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Pressure-induced chemistry in a nitrogen-hydrogen host–guest structure

Author

Listed:
  • Dylan K. Spaulding

    (CEA, DAM, DIF
    Present address: Department of Earth and Planetary Science, Harvard University, 20 Oxford St, Cambridge, Massachusetts 02138, USA)

  • Gunnar Weck

    (CEA, DAM, DIF)

  • Paul Loubeyre

    (CEA, DAM, DIF)

  • Fréderic Datchi

    (Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), Sorbonne Universités–UPMC Université Paris 6, CNRS UMR 7590, IRD UMR 206, MNHN)

  • Paul Dumas

    (SOLEIL, L'Orme des Merisiers)

  • Michael Hanfland

    (European Synchrotron Radiation Facility)

Abstract

New topochemistry in simple molecular systems can be explored at high pressure. Here we examine the binary nitrogen/hydrogen system using Raman spectroscopy, synchrotron X-ray diffraction, synchrotron infrared microspectroscopy and visual observation. We find a eutectic-type binary phase diagram with two stable high-pressure van der Waals compounds, which we identify as (N2)6(H2)7 and N2(H2)2. The former represents a new type of van der Waals host–guest compound in which hydrogen molecules are contained within channels in a nitrogen lattice. This compound shows evidence for a gradual, pressure-induced change in bonding from van der Waals to ionic interactions near 50 GPa, forming an amorphous dinitrogen network containing ionized ammonia in a room-temperature analogue of the Haber–Bosch process. Hydrazine is recovered on decompression. The nitrogen–hydrogen system demonstrates the potential for new pressure-driven chemistry in high-pressure structures and the promise of tailoring molecular interactions for materials synthesis.

Suggested Citation

  • Dylan K. Spaulding & Gunnar Weck & Paul Loubeyre & Fréderic Datchi & Paul Dumas & Michael Hanfland, 2014. "Pressure-induced chemistry in a nitrogen-hydrogen host–guest structure," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6739
    DOI: 10.1038/ncomms6739
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