天青
共轭体系
质子化
聚合物
光化学
电子顺磁共振
化学
材料科学
高分子化学
有机化学
物理
核磁共振
离子
作者
Bin Hou,Jing Li,Zhuofan Zhou,Wen Liang Tan,Xiaodi Yang,Jianwei Zhang,Christopher R. McNeill,Congwu Ge,Jingtao Wang,Xike Gao
出处
期刊:ACS materials letters
[American Chemical Society]
日期:2022-01-21
卷期号:4 (2): 392-400
被引量:13
标识
DOI:10.1021/acsmaterialslett.1c00767
摘要
The 2,6-azulene unit is one of the most promising moieties for constructing organic conjugated materials. Herein, we reported the design and synthesis of 2,6-azulene-based conjugated copolymers P(AzIDT-C6), P(AzIDT-PhC6), and P(AzIDTT-PhC6) containing electron-rich indacenodithiophene (IDT) units. Because of the electron-rich features of IDT moieties, all polymers can be easily protonated in both solution and solid state. The protonation states can reach saturation with as little as 0.5% volume ratio of trifluoroacetic acid in solution accompanied by a substantial red-shift (>250 nm) in the UV–vis–NIR absorption spectra, which is the most sensitive proton responsiveness among reported azulene-based polymers. The proton responsiveness of these polymers in thin films is shown to be dynamically reversible with the color changing between deep blue (neutral state) and colorless (protonated state) due to shifting of the absorption bands between the visible and near-infrared regions. Electron paramagnetic resonance experiments reveal that the protonated polymers can be further oxidized to form radical cations with strong EPR signals. A membrane containing 3 wt % P(AzIDTT-PhC6) in Nafion shows a 72.2% higher conductivity than Nafion at 125 °C and 0% relative humidity, implying the potential application of these polymers in polymer electrolyte membranes. Preliminary organic field-effect transistor studies suggest that all conjugated polymers investigated display typical p-channel transport behavior with hole mobilities up to 0.46 cm2 V–1 s–1, demonstrating that the 2,6-azulene-based conjugated copolymers can behave as p-type semiconducting materials. Our work indicates that the incorporation of electron-rich large π-conjugated units into 2,6-azulene-based conjugated polymers is an effective strategy to develop highly sensitive proton-responsive materials and high-performance hole-transporting semiconductors.
科研通智能强力驱动
Strongly Powered by AbleSci AI