Oxidation State Tuning of Room Temperature Phosphorescence and Delayed Fluorescence in Phenothiazine and Phenothiazine-5,5-dioxide Dimers.
Oxidation State Tuning of Room Temperature Phosphorescence and Delayed Fluorescence in Phenothiazine and Phenothiazine-5,5-dioxide Dimers.
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吩噻嗪和吩噻嗪-5,5-二氧化物二聚体的室温磷光和延迟荧光的氧化态调谐。
DOI：
10.1002/chem.202300428
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Wright IA
中科院分区：
文献类型：
--
作者：
Wright IA
已合成了由蝶形吩噻嗪（PTZ）及其化学氧化形式吩噻嗪-5，5-二氧化物（PTZ（SO2））的组合组成的杂环二聚体。通过邻位取代基包括甲基醚、硫化物和砜在二聚体上施加扭曲。X射线晶体学、循环伏安法和光谱学，在计算研究的支持下，已被用于研究氧化态、构象限制和发射机制之间的相互作用，包括热激活延迟荧光（TADF）和室温磷光（RTP）。虽然PTZ（SO2）二聚体是简单的荧光团，但PTZ的存在诱导了三重态介导的发射，混合的PTZ-PTZ（SO2）二聚体显示出TADF和RTP的浓度依赖性标志。
Heterocyclic dimers consisting of combinations of butterfly‐shaped phenothiazine (PTZ) and its chemically oxidized form phenothiazine‐5,5‐dioxide (PTZ(SO2)) have been synthesized. A twist is imposed across the dimers byortho‐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 thePTZ(SO2)dimers are simple fluorophores, the presence ofPTZinduces triplet‐mediated emission with a mixedPTZ‐PTZ(SO2)dimer displaying concentration dependent hallmarks of both TADF and RTP.