13587-52-5Relevant articles and documents
Infrared Spectra of Solid Films Formed from Vapors Containing Water and Nitric acid
Smith, Roland H.,Ming-Taun, Leu,Keyser, Leon F.
, p. 5924 - 5930 (1991)
Infrared spectra have been recorded at 188 K for crystalline mono- and trihydrates of nitric acid formed by vapor deposition.In addition, spectra of fully deuterated forms of these same compounds have been obtained.These spectra have been interpreted in terms of the known ionic structures of the hydrates and the known spectra of oxonium and nitrate ions.Two other less stable solids were formed, a molecular hydrogen-bonded HNO3*H2O complex, stable only at temperatures below 120 or 150 K, and a substance thought to be a crystalline mixture of trihydrate and ice which sometimes formed from water-rich vapors and which upon pumping and/or warming could be converted into crystalline trihydrate.While these four substances appear to be the four species recently reported by Ritzhaupt and Devlin, we disagree with their allocation of structures to two of them.In particular, we disagree with their claims that a stable dihydrate exists.The relevance of the results to the stratosperic ozone hole problem is discussed.
AgNO3?NH4NO3 – an enigmatic double-salt type “decomposition intermediate” of diamminesilver(I) permanganate
Béres, Kende Attila,Petru?evski, Vladimir,Holló, Berta Barta,Németh, Péter,Foga?a, Lara,Paiva Franguelli, Fernanda,Farkas, Attila,Menyhárd, Alfréd,Szilágyi, Imre Miklós,Kótai, László
, p. 1166 - 1174 (2021)
The 1 : 1 type double salt of AgNO3 and NH4NO3 (NH4NO3 ? AgNO3, compound 1) was prepared and its Raman spectrum was evaluated. IR and far-IR spectra of compound 1 and its deuterated analog (ND4NO3 ? AgNO3, compound 1-D) were also studied. We identified two types of nitrate ions, one had a relatively strong, whereas the other is only weakly hydrogen bonded to the surrounding ammonium ions. The thermal decomposition features of compound 1 and its formation mechanism from [Ag(NH3)2]MnO4 (compound 2) at 80 °C with consecutive aqueous leaching of the decomposition residue has been elucidated. The solid phase decomposition product of compound 2 is presumably [Ag(NH3)NO3] (compound 3), which disproportionates into AgNO3 and [Ag(NH3)2]NO3 (compound 4). Compound 4 thermally decomposes in the solid phase into Ag+MnOx, while in aqueous solution its hydrolysis results in NH4NO3, which crystallizes out with an equimolar amount of AgNO3 formed during the disproportionation as compound 1.
The crystal structures of the low-temperature and high-pressure polymorphs of nitric acid
Allan,Marshall,Francis,Oswald,Pulham,Spanswick
, p. 3736 - 3743 (2010)
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.
Absorption and Oxidation of Nitrogen Oxide in Ionic Liquids
Kunov-Kruse, Andreas J.,Thomassen, Peter L.,Riisager, Anders,Mossin, Susanne,Fehrmann, Rasmus
, p. 11745 - 11755 (2016)
A new strategy for capturing nitrogen oxide, NO, from the gas phase is presented. Dilute NO gas is removed from the gas phase by ionic liquids under ambient conditions. The nitrate anion of the ionic liquid catalyzes the oxidation of NO to nitric acid by atmospheric oxygen in the presence of water. The nitric acid is absorbed in the ionic liquid up to approximately one mole HNO3per mole of the ionic liquid due to the formation of hydrogen bonds. The nitric acid can be desorbed by heating, thereby regenerating the ionic liquid with excellent reproducibility. Here, time-resolved in-situ spectroscopic investigations of the reaction and products are presented. The procedure reveals a new vision for removing the pollutant NO by absorption into a non-volatile liquid and converting it into a useful bulk chemical, that is, HNO3.
Microwave spectrum of DNO3, and average structures of nitric and nitrous acids
Cox, A. P.,Ellis, M. C.,Attfield, C. J.,Ferris, A. C.
, p. 91 - 106 (1994)
The rotational spectrum of DNO3 in the ground vibrational state has been investigated in the region 16-40 GHz and analysed to give rotational constants and centrifugal distortion constants.Microwave data for eight isotopomers of HNO3 have been used to der
