Hecht Markus, Soberats Bartolome, Zhu Jian, Stepanenko Vladimir, Agarwal Seema, Greiner Andreas, Würthner Frank
Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
Nanoscale Horiz. 2019 Jan 1;4(1):169-174. doi: 10.1039/c8nh00219c. Epub 2018 Sep 20.
Electrospinning is a well-established technique for the preparation of nanofibres from polymer solution or melt, however it is rarely applied for small molecules. Here we report a unique example of a liquid-crystalline (LC) diketopyrrolopyrrole (DPP) dye that was successfully used for electrospinning. Micrometric fibres with anisotropic alignment of DPP dye were produced by this process as shown by polarized optical microscopy and selected area electron diffraction. This newly designed DPP dye self-assembles in solution by hydrogen bonding and π-π-interactions and forms columnar LC phases in the bulk. X-ray scattering and polarized FT-IR studies in the LC state revealed a hierarchical arrangement of DPP molecules into columnar structures. The successful preparation of anisotropic microfibers by electrospinning is attributed to the hydrogen bond-directed supramolecular polymerization of the new DPP dye in solution and its LC properties.
静电纺丝是一种从聚合物溶液或熔体中制备纳米纤维的成熟技术，然而它很少应用于小分子。在此，我们报道了一种独特的液晶（LC）二酮吡咯并吡咯（DPP）染料成功用于静电纺丝的例子。通过该过程制备出了具有DPP染料各向异性排列的微米级纤维，偏光光学显微镜和选区电子衍射表明了这一点。这种新设计的DPP染料在溶液中通过氢键和π-π相互作用自组装，并在本体中形成柱状液晶相。在液晶态下的X射线散射和偏振傅里叶变换红外光谱研究揭示了DPP分子排列成柱状结构的分级排列。通过静电纺丝成功制备各向异性微纤维归因于新DPP染料在溶液中的氢键导向超分子聚合及其液晶性质。
