Raman spectroscopy study of ammonia borane at high pressure
- Stanford
Ammonia borane, NH{sub 3}BH{sub 3}, has attracted significant interest as a promising candidate material for hydrogen storage. The effect of pressure on the bonding in NH{sub 3}BH{sub 3} was investigated using Raman spectroscopy to over 20 GPa in a diamond anvil cell, and two new transitions were observed at approximately 5 and 12 GPa. Vibrational frequencies for the modes of the NH{sub 3} proton donor group exhibited negative pressure dependence, which is consistent with the behavior of conventional hydrogen bonds, while the vibrational frequencies of the BH{sub 3} proton acceptor group showed positive pressure dependence. The observed behavior of these stretching modes supports the presence of dihydrogen bonding at high pressure. In addition, the BH{sub 3} and NH{sub 3} bending modes showed an increase in spectral complexity with increasing pressure together with a discontinuity in d?/dP which suggests rotational disorder in this molecule. These results may provide guidance for understanding and developing improved hydrogen storage materials.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1007039
- Journal Information:
- J. Chem. Phys., Vol. 129, Issue (23) ; 2008; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- ENGLISH
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