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In situ high-pressure study of diborane by infrared spectroscopy

J. Chem. Phys. 131, 174506 (2009); doi:10.1063/1.3257627

Published 3 November 2009

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Yang Song,1 Chitra Murli,1 and Zhenxian Liu2
1Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
2Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, USA
As the simplest stable boron hydride in its condensed phase, diborane exhibits an interesting structural chemistry with uniquely bridged hydrogen bonds. Here we report the first room-temperature infrared (IR) absorption spectra of solid diborane compressed to pressures as high as 50 GPa using a diamond anvil cell. At room temperature and 3.5 GPa, the IR spectrum of diborane displays rich sharply resolved fundamentals and overtones of the IR active bands, consistent with the previous low-temperature IR measurements of condensed diborane at ambient pressure. When compressed stepwise to 50 GPa, several structural transformations can be identified at pressures of ~3.5 GPa, ~6.9 GPa and ~14.7 GPa, as indicated by the changes in the band profile as well as the pressure dependence of the characteristic IR modes and bandwidths. These transformations can be interpreted as being enhanced intermolecular interactions resulting from compression. The geometry of the four-member ring of B2H6, however, does not seem to be altered significantly during the transformations and the B2H6 molecule remains chemically stable up to 50 GPa. ©2009 American Institute of Physics
History: Received 16 August 2009; accepted 6 October 2009; published 3 November 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/174506/1
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KEYWORDS and PACS

Keywords
PACS
  • 62.50.-p
    High-pressure effects in solids and liquids
  • 64.70.K-
    Solid-solid transitions
  • 78.30.Hv
    Infrared and Raman spectra in nonmetallic inorganics
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

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