Center for Nanosystems Chemistry (CNC) & Bavarian Polymer Institute (BPI), Universität Würzburg, Theodor-Boveri-Weg, 97074, Würzburg, Germany.
Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
Angew Chem Int Ed Engl. 2017 Aug 28;56(36):10771-10774. doi: 10.1002/anie.201705137. Epub 2017 Jul 24.
A diketopyrrolopyrrole (DPP) dye self-assembles via a unique hydrogen-bonding motif into an unprecedented columnar liquid-crystalline (LC) structure. X-ray and polarized FTIR experiments reveal that the DPPs organize into a one-dimensional assembly with the chromophores oriented parallel to the columnar axis. This columnar structure is composed of two π-π-stacked DPP dimers with mirror-image configurations that stack alternately through quadruple hydrogen bonding by 90° rotation. This exotic packing is dictated by the complementarity between H-bonds and the steric demands of the wedge-shaped groups attached at the core. This novel LC supramolecular material opens a new avenue of research on DPP dye assemblies with photofunctional properties tailored by H-bonding networks.
二酮吡咯并吡咯（DPP）染料通过独特的氢键模式自组装成一种前所未有的柱状液晶（LC）结构。X 射线和偏振 FTIR 实验表明，DPP 组织成一维组装，发色团与柱状轴平行取向。这种柱状结构由两个π-π堆叠的 DPP 二聚体组成，其镜像构型通过 90°旋转的四重氢键交替堆叠。这种奇特的包装是由氢键的互补性和连接在核心上的楔形基团的空间需求决定的。这种新型 LC 超分子材料为具有光功能特性的 DPP 染料组装提供了新的研究途径，通过氢键网络可以定制这些特性。
