Liquid-crystalline perylene tetracarboxylic bisimide derivative bearing trisiloxan-2-yl moieties: Influence on mesomorphic property and electron transport
Liquid-crystalline perylene tetracarboxylic bisimide derivative bearing trisiloxan-2-yl moieties: Influence on mesomorphic property and electron transport
复制标题
带有三硅氧烷-2-基部分的液晶苝四羧基双酰亚胺衍生物：对介晶性质和电子传输的影响
DOI：
10.1039/c5ra23119a
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
A. Sonoda
中科院分区：
文献类型：
--
作者：
M. Funahash;N. Takeuchi;A. Sonoda
介晶和电子传输性能进行了比较，液晶（LC）的苝四羧酸双酰亚胺（PTCBI）衍生物轴承线性二硅氧烷和三硅氧烷链，以及双（三甲基异丙基）甲基甲硅烷基（三甲基异丙基-2-基）基团。与烷基取代的类似物相比，与具有线性三硅氧烷链的PTCBI衍生物相比，具有大体积的三硅氧烷-2-基部分的PTCBI衍生物表现出更有序的柱状相和更高的电子迁移率。尽管体积庞大，但三聚环己-2-基部分不抑制柱状聚集体内的闭合π-π堆积。因此，在带有支化的三亚烷-2-基部分的化合物的有序柱状相中的电子迁移率在室温下为0.05 cm 2 V−1 s−1，并且在120 °C下超过0.1 cm 2 V−1 s−1。
Mesomorphic and electron transport properties are compared for liquid-crystalline (LC) perylene tetracarboxylic bisimide (PTCBI) derivatives bearing linear disiloxane and trisiloxane chains, as well as bis(trimethylsiloxanyl)methylsilyl(trisiloxan-2-yl) groups. In contrast to alkyl-substituted analogues, the PTCBI derivative bearing bulky trisiloxan-2-yl moieties exhibits a more ordered columnar phase and higher electron mobility compared to that bearing linear trisiloxane chains. In spite of the bulkiness, the trisiloxan-2-yl moieties do not inhibit closed π–π stacking within the columnar aggregates. Therefore the electron mobility in the ordered columnar phase of the compound bearing the branched trisiloxan-2-yl moieties was 0.05 cm2 V−1 s−1 at room temperature and it exceeded 0.1 cm2 V−1 s−1 at 120 °C.