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Issue 15, 2010

The crystal structures of the low-temperature and high-pressure polymorphs of nitric acid

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Abstract

A new high-pressure phase of pure nitric acid (HNO3) has been characterised at 1.6 GPa at room temperature by high-pressure neutron powder and X-ray single-crystal diffraction techniques. This is the first crystalline phase obtained upon compression of liquid nitric acid at room temperature and appears to be the stable phase up to pressures of at least 4 GPa. The crystal structure of this new phase shows some similarities to that of the low-temperature phase of nitric acid at ambient pressure, which has been redetermined as part of this study. Both structures share a herringbone packing of hydrogen-bonded molecular catemers, although the presence of disorder within the hydrogen bonds within one of the catemers of the low-temperature phase makes its structure comparatively more complex.

Graphical abstract: The crystal structures of the low-temperature and high-pressure polymorphs of nitric acid

Supplementary files

Article information


Submitted
13 Nov 2009
Accepted
10 Feb 2010
First published
11 Mar 2010

Dalton Trans., 2010,39, 3736-3743
Article type
Paper

The crystal structures of the low-temperature and high-pressure polymorphs of nitric acid

D. R. Allan, W. G. Marshall, D. J. Francis, I. D. H. Oswald, C. R. Pulham and C. Spanswick, Dalton Trans., 2010, 39, 3736 DOI: 10.1039/B923975H

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