Lateral fluoro-substitution and chiral effects on supramolecular liquid crystals containing rod-like and H-bonded bent-core mesogens. Issue 112 (21st November 2016)

• Record Type: Journal Article
• Authors: Han, Chun-Chieh; Yang, Li-Han; Raghunath, Putikam; Lin, Ming-Chang; Kumar, Rohit; Lin, Hong-Cheu
• Is Part Of: RSC advances. Volume 6:Issue 112(2016)
• Page Start: 110482
• Page End: 110492
• Publication Date: 2016-11-21
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra19266a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : We report the first series of liquid crystalline supramolecular diads containing asymmetric rod-like and H-bonded bent-core mesogens with a wide BPI range, where biaxial parameters and HTP values are the most important factors to stabilize the BPI. Abstract : The first series of liquid crystalline supramolecular diadsC /D containing asymmetric rod-like and H-bonded bent-core mesogens were designed and synthesised, among which supramolecular diad / 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 °C. According to the molecular modeling, a large biaxial parameter (≥3.2) and an appropriate HTP value (4.2–4.8 μm −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 / (without lateral fluoride substitution). Finally, the special optimal 1 : 1 molar ratio of supramolecular diad / ( 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.