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Properties of substance:

nitrogen(IV) oxide

Synonyms:

nitrogen dioxide

Group of substances:

inorganic

Physical appearance:

liquid

Empirical formula (Hill's system for organic substances):

NO2

Structural formula as text:

NO2

Molar/atomic mass: 46.01

Melting point (°C):

-11.2

Boiling point (°C):

21

Decomposition temperature (°C):

140-620

Solubility (g/100 g of solvent):

carbon disulphide: soluble [Ref.]
chloroform: soluble [Ref.]
dimethylsulfoxide: very soluble [Ref.]
nitrobenzene: soluble [Ref.]
nitromethane: miscible [Ref.]
oxygen liquid: 0.0022 (-182.8°C) [Ref.]
tetrachlorosilane: miscible [Ref.]
tributyl phosphate: soluble [Ref.]
water: reaction [Ref.]

Properties of solutions:

18% (wt.), solvent - nitric acid
  Freezing point (°C) = -73.
30% (wt.), solvent - nitric acid
  Freezing point (°C) = -58.5

Interatomic distances and bond angles:

Interatomic distances (in pm): 119,7 (N-O, для NO2) [gas]
Bond angles (in degrees): 134,25 (O-N-O, для NO2) [gas]

Numerical data:

Magnetic susceptibility (mm3/kg): 3.26

Density:

1.491 (0°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1, Ref.2]
    Zn + 4HNO3 (68%) → Zn(NO3)2 + 2NO2 + 2H2O
  2. [Ref.1]
    2NO + O2 → 2NO2

Reactions:

  1. Yeild 93%. [Ref.1, Ref.2]
    2CH3COCH3 + 2N2O4 → CH3CO[C2N2O2]COCH3 + 2H2O + 2HNO2
  2. Yeild 25%. [Ref.1aster]
    4(CH3)2C=NOH + 3N2O4 → 4(CH3)2C(NO)NO2 + 2H2O + 2NO
  3. [Ref.1]
    Cl2O + 2NO2 → ClONO2 + ClNO2
  4. [Ref.1aster]
    (C6H5)2Hg + N2O4 → C6H5HgNO3 + C6H5NO
  5. [Ref.1]
    KCl + 2NO2 → KNO3 + NOCl
  6. [Ref.1, Ref.2]
    Cu + 3N2O4 → Cu(NO3)2 * N2O4 + 2NO
  7. [Ref.1]
    3TiCl4 + 4N2O4 → Ti(NO3)4 + 2(NO)2[TiCl6]
  8. [Ref.1]
    TiI4 + 4N2O4 → Ti(NO3)4 + 4NO + 2I2

Refractive index (nD):

1.42 (20°C)

Electrode potential:

N2O4 + 2H+ + 2e- → 2HNO2, E = 1.07 V (water, 20°C)

Permittivity (dielectric constant):

2.42 (15°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

33.5 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

240.2 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

37.5 (g)

Critical temperature (°C):

158.2

Critical pressure (MPa):

10.1

References:

  1. Bell C.F. Syntheses and Physical Studies of Inorganic Compounds. - Pergamon Press, 1972. - pp. 35-48
  2. Binneweis M., Milke E. Thermochemical Data of Elements and Compounds. - 2ed, 2002. - pp. 695
  3. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.3. - Л.: Химия, 1976. - pp. 109-110 [Russian]
  4. Гутман В. Химия координационных соединений в неводных растворах. - М.: Мир, 1971. - pp. 112-114 [Russian]
  5. Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 226 [Russian]
  6. Коттон Ф., Уилкинсон Дж. Современная неорганическая химия. - Ч.2. - М.: Мир, 1969. - pp. 180-182 [Russian]
  7. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 414-415, 422-423 [Russian]
  8. Неорганическая химия. - Под ред. Третьякова Ю.Д., Т.2. - М.: Academa, 2004. - pp. 189-191 [Russian]
  9. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 50 [Russian]
  10. Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 640-641 [Russian]
  11. Справочник азотчика. - М.: Химия, 1987. - pp. 14-17 [Russian]
  12. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 922-925 [Russian]
  13. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 12-13 [Russian]
  14. Химмотология ракетных и реактивных топлив. - Под ред. Браткова А.А. - М.: Химия, 1987. - pp. 66-72 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru