Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China.
Institute of Chemistry, Chinese Academy of Science (ICCAS), Beijing, 100190, China.
Angew Chem Int Ed Engl. 2017 Jun 26;56(27):7831-7835. doi: 10.1002/anie.201703439. Epub 2017 Jun 1.
Cocrystals of 4-styrylpyridine and 1,2,4,5-tetracyanobenzene were successfully prepared by supramolecular self-assembly. Donor-acceptor interactions between the molecular components are the main driving force for self-assembly and contribute to intermolecular charge transfer. The cocrystals possess two-photon absorption properties that are not observed in the individual components; suggesting that two-photon absorption originates from intermolecular charge-transfer interactions in the donor-acceptor system. The origin of two-photon absorption in multichromophore systems remains under-researched; thus, the system offers a rare demonstration of two-photon absorption by cocrystallization. Cocrystal engineering may facilitate further design and development of novel materials for nonlinear optical and optoelectronic applications.
4-苯乙烯吡啶和 1,2,4,5-四氰基苯通过超分子自组装成功制备出共晶。分子组件之间的给体-受体相互作用是自组装的主要驱动力，并有助于分子间电荷转移。共晶具有双光子吸收特性，而在单个组件中则观察不到；这表明双光子吸收源于供体-受体体系中的分子间电荷转移相互作用。在多生色团体系中，双光子吸收的起源仍研究不足；因此，该体系为通过共晶化实现双光子吸收提供了一个罕见的例证。共晶工程可能有助于进一步设计和开发用于非线性光学和光电应用的新型材料。
