Stabilization of the blue phases of simple rodlike monoester compounds by addition of their achiral homologues
作者:Keiki Kishikawa、Hiroyuki Itoh、Seiji Akiyama、Takahiro Kobayashi、Shigeo Kohmoto
DOI:10.1039/c2jm16359d
日期:——
As novel rodlike liquid crystalline ester compounds exhibiting blue phases (BPs), chiral 4-(4′-alkoxyphenyl)phenyl 4-(4′-alkoxyphenyl)benzoate derivatives (R–C6H4–C6H4–OCO–C6H4–C6H4–R′), 1 (R = R′ = (R)-1-methylheptyloxy, BP range: 1.6 K on heating), 2 (R = (R)-1-methylheptyloxy, R′ = n-octyloxy, BP range: 0.8 K on heating), 4 (R = (R)-1-methylheptyloxy, R′ = H, BP range: 1.0 K on heating), were synthesized and their phase behaviors were investigated. Further, the BP of 1 was stabilized by addition of its achiral homologue ester compound 3 (R = R′ = n-octyloxy). In the range of the composite ratio of 1 : 3 from 10 : 0 to 0 : 10, the BP temperature range became wider with increase of the content of 3 in the mixture. At the ratio of 6 : 4, the BP indicated the widest temperature range in the mixing experiment (5.0 K on heating and 6.0 K on cooling).
1 (R = R′ = (R)-1-methylheptyloxy, BP range: 1.6 K on heating), 2 (R = (R)-1-methylheptyloxy, R′ = n-octyloxy, BP range:加热时的 BP 范围:0.8 K),4(R = (R)-1-甲基庚氧基,R′ = H,加热时的 BP 范围:1.0 K合成并研究了它们的相行为。此外,通过添加其非手性同族酯化合物 3(R = R′ = 正辛基氧基),稳定了 1 的 BP。在 1 :3 的复合比例范围内,从 10 :0 到 0 :10 的范围内,随着混合物中 3 的含量增加,BP 温度范围变宽。当比例为 6 :在混合实验中,BP 的温度范围最广(加热时为 5.0 K,冷却时为 6.0 K)。