Pressure-Induced Diels-Alder Reactions in C6H6-C6F6 Cocrystal towards Graphane Structure
- Center for High Pressure Science and Technology Advanced Research, Beijing (China)
- China Academy of Engineering Physics, Mianyang (China). Key Lab. of Neutron Physics and Inst. of Nuclear Physics and Chemistry
- Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
- Japan Atomic Energy Agency (JAEA), Tokai (Japan). J-PARC Center
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
- Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Pohang Accelerator Lab. (PAL) (Korea, Republic of). POSTECH
- Center for High Pressure Science and Technology Advanced Research, Beijing (China); Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.
Pressure-induced polymerization (PIP) of aromatics is a novel method to construct sp3-carbon frameworks, and nanothreads with diamond-like structures were synthesized by compressing benzene and its derivatives. Here, by compressing benzene-hexafluorobenzene cocrystal (CHCF), we identified H-F-substituted graphane with a layered structure in the PIP product. Based on the crystal structure determined from the in situ neutron diffraction and the intermediate products identified by the gas chromatography-mass spectrum, we found that at 20 GPa CHCF forms tilted columns with benzene and hexafluorobenzene stacked alternatively, which leads to a [4+2] polymer, and then transfers to short-range ordered hydrogenated-fluorinated graphane. The reaction process contains [4+2] Diels-Alder, retro-Diels-Alder, and 1-1' coupling, and the former is the key reaction in the PIP. In conclusion, our studies confirmed the elemental reactions of the CHCF for the first time, which provides a novel insight into the PIP of aromatics.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS) and Center for Nanophase Materials Science (CNMS)
- Sponsoring Organization:
- National Natural Science Foundation of China (NNSFC); National Natural Science Foundation of China (NSFC); Science and Technology Facilities Council (STFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
- Grant/Contract Number:
- AC02-06CH11357; AC05-00OR22725
- OSTI ID:
- 1489507
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Vol. 58; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
From Molecules to Carbon Materials—High Pressure Induced Polymerization and Bonding Mechanisms of Unsaturated Compounds
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journal | September 2019 |
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