Abstract
The orientation, structure, and location of nitric oxide (NO) generated by low-temperature photolysis in single crystals of two nitramines, RDX and HNIW, have been investigated by EPR spectroscopy. Following low-temperature photolysis of single crystals of RDX and of the α- and /?-polymorphs of HNIW, various NO species were observed after annealing up to 300 K. The orientation and orbital degeneracy of NO trapped in crystal lattices of these nitramines were inferred from its g tensor. These data illustrate the use of NO as a probe of reaction-generated stress in single crystals. In addition, analyses of α- and β-HNIW crystal packing and of the orientation and structural differences of NO trapped therein, were used to locate the NO within the α-HNIW crystal lattice, where it is shown to be trapped in intermolecular cavities and to survive storage for over 2 years at ambient temperature.
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