5443-37-8Relevant articles and documents
Self-assembly of bistriazole BDT based bolaamphiphiles into SmA phase and helical organogels
Cheng, Xiaohong,Gao, Hongfei,Liu, Yuantao,Yan, Qi,Zhang, Deling
, (2021/01/12)
Bistriazole benzo[1,2-b:4,3-b′]dithiophene (BDT) contained bolaamphiphiles have been synthesized via Sonogashira coupling and click reactions as key steps. For such compounds, the central bent bistriazole BDT core, the flexible methylene spacer led the rodlike core together with the terminal diol groups to twist to be U-shaped polar region. Micro-segregation of U-shaped polar region from the lipophilic chains generated a SmA phase. Furthermore, these compounds can act as super organogelators to gel different kinds of solvents with the lowest critical gelation concentration (CGC) of 0.2 mg/ml. Gel morphologies with scarcely reported nanostructures including nanofibers, nanobelts, nanodisks, nanotrumpets and nanotubes were firstly observed in bolaamphiphilic self-assembly system.
A series of novel side chain liquid crystalline polysiloxanes containing cyano- and cholesterol-terminated substituents: Where will the structure-dependence of terminal behavior of the side chain reappear?
Yao, Wenhuan,Gao, Yanzi,Zhang, Cuihong,Li, Chenyue,Li, Fasheng,Yang, Zhou,Zhang, Lanying
, p. 1765 - 1772 (2017/04/13)
A series of polysiloxane side chain liquid crystal polymers with strong polarity cyano substitution-terminated achiral side chains and cholesterol-terminated chiral side chains was successfully synthesized via thiol-ene click chemistry. 1H-NMR, FT-IR, and thermogravimetric analysis were used to confirm their chemical structures and thermal stabilities. Their phase transition behaviors and phase structures were systematically investigated by a combination of analysis methods such as differential scanning calorimetry, polarized optical microscopy, and X-ray. Results revealed that attributing to the decisive role of the polarity interaction, all the polymers only developed a monolayer interdigitated SmA phase in which the period arrangement was determined by the cyano-terminated side chains, the increased content of cholesterol-terminated chiral side chains (Xchol) just expanded the distance between neighboring molecules within a layer.
Synthesis and characterization of liquid crystalline organosiloxanes containing 4-methoxyphenyl 4-(2-alkenyloxy)benzoate
Chen, Cheng-Chih,Lin, Chih-Hung
, p. 1270 - 1274 (2016/04/10)
A series of new organosiloxane liquid crystalline materials based on the 4-methoxyphenyl-4-(ù-alkenyloxy)benzoate as mesogenic units have been synthesized and their mesomorphic and physical properties have been characterized. A series of new disiloxanes and trisiloxanes contain 4-methoxyphenyl 4-(ù-alkenyloxy)benzoate as mesogenic these were synthesized by addition of 4-methoxyphenyl 4-(ù-alkenyloxy)benzoate moiety to pentamethylhydrodisiloxane or heptamethylhydrotrisiloxane catalyzed by platinum divinyltetramethyldisiloxane complex. The thermal properties of this new series of thermotropic liquid-crystalline siloxanes were studied by differential scanning calorimetry and polarized optical microscope. Disiloxane series compounds were not showed any liquid crystal phase. Trisiloxanes series compounds exhibited nematic liquid crystal phase. The siloxane molecule helped to reduce the melting temperature. The thermal properties of the new siloxane series exhibited a pronounced odd-even effect with the length of alkyl segment.
