Pyridine (data page)

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 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: ${\displaystyle \scriptstyle \log _{e}P_{mmHg}=}$${\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-8.907666\log _{e}(T+273.15)-{\frac {7221.386}{T+273.15}}+75.52152+5.304278\times 10^{-06}(T+273.15)^{2}}$ 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

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• Except where noted otherwise, data relate to Standard temperature and pressure.
• Reliability of data general note.