Oxidation State Tuning of Room Temperature Phosphorescence and Delayed Fluorescence in Phenothiazine and Phenothiazine-5,5-dioxide Dimers.

Autor: Wright IA; Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.; School of Chemistry, University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK., Etherington MK; Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK.; Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Ellison Place, Newcastle upon Tyne, NE1 8ST, UK., Batsanov AS; Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK., Monkman AP; Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK., Bryce MR; Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2023 May 26; Vol. 29 (30), pp. e202300428. Date of Electronic Publication: 2023 Apr 19.
DOI: 10.1002/chem.202300428
Abstrakt: Heterocyclic dimers consisting of combinations of butterfly-shaped phenothiazine (PTZ) and its chemically oxidized form phenothiazine-5,5-dioxide (PTZ(SO 2 )) have been synthesized. A twist is imposed across the dimers by ortho-substituents including methyl ethers, sulfides and sulfones. X-ray crystallography, cyclic voltammetry and optical spectroscopy, underpinned by computational studies, have been employed to study the interplay between the oxidation state, conformational restriction, and emission mechanisms including thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP). While the PTZ(SO 2 ) dimers are simple fluorophores, the presence of PTZ induces triplet-mediated emission with a mixed PTZ-PTZ(SO 2 ) dimer displaying concentration dependent hallmarks of both TADF and RTP.
(© 2023 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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