Synthesis and properties of siloxane modified perylene bisimide discotic liquid crystals.
Synthesis and properties of siloxane modified perylene bisimide discotic liquid crystals.
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DOI：
10.1039/c3sm52054d
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发表时间：
2013-10
期刊：
影响因子：
3.4
通讯作者：
Ting-ting Zhang;Dianming Sun;Xiang-kui Ren;Lili Liu;Guanyin Wen;Z. Ren;Huihui Li;Shouke Yan
中科院分区：
文献类型：
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作者：
Ting-ting Zhang;Dianming Sun;Xiang-kui Ren;Lili Liu;Guanyin Wen;Z. Ren;Huihui Li;Shouke Yan
合成了一系列对称和不对称的1，6，7，12-四氯代苝双酰亚胺（PBICs），并在酰亚胺氮原子上引入硅氧烷取代基进行改性。硅氧烷取代并不明显影响PBICI的电子性质所证明的CV实验。它们显示热致性和溶致性液晶行为。研究了不同硅氧烷取代基对液晶结构的影响。小角X射线散射表明PBICl在热致液晶中采用六方柱状堆积。此外，PBICl具有良好的光学性质、良好的溶解性和成膜能力。因此，PBICl液晶的取向膜可以很容易地通过机械剪切制备，其在紫外-可见吸收光谱中表现出各向异性。
A series of symmetric and asymmetric 1,6,7,12-tetrachloroperylene bisimides (PBICls) were synthesized and modified by siloxane substituents at the imide nitrogen atom. Siloxane substitutions do not apparently affect the electronic properties of PBICIs as demonstrated by CV experiments. They display both thermotropic and lyotropic liquid crystalline behaviors. The effect of different siloxane substituents on their liquid crystal structures was investigated in detail. Small angle X-ray scattering indicates that PBICls adopt hexagonal columnar packing in thermotropic liquid crystals. In addition, PBICls exhibit good optical properties, good solubility and film-forming ability. Thus the oriented films of PBICl liquid crystals could be easily fabricated by mechanical shear, which show anisotropic properties in UV-vis absorption spectra.