Pressure-Induced Diels–Alder Reactions in C 6 H 6 -C 6 F 6 Cocrystal towards Graphane Structure

Yajie Wang, Xiao Dong, Xingyu Tang, Haiyan Zheng, Kuo Li, Xiaohuan Lin, Leiming Fang, Guang'ai Sun, Xiping Chen, Lei Xie, Craig L. Bull, Nicholas P. Funnell, Takanori Hattori, Asami Sano-Furukawa, Jihua Chen, Dale K. Hensley, George D. Cody, Yang Ren, Hyun Hwi Lee, Ho kwang Mao

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Pressure-induced polymerization (PIP) of aromatics is a novel method for constructing sp 3 -carbon frameworks, and nanothreads with diamond-like structures were synthesized by compressing benzene and its derivatives. Here by compressing a benzene-hexafluorobenzene cocrystal (CHCF), H-F-substituted graphane with a layered structure in the PIP product was identified. Based on the crystal structure determined from the in situ neutron diffraction and the intermediate products identified by gas chromatography-mass spectrum, we found that at 20 GPa CHCF forms tilted columns with benzene and hexafluorobenzene stacked alternatively, and leads to a [4+2] polymer, which then transforms to short-range ordered H-F-substituted graphane. The reaction process involves [4+2] Diels–Alder, retro-Diels–Alder, and 1-1′ coupling reactions, and the former is the key reaction in the PIP. These studies confirm the elemental reactions of PIP of CHCF for the first time, and provide insight into the PIP of aromatics.

Original languageEnglish
Pages (from-to)1468-1473
Number of pages6
JournalAngewandte Chemie - International Edition
Volume58
Issue number5
DOIs
StatePublished - Jan 28 2019

Funding

The authors acknowledge the support of the National Natural Science Foundation of China (NSFC) (Grant Nos.: 21601007, 21771011 and 21875006). The authors also acknowledge the support from Science Challenge Project, No. TZ2016001 and the Top 1000-Talents Award. Experiments at the ISIS Neutron and Muon Source were supported by a beamtime allocation from the Science and Technology Facilities Council. Neutron diffraction experiments at J-PARC were performed through the J-PARC user programs (No. 2016A0191). The research at Oak Ridge National Lab's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (DOE). Electron microscopy experiments were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The calculations were performed on the TianheII supercomputer at the Chinese National Supercomputer Center in Guangzhou. The authors thank Dr. Joerg C. Neuefeind for his helps in neutron PDF measurement and thank Dr. Qiaoshi Zeng and Dr. Yufei Meng for their helps on the reduction of X-ray PDF data and IR measurements. X.D. thanks the support of NSFC (Grant No.: 21803033). The authors acknowledge the support of the National Natural Science Foundation of China (NSFC) (Grant Nos.: 21601007, 21771011 and 21875006). The authors also acknowledge the support from Science Challenge Project, No. TZ2016001 and the Top 1000-Talents Award. Experiments at the ISIS Neutron and Muon Source were supported by a beamtime allocation from the Science and Technology Facilities Council.[22]Neutron diffraction experiments at J-PARC were performed through the J-PARC user programs (No. 2016A0191). The research at Oak Ridge National Lab≫s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (DOE). Electron microscopy experiments were conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The calculations were performed on the TianheII supercomputer at the Chinese National Supercomputer Center in Guangzhou. The authors thank Dr. Joerg C. Neuefeind for his helps in neutron PDF measurement and thank Dr. Qiaoshi Zeng and Dr. Yufei Meng for their helps on the reduction of X-ray PDF data and IR measurements. X.D. thanks the support of NSFC (Grant No.: 21803033).

Keywords

  • cycloaddition
  • graphane
  • polymerization
  • solid-state reactions
  • structure determination

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