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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):
NO
2
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 (mm
3
/kg): 3.26
Density:
1.491 (0°C, g/cm
3
)
Reactions of synthesis:
[
Ref.1
,
Ref.2
]
Zn + 4HNO
3
(68%) → Zn(NO
3
)
2
+ 2NO
2
+ 2H
2
O
[
Ref.1
]
2NO + O
2
→ 2NO
2
Reactions:
Yeild 93%. [
Ref.1
,
Ref.2
]
2CH
3
COCH
3
+ 2N
2
O
4
→ CH
3
CO[C
2
N
2
O
2
]COCH
3
+ 2H
2
O + 2HNO
2
Yeild 25%. [
Ref.1
]
4(CH
3
)
2
C=NOH + 3N
2
O
4
→ 4(CH
3
)
2
C(NO)NO
2
+ 2H
2
O + 2NO
[
Ref.1
]
Cl
2
O + 2NO
2
→ ClONO
2
+ ClNO
2
[
Ref.1
]
(C
6
H
5
)
2
Hg + N
2
O
4
→ C
6
H
5
HgNO
3
+ C
6
H
5
NO
[
Ref.1
]
KCl + 2NO
2
→ KNO
3
+ NOCl
[
Ref.1
,
Ref.2
]
Cu + 3N
2
O
4
→ Cu(NO
3
)
2
* N
2
O
4
+ 2NO
[
Ref.1
]
3TiCl
4
+ 4N
2
O
4
→ Ti(NO
3
)
4
+ 2(NO)
2
[TiCl
6
]
[
Ref.1
]
TiI
4
+ 4N
2
O
4
→ Ti(NO
3
)
4
+ 4NO + 2I
2
Refractive index (n
D
):
1.42 (20°C)
Electrode potential:
N
2
O
4
+ 2H
+
+ 2e
-
→ 2HNO
2
, E = 1.07 V (water, 20°C)
Permittivity (dielectric constant):
2.42 (15°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
33.5 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
240.2 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
37.5 (g)
Critical temperature (°C):
158.2
Critical pressure (MPa):
10.1
References:
Bell C.F. Syntheses and Physical Studies of Inorganic Compounds. - Pergamon Press, 1972. - pp. 35-48
Binneweis M., Milke E. Thermochemical Data of Elements and Compounds. - 2ed, 2002. - pp. 695
Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.3. - Л.: Химия, 1976. - pp. 109-110 [Russian]
Гутман В. Химия координационных соединений в неводных растворах. - М.: Мир, 1971. - pp. 112-114 [Russian]
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 226 [Russian]
Коттон Ф., Уилкинсон Дж. Современная неорганическая химия. - Ч.2. - М.: Мир, 1969. - pp. 180-182 [Russian]
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 414-415, 422-423 [Russian]
Неорганическая химия. - Под ред. Третьякова Ю.Д., Т.2. - М.: Academa, 2004. - pp. 189-191 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 50 [Russian]
Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 640-641 [Russian]
Справочник азотчика. - М.: Химия, 1987. - pp. 14-17 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 922-925 [Russian]
Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 12-13 [Russian]
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