title: The effect of position of (S)-2-octyloxy tail on the formation of frustrated blue phase and antiferroelectric phase in Schiff base liquid crystals.
abstract: Two series of chiral salicylaldimine-based liquid crystals which differ from each other in the position of the (S)-2-octyloxy tail have been synthesized and characterized by polarizing optical microscopy, differential scanning calorimetry, and electrical switching. Compounds OH I (n = 6-7) having (S)-2-octyloxy tail close to the salicylaldimine core and compounds OH II (n = 6-11) having (S)-2-octyloxy tail far from the salicylaldimine core exhibit polymorphism of mesophases including frustrated blue phase and antiferroelectric (SmC*(A)) phases. Notably, as compared with structurally similar Schiff base compounds H I (n = 7), intramolecular hydrogen bonding in antiferroelectric salicylaldimine-based compounds OH I (n = 7) induces the frustrated blue phase. However, as compared with structurally similar Schiff base compounds OH II (n = 8), the lack of intramolecular hydrogen bonding in Schiff base compounds H II (n = 8) suppresses antiferroelectric properties.
authors.affiliation: Department of Chemical Engineering, Tatung University, Taipei 104, Taiwan, Republic of China. chchhuang@ttu.edu.tw.
authors.forename: Chiung-Cheng
authors.initials: CC
authors.lastname: Huang
authors.forename: Ching-Chung
authors.initials: CC
authors.lastname: Hsu
authors.forename: Li-Wen
authors.initials: LW
authors.lastname: Chen
authors.forename: Yu-Lun
authors.initials: YL
authors.lastname: Cheng