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Amplification of macromolecular helicity of dynamic helical poly(phenylacetylene)s bearing non-racemic alanine pendants in dilute solution, liquid crystal and two-dimensional crystal
被引:0
作者:
Sousuke Ohsawa
Shin-ichiro Sakurai
Kanji Nagai
Katsuhiro Maeda
Jiro Kumaki
Eiji Yashima
机构:
[1] Graduate School of Engineering,Department of Molecular Design and Engineering
[2] Nagoya University,undefined
[3] Yashima Super-structured Helix Project,undefined
[4] Exploratory Research for Advanced Technology (ERATO),undefined
[5] Japan Science and Technology Agency (JST),undefined
[6] 3Current address: Department of Applied Chemistry,undefined
[7] Graduate School of Engineering,undefined
[8] Nagoya University.,undefined
[9] 4Current address: Graduate School of Natural Science and Technology,undefined
[10] Kanazawa University,undefined
[11] Kakuma-machi,undefined
[12] Kanazawa 920-1192,undefined
[13] Japan.,undefined
[14] 5Current address: Department of Polymer Science and Engineering,undefined
[15] Graduate School of Science and Engineering,undefined
[16] Yamagata University,undefined
[17] 4-3-16,undefined
[18] Jonan,undefined
[19] Yonezawa,undefined
[20] Yamagata 992-8510,undefined
[21] Japan.,undefined
来源:
Polymer Journal
|
2012年
/
44卷
关键词:
atomic force microscopy;
chiral amplification;
chirality;
circular dichroism;
helical structure;
helix inversion;
liquid crystal;
D O I:
暂无
中图分类号:
学科分类号:
摘要:
Optically active poly(phenylacetylene) copolymers composed of non-racemic phenylacetylenes bearing L- and D-alanine decyl esters as the side groups (poly(1Lm-co-1Dn), m>n) were prepared by the copolymerization of the corresponding L- and D-phenylacetylenes with different enantiomeric excesses using a rhodium catalyst; their chiral amplification of the helical conformation as an excess of one-handedness in a dilute solution, in a lyotropic liquid-crystalline (LC) state and in a two-dimensional (2D) crystal on substrate was investigated by measuring the circular dichroism spectra of the copolymers at different temperatures, mesoscopic cholesteric twist in the LC state (cholesteric helical pitch) and high-resolution atomic force microscopy images of the self-assembled 2D helix-bundle structures of the copolymer chains, respectively.
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页码:42 / 50
页数:8
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