Gan Kian Ping, Yoshio Masafumi, Sugihara Yuki, Kato Takashi
Department of Chemistry and Biotechnology , School of Engineering , The University of Tokyo , Hongo, Bunkyo-ku , Tokyo 113-8656 , Japan . Email:
Chem Sci. 2017 Oct 24;9(3):576-585. doi: 10.1039/c7sc03764c. eCollection 2018 Jan 21.
We here report the supramolecular self-assembly of hydrogen-bonded motifs for the development of nanostructured materials that exhibit dynamic functions such as stimuli-responsive properties and molecular recognition behaviour. We have designed and synthesised new thermotropic bicontinuous and columnar liquid-crystalline (LC) guanine-oligothiophene conjugates tethered with lipophilic chains, which exhibit ionic, electronic and photoluminescence properties. Their potassium salt complexes self-assemble into thermotropic columnar LC phases. Time-of-flight photoconductivity measurements have revealed that the guanine-oligothiophene conjugates in the LC states possess charge transport abilities with either electron or ambipolar mobility values of 10 to 10 cm V s. Furthermore, we have found that the complexation of potassium ions with the guanine motif could lead not only to structural change and thermal stabilization of the LC phases but also to a photoluminescence colour change in the solid states. The strategy presented in this work could lead to the design of new functional LC materials that could potentially be applicable as sensors and electronic devices.
我们在此报告用于开发具有刺激响应特性和分子识别行为等动态功能的纳米结构材料的氢键基序超分子自组装。我们设计并合成了新的热致双连续和柱状液晶（LC）鸟嘌呤 - 寡噻吩共轭物，其与亲脂性链相连，具有离子、电子和光致发光特性。它们的钾盐配合物自组装成热致柱状液晶相。飞行时间光电导率测量表明，处于液晶态的鸟嘌呤 - 寡噻吩共轭物具有电荷传输能力，电子或双极性迁移率值为10至10 cm V s。此外，我们发现钾离子与鸟嘌呤基序的络合不仅会导致液晶相的结构变化和热稳定性，还会导致固态下的光致发光颜色变化。这项工作中提出的策略可能会导致设计出新的功能性液晶材料，这些材料有可能用作传感器和电子设备。
