Spectra and molecular structure of nitric acid in solutions

Genich, A. P.; Erëmenko, L. T.; Nikitina, L.

doi:10.1007/bf00915645

Cited by 4 publications

(2 citation statements)

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“…The N 2 O 4 and NO 2 absorption bands essentially disappear upon addition of 0.1% H 2 O, indicating conversion of N 2 O 4 and NO 2 to HNO 2 and HNO 3 . Undissociated HNO 3 shows an absorption maximum at ∼260 nm, which derives from an n → π* transition. − This absorption band decreases in intensity as the water concentration increases, indicating HNO 3 dissociation, which agrees with the UVRR spectra that show intense bands of NO 3 – . HNO 2 shows distinct absorption bands between ∼300–400 nm (Figure ).…”

Section: Resultssupporting

confidence: 74%

UV Resonance Raman Investigation of Pentaerythritol Tetranitrate Solution Photochemistry and Photoproduct Hydrolysis

2017

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Ultraviolet resonance Raman spectroscopy (UVRR) is being developed for standoff trace explosives detection. To accomplish this, it is important to develop a deep understanding of the accompanying UV excited photochemistry of explosives, as well as the impact of reactions on the resulting photoproducts. In the work here we used 229 nm excited UVRR spectroscopy to monitor the photochemistry of pentaerythritol tetranitrate (PETN) in acetonitrile. We find that solutions of PETN in CDCN photodegrade with a quantum yield of 0.08 ± 0.02, as measured by high performance liquid chromatography (HPLC). The initial step in the 229 nm UV photolysis of PETN in CDCN is cleavage of an O-NO bond to form NO. The accompanying photoproduct is pentaerythritol trinitrate (PETriN), (CHONO)CCHOH formed by photolysis of a single O-NO. The resulting UVRR spectra show a dominant photoproduct band at ∼1308 cm, which derives from the symmetric stretch of dissolved NO. This photoproduct NO is hydrolyzed by trace amounts of water, which downshifts this 1308 cm NO Raman band due to the formation of molecular HNO. The dissociation of HNO to NO in the presence of additional water results in an intense NO- symmetric stretching UVRR band at 1044 cm.

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Section: Resultssupporting

confidence: 74%

UV Resonance Raman Investigation of Pentaerythritol Tetranitrate Solution Photochemistry and Photoproduct Hydrolysis

2017

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“…Other types of studies on complexes include investigation polymerization of titanium (IV) in chloride solutions (283), determination of the relative stability of eight metal ions bound with conalbumin (364), investigation of a ribonuclease A-inhibitor complex ( 189), a study of the antihistamine properties of thyrocalcitonin through complexes (359), comparison of charge-transfer complexes in solution and in the gas phase (232), a study of the hypsochromic shift of the spectra of phenylglyoxylic acid in polar solvents (179), interaction of some polar solvents with chloranil in carbon tetrachloride (353), and the determination of the energies of formation of complexes of benzoic acid with ethers by measuring changes in absorbance with temperature (101). Other investigations include pyridine addition compounds (173), complexes of sulfur dioxide with polar compounds (100), amides with nitrobenzenes and benzaldehyde (38), halogenated aromatic amines with dinitrobenzenes (378), nitric acid with acetic (146), and iodine in hydrocarbon solvents (204) An empirical method for obtaining dissociation energies of iodine complexes was described (231). A description of the ultraviolet spectrophotometric method was included in an article on methods of studying hydrogen bonding in nonaqueous systems (177).…”

Section: Complexesmentioning

confidence: 99%