Benzo[g]chrysene Discotic Liquid Crystals: Synthesis, Columnar Mesophase and Photophysical Properties
Received date: 2021-08-25
Online published: 2021-10-15
Supported by
National Natural Science Foundation of China(51773140); National Natural Science Foundation of China(51973143)
Discotic liquid crystal consisting of polycyclic aromatic hydrocarbon (PAH) core and peripheral alkyl chains is a kind of soft organic materials showing semiconductivity and fluorescence, and it can be fabricated into opto-electronic devices by solution process or printing technique, with low-cost advantage. We report benzo[g]chrysene unsymmetrical functional discotic liquid crystals, which were synthesized by Suzuki-Miyaura cross-coupling reaction and Scholl oxidative annulation. Five new π-extended compounds containing ester, anhydride, imide and benzoimidazole unit were synthesized and characterized. Their liquid crystalline property was fully characterized by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and small-angle X-ray scattering (SAXS), these compounds showed ordered columnar hexagonal (Colhex) mesophase with broad mesophase range as wide as 206 ℃. The functional groups have essential impact on the phase transition temperatures. The ultraviolet-visible (UV-Vis) absorption and photoluminescent property were studied, they displayed fluorescent quantum yield as high as 34% in solution, and the emission spectra can be tuned from blue, green to red by functional group and π-conjugation extension. Density functional theory (DFT) computation results explained these physical properties. We anticipate that more π-extended functional molecules can be developed from naphthalic anhydride by our method.
Xue-Min Zhu , Xiao-Yan Bai , Hai-Feng Wang , Ping Hu , Bi-Qin Wang , Ke-Qing Zhao . Benzo[g]chrysene Discotic Liquid Crystals: Synthesis, Columnar Mesophase and Photophysical Properties[J]. Acta Chimica Sinica, 2021 , 79(12) : 1486 -1493 . DOI: 10.6023/A21080397
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