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Direct Experimental Observation of in situ Dehydrogenation of an Amine-Borane System Using Gas Electron Diffraction

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Author(s)

  • Aliyu M. Ja'O
  • Sarah L. Masters
  • Derek A. Wann
  • Conor D. Rankine
  • João P.F. Nunes
  • Jean Claude Guillemin

Department/unit(s)

Publication details

JournalJournal of Physical Chemistry A
DateAccepted/In press - 17 Jul 2019
DateE-pub ahead of print - 17 Jul 2019
DatePublished (current) - 15 Aug 2019
Issue number32
Volume123
Number of pages9
Pages (from-to)7104-7112
Early online date17/07/19
Original languageEnglish

Abstract

In situ dehydrogenation of azetidine-BH3, which is a candidate for hydrogen storage, was observed with the parent and dehydrogenated analogue subjected to rigorous structural and thermochemical investigations. The structural analyses utilized gas electron diffraction supported by high-level quantum calculations, while the pathway for the unimolecular hydrogen release reaction in the absence and presence of BH3 as a bifunctional catalyst was predicted at the CBS-QB3 level. The catalyzed dehydrogenation pathway has a barrier lower than the predicted B-N bond dissociation energy, hence favoring the dehydrogenation process over the dissociation of the complex. The predicted enthalpy of dehydrogenation at the CCSD(T)/CBS level indicates that mild reaction conditions would be required for hydrogen release and that the compound is closer to thermoneutral than linear amine boranes. The entropy and free energy change for the dehydrogenation process show that the reaction is exergonic, energetically feasible, and will proceed spontaneously toward hydrogen release, all of which are important factors for hydrogen storage.

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© 2019 American Chemical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

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