期刊論文
| 學年 | 100 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2012-07-01 |
| 作品名稱 | Enantiotropic nematics from cross-like 1,2,4,5-tetrakis(4'-alkyl-4-ethynylbiphenyl)benzenes and their biaxiality studies |
| 作品名稱（其他語言） | |
| 著者 | Chen, Hsiu-Hui; Lin, Hsing-An; Lai, Yin-Hui; Lin, Shu-Yu; Chiang, Chien-Hung; Hsu, Hsiu-Fu; Shih, Tzenge-Lien; Lee, Jey-Jau; Lai, Chien-Chen; Kuo, Ting-Shen |
| 單位 | 淡江大學化學學系 |
| 出版者 | Weinheim: Wiley - V C H Verlag GmbH & Co. KGaA |
| 著錄名稱、卷期、頁數 | Chemistry - A European Journal 18(31), pp.9543–9551 |
| 摘要 | The theoretically predicted optimum length/breadth/width ratio for maximizing shape biaxiality was investigated experimentally by the facile and successful synthesis of cross-shaped compound 3, which showed enantiomeric nematic phase behavior. This cross-like core structure could alternatively be viewed as two fused V-shaped mesogens, which have recently immerged as a new direction in biaxial nematic research, at the bending tips that can act as a new structure for biaxial investigations. Whilst the thermal analysis data of compound 3 did not meet the expected theoretical values for biaxial nematics, surface-induced biaxiality was evidenced by optical studies. Cluster-size analysis within the nematic phase of compound 3 revealed the formation of meta-cybotactic nematics, which approached the cluster sizes of cybotactic nematics. The split small-angle 2D X-ray diffraction patterns of magnetic-field-aligned samples indicated that the nematic phase was composed of small smectic C-like clusters with the tilting of molecules within the clusters. The wide-temperature-range enantiomeric nematic phase of cross-like compound 3 enabled the molecular skeleton to serve as an alternative skeleton to bent-rod mesogens, which exhibited nematic phases with the potential competition of transitions to higher-order liquid-crystalline phases and crystallization, for future biaxial investigations. |
| 關鍵字 | arenes; mesogens; nematic phase; liquid crystals; X-ray diffraction |
| 語言 | en_US |
| ISSN | 0947-6539 1521-3765 |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | Hsu, Hsiu-Fu; Shih, Tzenge-Lien |
| 審稿制度 | 是 |
| 國別 | DEU |
| 公開徵稿 | |
| 出版型式 | 紙本 電子版 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/79692 ) |