Abstract
Solid-state topochemical polymerization (SSTP) is a promising method to construct functional crystalline polymeric materials, but in contrast to various reactions that happen in solution, only very limited types of SSTP reactions are reported. Diels-Alder (DA) and dehydro-DA (DDA) reactions are textbook reactions for preparing six-membered rings in solution but are scarcely seen in solid-state synthesis. Here, using multiple cutting-edge techniques, we demonstrate that the solid 1,4-diphenylbutadiyne (DPB) undergoes a DDA reaction under 10-20 GPa with the phenyl as the dienophile. The crystal structure at the critical pressure shows that this reaction is "distance-selected". The distance of 3.2 Å between the phenyl and the phenylethynyl facilitates the DDA reaction, while the distances for other DDA and 1,4-addition reactions are too large to allow the bonding. The obtained products are crystalline armchair graphitic nanoribbons, and hence our studies open a new route to construct the crystalline carbon materials with atomic-scale control.
Original language | English |
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Pages (from-to) | 17662-17669 |
Number of pages | 8 |
Journal | Journal of the American Chemical Society |
Volume | 142 |
Issue number | 41 |
DOIs | |
State | Published - Oct 14 2020 |
Funding
The authors acknowledge the support of the National Natural Science Foundation of China (NSFC) (Grant nos. 21771011 and 21875006). The authors also acknowledge the support of the National Key Research and Development Program of China (2019YFA0708502). This research used resources of the Advanced Light Source, which is a U.S. Department of Energy (DOE) Office of Science User Facility under Contract no. DE-AC02-05CH11231. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Neutron diffraction experiments at J-PARC were performed through the J-PARC user programs (nos. 2018B0249 and 2018BF2106). High-resolution solid-state C NMR were measured at National High Magnetic Field Laboratory supported by the U.S. NSF Cooperative Agreement DMR-1644779 and the State of Florida. The calculations were performed on the TianheII supercomputer at the Chinese National Supercomputer Center in Guangzhou. The authors thank Dr. Haijun Yang for his help in the synthesis of deuterated DPB, Dr. Xiaohuan Lin for her help in the analysis of XRD data, Dr. Xiaoge Wang and Ms. Yunling Jia for their help in the HRTEM experiments, and Dr. Hyun Hwi Lee for his help in the in situ XRD measurements performed in the 5A XRS-MS beamline at the Pohang Accelerator Laboratory (PAL). Dr. K. Li thanks Dr. T. A. Strobel for helpful discussion. 13
Funders | Funder number |
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State of Florida | |
National Science Foundation | DMR-1644779 |
National Science Foundation | |
U.S. Department of Energy | |
Office of Science | DE-AC02-05CH11231 |
Office of Science | |
National Natural Science Foundation of China | 21875006, 21771011 |
National Natural Science Foundation of China | |
National Key Research and Development Program of China | 2019YFA0708502 |
National Key Research and Development Program of China |