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

Iain A. Wright*, Marc K. Etherington, Andrei S. Batsanov, Andrew P. Monkman, Martin R. Bryce

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
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Heterocyclic dimers consisting of combinations of butterfly-shaped phenothiazine (PTZ) and its chemically oxidized form phenothiazine-5,5-dioxide (PTZSO2) 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 PTZSO2 dimers are simple fluorophores, the presence of PTZ induces triplet-mediated emission with a mixed PTZ-PTZSO2 dimer displaying concentration dependent hallmarks of both TADF and RTP.
Original languageEnglish
Article numbere202300428
Pages (from-to)1-11
Number of pages11
JournalChemistry - A European Journal
Issue number30
Early online date19 Apr 2023
Publication statusPublished - 26 May 2023

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