:12 |
| Last Modified: | 08 Nov 2024 03:12 |
| URI: | http://eprints.um.edu.my/id/eprint/38370 |
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