標題: Hydrogen-bonded effects on supramolecular blue phase liquid crystal dimeric complexes
作者: Wei, Chong-Lun
Chen, Te-Cheng
Raghunath, Putikam
Lin, Ming-Chang
Lin, Hong-Cheu
材料科學與工程學系
應用化學系分子科學碩博班
Department of Materials Science and Engineering
Institute of Molecular science
公開日期: 1-Jan-2015
摘要: In this study, a series of novel asymmetric hydrogen-bonded (H-bonded) dimeric complexes D/P and D/P* (proton donors D = A, A*, AF and AF*) were synthesized and self-assembled by appropriate molar ratios of H-donors (A, A*, AF and AF*) and H-acceptors (P and P*). In addition, the influences of the lateral fluoro-substituent of H-donors, the number (along with the position) of chiral centers and the molar ratio of H-donors and H-acceptors on the mesophasic behaviours (e.g., BPs) of asymmetric H-bonded dimeric complexes are investigated. Interestingly, the blue phase (i.e., BPI) was observed in complexes A*/P, A*/P*, AF*/P and AF*/P* containing at least a chiral center in H-donors (A* and AF*), including the widest BPI ranges of complexes AF*/P* (ca. 6 degrees C and 13 degrees C for 1 : 1 and 3 : 1 mol, respectively). For the first time, the hydrogen-bonded effects on supramolecular blue phase LCs are compared with their analogous covalent diads. Based on our theoretical calculation, we discovered that the bend angle plays an important role in manipulating the existence of the blue phase, which is preferred to appear at the bend angle within 132.1-152.9 degrees. Hence, owing to inappropriate bend angles, both H-bonded dimeric complex A/P* and covalent diad A*-P (with bend angles of 162.0 degrees and 126.5 degrees, respectively) did not possess any blue phase.
URI: http://dx.doi.org/10.1039/c5ra06868a
http://hdl.handle.net/11536/127949
ISSN: 2046-2069
DOI: 10.1039/c5ra06868a
期刊: RSC ADVANCES
Volume: 5
Issue: 67
起始頁: 54629
結束頁: 54637
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