Enantiotropic nematics from cross-like 1,2,4,5-tetrakis(4'-alkyl-4-ethynylbiphenyl)benzenes and their biaxiality studies
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
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