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Properties of substance:
krypton difluoride
Group of substances:
inorganic
Physical appearance:
colorless tetragonal crystals
Empirical formula (Hill's system for organic substances):
F
2
Kr
Structural formula as text:
KrF2
Molar/atomic mass: 121.8
Decomposition temperature (°C):
20
CAS №: 13773-81-4
Solubility (g/100 g of solvent):
bromine pentafluoride
: 81 (20°C) [
Ref.
]
hydrogen fluoride
: 195 (20°C) [
Ref.
]
Interatomic distances and bond angles:
Interatomic distances (in pm): 188,9 (Kr-F (233 K)) [gas]
Interatomic distances (in pm): 189,4 (Kr-F (148 K)) [α-form]
Interatomic distances (in pm): 189,2 (Kr-F (193 K)) [β-form]
Density:
3.3 (-73°C, g/cm
3
)
Reactions of synthesis:
[
Ref.1
]
Kr + F
2
→ KrF
2
[
Ref.1
]
Kr + F
2
→ KrF
2
Reactions:
[
Ref.1
]
7KrF
2
+ 2Au → 2KrF[AuF
6
] + 5Kr
Yeild 11,15%. [
Ref.1
]
KrF
2
+ ClF
5
+ AsF
5
→ (ClF
6
)[AsF
6
] + Kr
Half-life:
= 30 sек (при 110 С)
= 120 sек (при 80 С)
Vapour pressure (Torr):
10 (-15.5°C)
30 (0°C)
73 (15°C)
ΔH
sublimation
(kJ/mol):
37
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
15.5 (s)
Standard molar enthalpy (heat) of formation Δ
f
H (298 K, kJ/mol)
60.2 (g) [
Ref.
]
Standard molar entropy S (298 K, J/(mol·K))
253.6 (g) [
Ref.
]
Molar heat capacity at constant pressure C
p
(298 K, J/(mol·K))
54.2 (g) [
Ref.
]
References:
CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-69
Lehmann J.F., Mercier H.P.A., Schrobilgen G.J. The chemistry of krypton / Coordination Chemistry Reviews. - 2002. - Vol. 233-234. - pp. 3-12, 29-35 [DOI:
10.1016/S0010-8545(02)00202-3
]
Holleman A.F., Wiberg E., Wiberg N. Lehrbuch der Anorganischen Chemie. - Berlin: Walter de Gruyter, 1995. - pp. 428
Housecroft C.E., Sharpe A.G. Inorganic Chemistry. - 2ed. - 2005. - pp. 501
Janiak C., Klapotke T.M., Meyer H.-J. Moderne Anorganische Chemie. - Berlin: Walter de Gruyter, 2003. - pp. 59-60
Journal of Fluorine Chemistry. - 1975. - Vol. 5, №3. - pp. 273-274
Journal of the American Chemical Society. - 1966. - Vol. 88, No. 24. - pp. 5924
Nakajima T., Zemva B., Tressaud A. Advanced inorganic fluorides: Syntesis, Characterization and Applications. - Elsevier, 2000. - pp. 22
Progress in inorganic chemistry. - Vol. 29. - John Wiley & Sons, 1982. - pp. 188, 190-191
Soviet Atomic Energy. - 1971. - Vol. 31, No. 3. - pp. 990-999 [DOI:
10.1007/BF01375764
]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 75 [Russian]
Спицын В.И., Мартыненко Л.И. Неорганическая химия. - Ч.1. - М.: ИМУ, 1991. - pp. 233 [Russian]
Термодинамические свойства индивидуальных веществ. - Т.1, Кн.2. - М.: Наука, 1978. - pp. 152 [Russian]
Успехи химии. - 1974. - Т.43, №12. - pp. 2167, 2176-2179 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 523-524 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru