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Properties of substance:
oxygen difluoride
Synonyms:
fluorine monoxide
oxygen fluoride
Group of substances:
inorganic
Physical appearance:
colorless gas
Empirical formula (Hill's system for organic substances):
F
2
O
Structural formula as text:
OF2
Molar/atomic mass: 53.996
Melting point (°C):
-223.8
Boiling point (°C):
-145
Decomposition temperature (°C):
200
Solubility (g/100 g of solvent):
fluorine liquid
: miscible [
Ref.
]
oxygen liquid
: miscible [
Ref.
]
ozone liquid
: miscible [
Ref.
]
water
: 0.0164 (0°C) [
Ref.
]
Interatomic distances and bond angles:
Interatomic distances (in pm): 140,5 (O-F) [gas]
Bond angles (in degrees): 103 (F-O-F) [gas]
Numerical data:
Year of discovery: 1927
LCt50 (mg·min/l): 0.199
LCt50 (mg·min/l): 0.345
Density:
1.9 (-223.8°C, g/cm
3
)
Reactions of synthesis:
[
Ref.1
,
Ref.2
]
2F
2
+ 2NaOH → 2NaF + OF
2
+ H
2
O
Reactions:
Yeild 100%. [
Ref.1
]
OF
2
+ SO
3
→ FSO
2
OOF
Yeild 80%. [
Ref.1
]
4OF
2
+ 2AsF
5
→ 2O
2
AsF
6
+ 3F
2
Yeild 90%. [
Ref.1
]
COF
2
+ 2OF
2
→ CF
3
OOOCF
3
Vapour pressure (Torr):
1 (-196°C)
10 (-184°C)
100 (-167°C)
Electrode potential:
OF
2
+ 2H
+
+ 4e
-
→ 2F
-
+ H
2
O, E = 2.1 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
25.1 (g)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
42.5 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
246.98 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
43.3 (g)
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
11.09
Critical temperature (°C):
-58
Critical pressure (MPa):
4.95
Critical density (g/cm
3
):
0.553
References:
Advances in Inorganic Chemistry and Radiochemistry. - 1963. - Vol. 5. - pp. 43-44
Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 109-111
Simons J.H. Fluorine Chemistry. - Vol. 5. - New York: Academic Press, 1964. - pp. 63-64
Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 593 [Russian]
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 140-141 [Russian]
Зрелов В.Н., Серегин Е.П. Жидкие ракетные топлива. - М.: Химия, 1975. - pp. 268-270 [Russian]
Никитин И.В. Химия кислородных соединений галогенов. - М.: Наука, 1986 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 73, 315 [Russian]
Рысс И.Г. Химия фтора и его неорганических соединений. - М., 1956. - pp. 150-153 [Russian]
Успехи химии. - 1971. - Т.40, №11. - pp. 1914-1918 [Russian]
Фтор и его соединения. – Под ред. Саймонса Дж., Т. 1. - М.: ИИЛ, 1953. - pp. 73-75 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 389 [Russian]
Химмотология ракетных и реактивных топлив. - Под ред. Браткова А.А. - М.: Химия, 1987. - pp. 76-77 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru