Synthesis and properties of (−)-menthol-derived chiral liquid crystals by introducing adipoyloxy spacer between mesogenic core and chiral menthyl. Issue 10 (9th August 2018)

• Record Type: Journal Article
• Authors: Zhu, Zhao-Xia; Luo, Cong-Cong; Wang, Ji-Wei; Hu, Jian-She; Jia, Ying-Gang
• Is Part Of: Liquid crystals. Volume 45:Issue 10(2018)
• Page Start: 1525
• Page End: 1534
• Publication Date: 2018-08-09
• Subjects: (−)-menthol -- chiral liquid crystal -- chain length -- spacer group; Liquid crystals -- Periodicals; 548.905
• DOI: 10.1080/02678292.2018.1453557
• Languages: English
• ISSNs: 0267-8292

Abstract

ABSTRACT: A homologous series of new chiral liquid crystal compounds, M6B n B ( n = 2, 4, 6, 8, 10, 12, 14, 16, 18), with varying length of n -alkoxy chains at one end, was formed by covalently linking a chiral (− )-menthyl with biphenyl-benzoate via adipoyloxy spacer group. A combination of analysis methods such as Fourier transform infrared, 1 H NMR spectra, differential scanning calorimetry, polarised optical microscopy and X-ray diffraction was carried out to systematically investigate their phase structures and phase transition behaviours. The length of the flexible terminal alkoxy group has a profound influence on the clearing points ( T iso ) and T iso decrease with the increase of alkoxy chain ( n ). In addition, increasing the length of the terminal alkoxy group tends to narrow the temperature range of the N* phase and favour the development of chiral smectic C phase. Graphical Abstract: