Methylamine borane and dimethylamine borane have been studied under compression to 3 GPa using Raman spectroscopy and synchrotron powder X-ray diffraction. Both undergo reversible pressure-induced structural changes in this pressure range. The structural changes in the case of methylamine borane may be indicative of a second-order phase transition, taking place between ca. 0.8-1.2 GPa, which does not result in a change of space-group symmetry. In the case of dimethylamine borane, however, a reversible, reconstructive phase transition (monoclinic -> orthorhombic) occurs below 0.7 GPa. This new high-pressure phase was successfully indexed, with a possible space group assignment of Pccn or Pbcn. (C) 2017 Elsevier B.V. All rights reserved.
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College of Chemistry and Molecular Sciences, Wuhan UniversityCollege of Chemistry and Molecular Sciences, Wuhan University
Lan Wen
Zhong Zheng
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College of Chemistry and Molecular Sciences, Wuhan UniversityCollege of Chemistry and Molecular Sciences, Wuhan University
Zhong Zheng
Wei Luo
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College of Chemistry and Molecular Sciences, Wuhan University
Suzhou Institute of Wuhan UniversityCollege of Chemistry and Molecular Sciences, Wuhan University
Wei Luo
Ping Cai
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College of Chemistry and Molecular Sciences, Wuhan UniversityCollege of Chemistry and Molecular Sciences, Wuhan University
Ping Cai
Gong-Zhen Cheng
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College of Chemistry and Molecular Sciences, Wuhan UniversityCollege of Chemistry and Molecular Sciences, Wuhan University