Dong Hee Lee, Jihye Oh, Jaewook An, Taehun Kim, Kyunghye Ju, In-Hyeok Park
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引用次数: 0
Abstract
Each of the supramolecular isomerism and the solid-state [2 + 2] photocycloaddition has been developed as an independent research topic in crystal engineering. We herein report the solvent-dependent formations of the olefin-based supramolecular isomers (1 and 2) showing different photoreactivity. In the solvothermal reaction of Zn(NO3)2·6H2O, 1,2-bis(4-pyridyl)ethylene (bpe), and 1-adamantanecarboxylic acid (Hadc) in dimethylacetamide(DMA)/water, we obtained a zigzag-shaped coordination polymer of the type [Zn(bpe)(adc)2] (1). When dimethylformamide (DMF) was used instead of DMA, the railroad-shaped supramolecular isomer 2 was isolated. In 2, the dinuclear repeating units, Zn2(adc)4 as railroad ties, are dilinked by bpe ligands. Under ultraviolet (UV) irradiation, isomer 1 was photoinert due to the large separation between the olefin (C═C) bonds in the bpe ligands. In contrast, isomer 2 was photoreactive because the olefin bonds of the parallel bpe linker ligands are well aligned in a face-to-face mode and separated by a distance of 3.79 Å to undergo [2 + 2] photocycloaddition quantitatively via an single-crystal-to-single-crystal (SCSC) manner. All of these products exhibit yellow emission in the 385–388 nm region with different intensities depending on the local structures.
期刊介绍:
The aim of Crystal Growth & Design is to stimulate crossfertilization of knowledge among scientists and engineers working in the fields of crystal growth, crystal engineering, and the industrial application of crystalline materials.
Crystal Growth & Design publishes theoretical and experimental studies of the physical, chemical, and biological phenomena and processes related to the design, growth, and application of crystalline materials. Synergistic approaches originating from different disciplines and technologies and integrating the fields of crystal growth, crystal engineering, intermolecular interactions, and industrial application are encouraged.