標題: Lateral fluoro-substitution and chiral effects on supramolecular liquid crystals containing rod-like and H-bonded bent-core mesogens
作者: Han, Chun-Chieh
Yang, Li-Han
Raghunath, Putikam
Lin, Ming-Chang
Kumar, Rohit
Lin, Hong-Cheu
材料科學與工程學系
應用化學系
Department of Materials Science and Engineering
Department of Applied Chemistry
公開日期: 2016
摘要: The first series of liquid crystalline supramolecular diads C/D containing asymmetric rod-like and H-bonded bent-core mesogens were designed and synthesised, among which supramolecular diad P*(III)/A*(II) with two chiral centers on both the H-acceptor/H-donor and non-lateral fluoride substitution possessed a wide blue phase (BPI) range of 13.7 degrees C. According to the molecular modeling, a large biaxial parameter (>= 3.2) and an appropriate HTP value (4.2-4.8 mu m(-1)) are the most important factors to stabilize the double twisted cylinder structure (i.e., BPI) in supramolecular diads. Moreover, the bent angles, biaxial parameters and dipole moments of supramolecular diads are mainly affected by the locations and numbers of H-bonds and chiral centers. Not only larger bent angles and biaxial parameters but also smaller dipole moments and HTP values were obtained by removing the lateral fluoride substitution on supramolecular diads to achieve the blue phase of P*(III)/A*(II) (without lateral fluoride substitution). Finally, the special optimal 1 : 1 molar ratio of supramolecular diad P*(III)/A*(II) (i.e., H-donor = 50 mol%) with the widest blue phase range is mainly attributed to its rod-like and H-bonded bent-core mesogens, rather than H-donor = 75 mol% in most supramolecular complexes containing linear H-bonded rod-like mesogens.
URI: http://dx.doi.org/10.1039/c6ra19266a
http://hdl.handle.net/11536/132910
ISSN: 2046-2069
DOI: 10.1039/c6ra19266a
期刊: RSC ADVANCES
Volume: 6
Issue: 112
起始頁: 110482
結束頁: 110492
顯示於類別:期刊論文