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Properties of substance:
pyridine
skc-file
Group of substances:
organic
Physical appearance:
colorless liquid
Empirical formula (Hill's system for organic substances):
C
5
H
5
N
Molar/atomic mass: 79.11
Melting point (°C):
-41.8
Boiling point (°C):
115.3
Solubility (g/100 g of solvent):
acetone
: soluble [
Ref.
]
ammonia liquid
: miscible [
Ref.
]
benzene
: soluble [
Ref.
]
chloroform
: soluble [
Ref.
]
diethyl ether
: miscible [
Ref.
]
ethanol
: miscible [
Ref.
]
hydrogen fluoride
: very soluble [
Ref.
]
iodine monochloride
: soluble [
Ref.
]
sulfolane
: miscible [
Ref.
]
water
: miscible [
Ref.
]
Density:
0.9819 (20°C, g/cm
3
)
Reactions:
[
Ref.1
]
C
6
H
5
COCH
3
+ I
2
+ 2C
5
H
5
N → [C
6
H
5
COCH
2
NC
5
H
5
]I + C
5
H
5
NHI
Refractive index (n
D
):
1.5095 (20°C)
Vapour pressure (Torr):
10 (13.2°C)
100 (57.8°C)
200 (75°C)
600 (95.6°C)
Dissociation:
pK
BH
+
(1) = 5.23 (25°C, water)
pK
BH
+
(1) = 4.48 (20°C, formamide)
Retention indices for gas chromatography:
739,1 (phase - DB-5, temperature-programmed conditions, 6 K/min)
738 (phase - OV-101, 110°C)
Permittivity (dielectric constant):
12.3 (25°C)
Dipole moment (D):
2.19 (20°C)
Viscosity (mPa·s):
0.974 (20°C)
Surface tension (mN/m):
38 (20°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
100.2 (l)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
132.7 (l)
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
35.54
Heat of combustion (kJ/mol):
2868.1
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
140.4 (g)
Critical temperature (°C):
346.8
Critical pressure (MPa):
5.63
References:
Dictionary of organic compounds. - Vol. 3, naphthacarbazole - zygadenine. - М.: ИИЛ, 1949. - pp. 552-553
Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 286-290
Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.2. - Л.: Химия, 1976. - pp. 444 [Russian]
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 556 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 173, 225 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 411-412 [Russian]
Химия: справочное руководство. - Под ред. Гаврюченкова Ф.Г., Курочкиной М.И. и др. - Л.: Химия, 1975. - pp. 372-375 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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