Pyridine (data Page)
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This page provides supplementary chemical data on pyridine.

Material Safety Data Sheet

The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as MSDS Search Engine, and follow its directions. MSDS is available from Sigma - Aldrich.

Structure and properties

Structure and properties
Index of refraction, nD 1.509 at 20 °C
Abbe number ?
Dielectric constant, ?r 12.3 ?0 at 25 °C
Bond strength ?
Bond length ?
Bond angle ?
Magnetic susceptibility ?
Surface tension[1] 40.8 dyn/cm at 0 °C
38.0 dyn/cm at 20 °C
26.4 dyn/cm at 100 °C
Viscosity[2] 0.974 mPa·s at 20 °C

Thermodynamic properties

Phase behavior
Triple point 231.48 K (-41.67 °C), ? Pa
Critical point 619 K (346 °C), 5660 Pa
Std enthalpy change
of fusion
, ?fusHo
8.28 kJ/mol
Std entropy change
of fusion
, ?fusSo
35.8 J/(mol·K)
Std enthalpy change
of vaporization
, ?vapHo
40.2 kJ/mol
Std entropy change
of vaporization
, ?vapSo
? J/(mol·K)
Solid properties
Std enthalpy change
of formation
, ?fHosolid
? kJ/mol
Standard molar entropy,
? J/(mol K)
Heat capacity, cp ? J/(mol K)
Liquid properties
Std enthalpy change
of formation
, ?fHoliquid
100 kJ/mol
Standard molar entropy,
177 J/(mol K)
Enthalpy of combustion, ?cHo -2782 kJ/mol
Heat capacity, cp 132.72 J/(mol K)
Gas properties
Std enthalpy change
of formation
, ?fHogas
140 kJ/mol at 25 °C
Standard molar entropy,
? J/(mol K) at 25 °C
Heat capacity, cp[3] 157.8 J/(mol K) at 25 °C

Vapor pressure of liquid

P in mm Hg 1 10 40 100 400 760
T in °C -18.9 13.2 38.0 57.8 95.6 115.4

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.

log10 of Pyridine vapor pressure. Uses formula: obtained from CHERIC[3]

Spectral data

?max ? nm
Extinction coefficient, ? ?
Major absorption bands ? cm−1
Proton NMR  
Carbon-13 NMR  
Other NMR data  
Masses of
main fragments


  1. ^ Lange's Handbook of Chemistry, 10th ed. pp 1661-1663
  2. ^ CRC Handbook of Chemistry and Physics, 44th ed. pp 2258-2263
  3. ^ a b "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 2007.

Except where noted otherwise, data relate to standard ambient temperature and pressure.

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