Alternating Oligo[(2,3-O-isopropylidene-L-threitol)]-co-[(E,E)-1,4-bis(styryl)benzene]s: The Linear Chirality Transmisson Additivity Relationship in Nematic Liquid Crystals
學年 99
學期 1
出版（發表）日期 2010-09-01
作品名稱 Alternating Oligo[(2,3-O-isopropylidene-L-threitol)]-co-[(E,E)-1,4-bis(styryl)benzene]s: The Linear Chirality Transmisson Additivity Relationship in Nematic Liquid Crystals
作品名稱（其他語言）
著者 Kuo, Li-Chung; Huang, Wan-Ting; Yang, Kuei-Hui; Hsu, Hsiu-Fu; Jin, Bih-Yaw; Leung, Man-kit
單位 淡江大學化學學系
出版者 Washington: American Chemical Society
著錄名稱、卷期、頁數 The Journal of Physical Chemistry Part B 114(8), pp.2607-2616
摘要 Alternating oligo[2,3-O-isopropylidene-l-threitol]-co-[(E,E)-1,4-bis(styryl)benzene]s (denoted as 2−6 in the article) show helical twisting power (HTP), in 4-pentoxyl-4′-biphenylcarbonitrile (5OCB), linearly proportional to the number of the chiral cores in the oligomers. The HTP per chiral core of −1.75 μm−1 was recorded in the correlation plot with a correlation coefficient of R = 0.99. These results suggested that the C2 chiral l-threitol cores are aligned along the same axis. The comparable linear dichroism (LD) of 0.42 ± 0.02 obtained for (rac)-2−5 at 405 nm, and of 0.52 ± 0.03 for E7, a commercially available room temperature nematic solvent, at 347 nm in a parallel rubbed cell indicated that the long axis of the bis(styryl)benzene segments is more or less parallel to the director of the E7 in the LC matrix. This observation is highly exciting because the HTP per core could still be maintained, no matter whether the cores are evenly spread in a form of monomer in the LC matrix or tightly confined in a polymer. Theoretical treatments about the conformations of the dopant in the nematic matrix are discussed.
關鍵字
語言 en
ISSN 1520-6106
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者 Leung, Man-kit
審稿制度
國別 USA
公開徵稿
出版型式 紙本
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