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: | 1-一月-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 |
顯示於類別: | 期刊論文 |