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 eChemPortal, 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, 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

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,
Sosolid		  ? J/(mol K)
Heat capacity, cp  ? J/(mol K)
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		 100 kJ/mol
Standard molar entropy,
Soliquid		 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,
Sogas		  ? 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 Hg11040100400760
T in °C–18.913.238.057.895.6115.4

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

UV-Vis
λmax  ? nm
Extinction coefficient, ε  ?
IR
Major absorption bands  ? cm−1
NMR
Proton NMR  
Carbon-13 NMR  
Other NMR data  
MS
Masses of
main fragments		  
  This box:   

References

  1. ↑ Lange's Handbook of Chemistry, 10th ed. pp 1661-1663
  2. ↑ CRC Handbook of Chemistry and Physics, 44th ed. pp 2258-2263
  3. 1 2 "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 20 May 2007.

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