Photomodulation of a chiral nematic liquid crystal by the use of a photoresponsive ruthenium(III) complex
Photomodulation of a chiral nematic liquid crystal by the use of a photoresponsive ruthenium(III) complex
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DOI：
10.1021/cm060282n
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发表时间：
2006-06
影响因子：
8.6
通讯作者：
T. Mitsuoka;Hisako Sato;J. Yoshida;ठand Akihiko Yamagishi;Y. Einaga
中科院分区：
文献类型：
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作者：
T. Mitsuoka;Hisako Sato;J. Yoshida;ठand Akihiko Yamagishi;Y. Einaga
我们试图利用光响应性手性金属配合物来控制手性向列相液晶的螺旋节距。为此，合成了一种新型的Ru（III）配合物[Ru(acac)2(L)]，其中acac和L分别表示乙酰丙酮和1,3-二-{4-[6-（4-苯基偶氮-苯氧基）-己氧基]-苯基}-丙烷-1,3 -dionato。在紫外（λmax = 360 nm）和可见光（λmax = 450 nm）光照下，配合物分别在甲醇中顺式-反式光异构化。将该配合物掺入室温向列相液晶（ZLI-1132）中，诱导出手性向列相。在紫外或可见光照射下，手性向列相的螺旋节距可以可逆地改变高达50%。在35.0℃时，配合物的螺旋扭转力（HTP）在34.0 ~ 22.0 μm-1和- 43.9 ~ - 26.6 μm-1之间变化，其中正负号分别对应Λ-和Δ-enantiomers。这是…
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 Λ- and Δ-enantiomers, respectively. This has been the...