Yoshimura Hiroki, Oketani Ryusei, Naruoka Miki, Tohnai Norimitsu, Hisaki Ichiro
Division of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Precis Chem. 2024 Apr 12;2(5):221-228. doi: 10.1021/prechem.4c00019. eCollection 2024 May 27.
To develop porous organic frameworks, precise control of the stacking manner of two-dimensional porous motifs and structural characterization of the resultant framework are important. From these points of view, porous molecular crystals formed through reversible intermolecular hydrogen bonds, such as hydrogen-bonded organic frameworks (HOFs), can provide deep insight because of their high crystallinity, affording single-crystalline X-ray diffraction analysis. In this study, we demonstrate that the stacking manner of hydrogen-bonded hexagonal network (HexNet) sheets can be controlled by synchronizing a homological triangular macrocyclic tecton and a hydrogen-bonded cyclic supramolecular synthon called the phenylene triangle. A structure of the resultant HOF was crystallographically characterized and revealed to have a large channel aperture of 2.4 nm. The HOF also shows thermal stability up to 290 °C, which is higher than that of the conventional HexNet frameworks.
为了开发多孔有机框架，精确控制二维多孔结构基元的堆积方式以及所得框架的结构表征非常重要。从这些角度来看，通过可逆分子间氢键形成的多孔分子晶体，如氢键有机框架（HOFs），因其高结晶度而能提供深入的见解，可进行单晶X射线衍射分析。在本研究中，我们证明了通过使同系三角形大环构造单元与一种称为亚苯基三角形的氢键环状超分子合成子同步，可以控制氢键六边形网络（HexNet）片层的堆积方式。所得HOF的结构通过晶体学表征，显示具有2.4 nm的大通道孔径。该HOF还表现出高达290℃的热稳定性，高于传统的HexNet框架。
