Photomodulation of a chiral nematic liquid crystal by the use of a photoresponsive ruthenium(III) complex

Tadashi Mitsuoka, Hisako Sato, Jun Yoshida, Akihiko Yamasishi, Yasuaki Einaga

研究成果: Article査読

33 被引用数 (Scopus)

抄録

We have attempted to control the helical pitch of a chiral nematic liquid crystal by the use of a photoresponsive chiral metal complex. For this purpose, a novel Ru(III) complex [Ru(acac)2(L)] was synthesized, where acac and L denote acetylacetonato and 1,3-bis-{4-[6-(4-phenylazo-phenoxy)-hexyloxy]- phenyl}-propane-1,3 -dionato, respectively. The complex underwent cis-trans photoisomerization in methanol when under UV (λmax = 360 nm) or visible (λmax = 450 nm) light illumination, respectively. When the complex was doped into a room-temperature nematic liquid crystal (ZLI-1132), it induced a chiral nematic phase. Under illumination with UV or visible light, the helical pitch of the chiral nematic phase could be changed reversibly by up to 50%. Corresponding to this change, the helical twisting power (HTP) of the complex varied between 34.0 and 22.0 μm-1, or between -43.9 and -26.6 μm-1 at 35.0 °C, where the positive and negative signs corresponded to the A- and Δ-enantiomers, respectively. This has been the first attempt at combining the ΔΛ chirality of an octahedral metal complex with the cis-trans isomerization of an azobenzene group in the development of a photoresponsive dopant.

本文言語English
ページ(範囲)3442-3447
ページ数6
ジャーナルChemistry of Materials
18
15
DOI
出版ステータスPublished - 2006 7 25

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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