Phase transitions and birefringence of bistolane-based nematic molecules with an alkyl, alkoxy and alkylthio group
Phase transitions and birefringence of bistolane-based nematic molecules with an alkyl, alkoxy and alkylthio group
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DOI：
10.1080/15421406.2017.1289662
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发表时间：
2017-01-01
影响因子：
0.7
通讯作者：
Tsuji, Hideto
中科院分区：
文献类型：
--
作者：
Arakawa, Yuki;Tsuji, Hideto
为了弄清楚端基对相变和双折射的影响，我们对两个对位具有相同尾长的庚基、己氧基、己硫基的非氟化和中心氟化液晶1,4-双(苯基乙炔基)苯分子进行了比较研究。这些分子显示出端基对相变的显着影响。接近温度下的双折射值以及氟化族的有序参数 (S) = 1 的顺序为烷硫基 > 烷氧基 > 烷基类似物，与其极化率相对应。
In order to figure out the effects of terminal groups on phase transitions and birefringence, we performed a comparative study for non-fluorinated and centrally fluorinated liquid crystalline 1,4-bis(phenylethynyl)benzene molecules with the same tail length of heptyl, hexyloxy, hexylthio groups at both para positions. These molecules showed remarkable effects of the terminal groups to the phase transitions. The birefringence values at close temperatures, as well as an order parameter (S) = 1 for a fluorinated family, are in the following order of alkylthio > alkoxy > alkyl analogues, corresponding to their polarizabilities.