期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 3, 期 38, 页码 9849-9858出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc02385h
关键词
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资金
- National Natural Science Foundation of China [21472012, 21202007]
- Thousand Youth Talents Plan of China
- Beijing Natural Science Foundation [2152027]
A family of narrow-band gap p-conjugated oligomers and isomers based on diketopyrrolopyrrole and difluorobenzothiadiazole coupled with an oligothiophene or thiazole ring have been successfully synthesized. They exhibited intensive absorption bands (300-900 nm) and deep-lying HOMO energy levels (-5.41 to -5.60 eV) due to donor-acceptor interactions and multiple fluorine substituents. The sequence and intensity of the electron donor moiety play an important role in determining bulk molecular properties, such as the photophysical properties, the HOMO/LUMO energy levels and mesomorphic properties. Compared with the isomer DTFB2T, D2TFBT with two n-hexyl-substituted thiophenes as the terminal groups exhibited good liquid crystal behavior with Smectic phase when cooled from 180 degrees C, and it generated a large area of the liquid-crystalline phase at about 100 degrees C. However, we did not observe such behaviors in DTFB2T due to the different sequence of the moiety.
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