Pyridine (data page)

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This page provides supplementary chemical data on pyridine.

Material Safety Data Sheet[edit]

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[edit]

Structure and properties
Index of refraction, nD 1.509 at 20°C
Abbe number ?
Dielectric constant, εr 12.3 ε0 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[edit]

Phase behavior
Triple point 231.48 K (–41.67 °C), ? Pa
Critical point 619 K (346 °C), 5660 Pa
Std enthalpy change
of fusion
, ΔfusHo
8.28 kJ/mol
Std entropy change
of fusion
, ΔfusSo
35.8 J/(mol·K)
Std enthalpy change
of vaporization
, ΔvapHo
40.2 kJ/mol
Std entropy change
of vaporization
, ΔvapSo
 ? J/(mol·K)
Solid properties
Std enthalpy change
of formation
, ΔfHosolid
 ? kJ/mol
Standard molar entropy,
 ? J/(mol K)
Heat capacity, cp  ? J/(mol K)
Liquid properties
Std enthalpy change
of formation
, ΔfHoliquid
100 kJ/mol
Standard molar entropy,
177 J/(mol K)
Enthalpy of combustion, ΔcHo –2782 kJ/mol
Heat capacity, cp 132.72 J/(mol K)
Gas properties
Std enthalpy change
of formation
, ΔfHogas
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[edit]

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[edit]

λmax  ? nm
Extinction coefficient, ε  ?
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 20 May 2007. 

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

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