Hydrogen-bonded bent-core blue phase liquid crystal complexes containing various molar ratios of proton acceptors and donors. Issue 38 (31st March 2016)

• Record Type: Journal Article
• Authors: Han, Chun-Chieh; Chou, Yu-Chaing; Chen, San-Yuan; Lin, Hong-Cheu
• Is Part Of: RSC advances. Volume 6:Issue 38(2016)
• Page Start: 32319
• Page End: 32327
• Publication Date: 2016-03-31
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra26827c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The molar ratio, alkyl chain length, lateral fluoro-substitution and the chiral center of H-bonded bent-core supramolecules would affect the BP ranges of BPLC complexes. H-bonded bent-core complexPIII C9 /AII F* (3/7 mol mol −1 ) displayed the widest BPI range of Δ T BPI = 12 °C. Abstract : Various hydrogen-bonded (H-bonded) bent-core liquid crystal complexes consisting of pyridyl and benzoic acid derivatives were synthesized and compared with their covalent analogues in this study. The molar ratios of pyridyl and benzoic acid derivatives could be tuned to form various H-bonded liquid crystal (LC) diads (with 1 : 1 molar ratio of H-acceptorsT and H-donorsD ) and complexes (with different molar ratios ofT andD ). By insertion of H-bonds into different positions of bent-core supramolecules, the mesophasic properties of H-bonded bent-core LC complexes were optimized, which could facilitate the most suitable LC components and compositions to be utilized in H-bonded blue phase (BP) LC complexes. In BPLC complexes, the molar ratios, alkyl chain lengths, the lateral fluoro-substitution and the chiral center of H-bonded bent-core supramolecules would affect the temperature ranges of BPs. Accordingly, H-bonded bent-core complexPIII C9 /AII F* (3/7 mol mol −1 ) displayed the widest BPI range of Δ T BPI = 12.0 °C at the correspondent H-acceptorT =PIII C9 and H-donorD =AII F* . Since the covalent-bonded bent-core mixture only had narrow ranges of BPIII, we could summarize that the introduction of H-bonds into the bent-core center effectively stabilizes the BPs and easier induces the BPI.