Efficient Room-Temperature Phosphorescence from Discrete Molecules Based on Thianthrene Derivatives for Oxygen Sensing and Detection

Frontiers in Chemistry

Chemistry

Meng Liu¹  Zhiqiang Yang¹  Shuaiqiang Zhao¹  Xiangyu Zhang¹  Bing Yang²  Haichao Liu³ 

[1] State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, China;null;[e-mail];

关键词: pure organic room-temperature phosphorescence;    discrete molecule;    thianthrene;    ratiometric optical oxygen sensing;    polymer film;    folding geometry;    spin-orbit coupling;   

DOI  :  10.3389/fchem.2021.810304

 received in 2021-11-06, accepted in 2021-12-15,  发布年份 2022

来源: Frontiers

【 摘 要 】

In this work, two thianthrene (TA) derivatives, 1-phenylthianthrene (TA1P) and 2-phenylthianthrene (TA2P), were synthesized with single-phenyl modification for pure organic discrete-molecule room-temperature phosphorescence (RTP). They both show the dual emission of fluorescence and RTP in amorphous polymer matrix after deoxygenation, as a result of a new mechanism of folding-induced spin-orbit coupling (SOC) enhancement. Compared with TA1P, TA2P exhibits a higher RTP efficiency and a larger spectral separation between fluorescence and RTP, which is ascribed to the substituent effect of TA at the 2-position. With decreasing oxygen concentration from 1.61% to 0%, the discrete-molecule TA2P shows an about 18-fold increase in RTP intensity and an almost constant fluorescence intensity, which can make TA2P as a self-reference ratiometric optical oxygen sensing probe at low oxygen concentrations. The oxygen quenching constant (KSV) of TA2P is estimated as high as 10.22 KPa−1 for polymethyl methacrylate (PMMA)-doped film, and even reach up to 111.86 KPa−1 for Zeonex®-doped film, which demonstrates a very high sensitivity in oxygen sensing and detection. This work provides a new idea to design pure organic discrete-molecule RTP materials with high efficiency, and TA derivatives show a potential to be applied in quantitative detection of oxygen as a new-generation optical oxygen-sensing material.

【 授权许可】

Unknown   
Copyright © 2022 Yang, Zhao, Zhang, Liu, Liu and Yang.