標題: Liquid crystalline non-linear S-shaped oligomers consisting of azobenzene and biphenylene units: synthesis, characterisation and influence of central spacer
作者: Osman, Faridah
Yeap, Guan-Yeow
Maeta, Nobuyuki
Ito, Masato M.
Lin, Chien-Min
Lin, Hong Cheu
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: S-shaped oligomer;inner spacer;monotropic;enantiotropic;intercalated;photoisomerisation properties
公開日期: 1-Jan-2017
摘要: A series of non-linear S-shaped liquid crystal oligomers wherein the molecule consists of biphenylene moiety as a central core unit and two symmetrical side arms azobenzene moieties joined to catechol as a linkage group have been successfully synthesised and characterised. The members in this series possess different inner spacer with carbon number n ranging from 4 to 9 while the outer spacer length located in azobenzene moieties are remains unaltered. The members with even parity exhibit monotropic phase, whereas homologues with odd parity display enantiotropic phase. The appearance of nematic, smectic A and smectic B phases was validated with texture observation under polarised light and X-ray diffraction (XRD). The XRD study on the S-shaped oligomer indicates that the arrangement of smectic phase exists as an intercalated structure. The S-shaped oligomer shows photoisomerisation properties in solution whereby the trans to cis isomerisation for this molecule is accomplished 1140 s, whereas reverse process under thermal back reaction occurred in 4620 min. [GRAPHICS] .
URI: http://dx.doi.org/10.1080/02678292.2017.1360522
http://hdl.handle.net/11536/144322
ISSN: 0267-8292
DOI: 10.1080/02678292.2017.1360522
期刊: LIQUID CRYSTALS
Volume: 44
起始頁: 2355
結束頁: 2365
Appears in Collections:Articles