D. James, R. Marshall
1968
Citations
0
Influential Citations
15
Citations
Journal
The Journal of Physical Chemistry
Abstract
Dinitrogen tetroxide has been examined in the liquid and solid states between 77 and 300°K. The nature of the equilibrium NO ⇋ 2NO has been studied in the liquid state, and the concentrations of NO have been determined. The equilibrium constant decreased from 43.54 ± 1.5 mol/l. at 296°K to 0.11 ± 0.01 mol/l. at 247°K, giving ΔH = 15.6 ± 0.5 kcal/mol for the dissociation. When the liquid was quenched to 77°K, an anisotropic set of triplets was observed with g values g = 2.0065, g = 1.9960, g = 2.0029, and g = 2.0018 and hyperfine-splitting constants (in G) A = 50.7, A = 50.1, A = 67.0, and A = 56.0. When the sample was warmed to 180°K, the triplets decreased in intensity and became isotropic with a splitting of 57 G. On recooling, the original anisotropic triplet was recovered. Spectral changes are discussed in terms of solid-state interactions.