Synthesis of novel nematic liquid crystals containing 3,3'-dimethyl-2,2'-bipyridyl |
| |
Authors: | Chi-Han Lee Takakazu Yamamoto |
| |
Institution: | Center for Bio‐Molecular Science and Engineering , Code 6900 , Naval Research Laboratory , 4555 Overlook Avenue SW, Washington, DC 20375 |
| |
Abstract: | Liquid-crystalline 3,3′-dimethyl-2,2′-bipyridyl derivatives with long 4-(alkoxyphenyl)ethynyl (-C≡C-C6H4-OR) groups in the 5,5′-positions were synthesized by palladium-catalysed crosscoupling reactions. The compounds exhibit exclusively nematic behaviour; for example, the hexyl derivative showed a nematic phase over the temperature range 145.2–205.0°C. On increasing the length of the terminal chain, the transition temperatures were lowered; for example, the hexadecyl derivative was nematic in the range 117.0–126.8°C. |
| |
Keywords: | nematic phase smectic phase liquid crystalline epoxides |
|
|