Experimental determination and prediction of the vapor pressure of some binary and quaternary aqueous solutions of alkaline nitrites and nitrates

Vapor pressure of H₂O + NaNO₃ and H₂O + NaNO₂ solutions were measured with static method from 298.1 to 353.1 K in a range of salt mass fractions between 0.05 and 0.50. As well, the vapor pressure was determined for quaternary mixtures LiNO₃ + NaNO₃ + KNO₃ + H₂O (salt mass ratio 53:5:42) and LiNO₃ + KNO₃ + NaNO₂ + H₂O (salt mass ratio 53:35:12) from 313.1 to 353.1 K and total salt mass fraction of 0.30, 0.40 and 0.50. The experimental vapor pressure data of binary systems were correlated with the temperature and the liquid-phase composition using an analytical polynomial equation. The capability of the electrolyte non-random two liquid model (Electrolyte-NRTL) to predict the vapor–liquid equilibrium was evaluated by comparing predicted and experimental data of the mixtures studied in this work.     

Ring opening of aziridines with tetranitromethane in the presence of triethylamine. Efficient synthesis of β-tosylamino nitrates

A convenient method for the preparation of β-tosylamino nitrates based on the ring-opening reaction of aziridines by tetranitromethane in the presence of triethylamine is described. A series of substituted β-amino nitrates is obtained in high yields under mild conditions.     

Influence of the temperature and phase state of K,Ca/NO<Subscript>3</Subscript> and K,Mg/NO<Subscript>3</Subscript> binary systems on the vibrational anharmonicity and orientational mobility of the nitrate ion

The absorption spectra of homogeneous and heterophase melts and glasses of the K,Ca/NO₃ and K,Mg/NO₃ systems are studied by IR Fourier spectroscopy. The temperature-phase dependences for the first and second order spectra are analyzed, and the anharmonicity constants for internal vibrations of the nitrate ion are estimated. The influence of finely dispersed Al₂O₃ powder on the structural-dynamic properties of the K,Ca/NO₃ and K,Mg/NO₃ systems is studied. A mechanism for charge transfer in heterophase nitrate glasses is proposed. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 2, pp. 176–181, March–April 2009.     

The Contours of the Bands of the Structural Luminescence and Absorption Spectra of Solid Solutions and Crystals of Uranyl Compounds at Low Temperatures

Temperature evolution of the fine structure of the electronic spectra of uranyl nitrates and fluorides is considered. It is shown that for pure crystals at T = 4.2 K the contour is described by the Lorentz curve; for other cases a convolution of the type of the Voigt function is typical. Weak electron–phonon interaction leads to temperature broadening of spectra predominantly due to the Boltzmann change in the population of the initial electronic–vibrational states.     

Reactivity and transformation routes of surface nitrates in the reaction of NOx reduction by C3H8 over cation-exchanged zeolites

FITRS combined with¹⁵N and¹⁸O isotope substitution and TPD have revealed that nitrates are the most abundant ad-NO_x species on over-exchanged Cu- and Co-ZSM-5 zeolites. the transformation rates of such species under the action of a propane—oxygen mixture were found to be comparable and sufficiently high to afford steady-state catalytic activities. A scheme of the reaction mechanism including C, N-containing intermediates detected in work is suggested.     

Interaction of trimethylsilyl ions with nitrates of the estrane series in the gas phase

The interaction of trimethylsilyl ions with nitrates of the estrane series affords the adducts [M + SiMe₃]⁺, whose fragmentation proceeds through the elimination of the functional groups either along with the trimethylsilyl residue, or in the form of molecules containing no SiMe₃.     

Dry Diazonium Nitrates from Aromatic Amines and Tributyl Phosphate‐NO2 Adduct

Aromatic amines reacted with TBP‐NO₂ adduct to give dry aryl diazonium nitrate in high purity and yield.     

Extraction of Uranium(VI) by Triphenylarsine and Triphenylphosphine Oxides from Nitric Acid Medium

The extraction of UO²⁺ ₂ from nitric acid solutions by two neutral donors ligands (L), triphenylarsine oxide (Ph₃AsO) and triphenylphosphine oxide (Ph₃PO), in chloroform is investigated. At low HNO₃ acid concentrations (<2 M), UO₂ ²⁺ is highly extracted as simple cation by Ph₃AsO and slightly extracted by Ph₃PO. The extraction constant of UO₂ ²⁺ from low nitric acid medium is found to equal 1212 ± 120. At higher HNO₃ concentration (>2 M), UO₂ ²⁺ is extracted by ion association mechanism as UO₂ (NO₃)₂- 2L, and the distribution ratio of UO₂ ²⁺ using Ph₃PO is found to be higher than that of Ph₃AsO. This is interpreted by the extraction competition of HNO₃ for Ph₃AsO. Spectroscopic investigations in the visible and IR regions supported the results obtained.