Matsumoto Naoto, Nakagawa Sakura, Morisato Kei, Kanamori Kazuyoshi, Nakanishi Kazuki, Yanai Nobuhiro
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University 744 Moto-oka, Nishi-ku Fukuoka 819-0395 Japan
Department of Chemistry, Graduate School of Science, Kyoto University Kitashirakawa, Sakyo-ku Kyoto 606-8502 Japan.
Chem Sci. 2024 Jun 19;15(29):11500-11506. doi: 10.1039/d4sc01650e. eCollection 2024 Jul 24.
Organic crystals are a promising class of materials for various optical applications. However, it has been challenging to make macroscopic organic crystals with bicontinuous porosity that are applicable to flow chemistry. In this study, a new class of porous materials, cm-scale crystalline organic monoliths (COMs) with bicontinuous porosity, are synthesized by replicating the porous structure of silica monolith templates. The COMs composed of -terphenyl can take up more than 30 wt% of an aqueous solution, and the photophysical properties of the -terphenyl crystals are well maintained in the COMs. The relatively high surface area of the COMs can be exploited for efficient Dexter energy transfer from triplet sensitizers on the pore surface. The resulting triplet excitons in the COMs encounter and annihilate, generating upconverted UV emission. The COMs would open a new avenue toward applications of organic crystals in flow photoreaction systems.
有机晶体是一类很有前途的材料，可用于各种光学应用。然而，制备适用于流动化学的具有双连续孔隙率的宏观有机晶体一直具有挑战性。在本研究中，通过复制二氧化硅整体模板的多孔结构，合成了一类新型的多孔材料，即具有双连续孔隙率的厘米级结晶有机整体材料（COM）。由对三联苯组成的COM可以吸收超过30 wt%的水溶液，并且对三联苯晶体的光物理性质在COM中得到了很好的保持。COM相对较高的表面积可用于实现从孔表面的三重态敏化剂进行高效的德克斯特能量转移。COM中产生的三重态激子相互碰撞并湮灭，产生上转换紫外发射。COM将为有机晶体在流动光反应系统中的应用开辟一条新途径。
