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The amount of N2O3 being absorbed in 50-100% H2SO4 at 19, 60, and 95 C is directly proportional to the acid concentration and inversely proportional to the temperature. NO+ formation according to the above-formulated equation occurs only at H2SO4 concentrations greater than 52%. Absorption in highly concentrated sulfuric acid results in the formation of crystalline NOHSO4.
NiC2H10(N2O3)2 crystallizes in the monoclinic C2/c space group. The structure is two-dimensional and consists of two NiC2H10(N2O3)2 sheets oriented in the (0, 0, 1) direction. Ni2+ is bonded in an octahedral geometry to two equivalent N2- and four O2- atoms. Both Ni–N bond lengths are 2.08 Å. There are two shorter (2.04 Å) and two longer (2.17 Å) Ni–O bond lengths. C4+ is bonded in a trigonal planar geometry to one N2- and two O2- atoms. The C–N bond length is 1.37 Å. Both C–O bond lengths are 1.28 Å. There are two inequivalent N2- sites. In the first N2- site, N2- is bonded in a 2-coordinate geometry to one C4+, one N2-, and one H1+ atom. The N–N bond length is 1.41 Å. The N–H bond length is 1.02 Å. In the second N2- site, N2- is bonded in a distorted water-like geometry to one Ni2+, one N2-, and two H1+ atoms. Both N–H bond lengths are 1.03 Å. There are five inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.69 Å) H–O bond length. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.71 Å) H–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ni2+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one C4+ and two H1+ atoms. In the third O2- site, O2- is bonded in a distorted water-like geometry to one Ni2+ and two H1+ atoms.
N2O3 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is zero-dimensional and consists of four nitrous acid molecules and four nitroxyl molecules.
N2O3 is alpha Np structured and crystallizes in the orthorhombic Pnma space group. The structure is zero-dimensional and consists of four ammonia molecules and four nitric acid molecules.
It was found that when (NO)HSO4 is added to absolute H2SO4, specific conductivity rises sharply, possibly due to an increase in mutual interionic effects and viscosity as the (NO)HSO4 concentration rises. The addition of SO3 to the solution yielded a precipitate; a combination of analysis, IR spectroscopy and X-ray diffraction techniques indicated that this precipitate was (NO)HS2O7.
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An investigation of the oxidation of NO to NO2 by trapping the products of the gas-phase reactions with excess oxygen and ozone identified the transient species by their infrared spectra. The primary products of the NO + NO2 reactions were NO2, N2O3(A), N2O3(B), N2O4, and peroxy nitrate (OONO). The primary products of the NO + O3 reactions were NO2 and peroxy NO3 with the higher nitric oxides in low concentrations compared with the NO + O2 reactions. Isotopic oxygen and ozone were used to identify the infrared absorption frequency of the peroxy nitrate.