Pyridine (data page)

Last updated April 12, 2023

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, n_D	1.509 at 20 °C
Abbe number	?
Dielectric constant, ε_r	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, Δ_fusH^o	8.28 kJ/mol
Std entropy change of fusion, Δ_fusS^o	35.8 J/(mol·K)
Std enthalpy change of vaporization, Δ_vapH^o	40.2 kJ/mol
Std entropy change of vaporization, Δ_vapS^o	? J/(mol·K)
Solid properties
Std enthalpy change of formation, Δ_fH^o_solid	? kJ/mol
Standard molar entropy, S^o_solid	? J/(mol K)
Heat capacity, c_p	? J/(mol K)
Liquid properties
Std enthalpy change of formation, Δ_fH^o_liquid	100 kJ/mol
Standard molar entropy, S^o_liquid	177 J/(mol K)
Enthalpy of combustion, Δ_cH^o	–2782 kJ/mol
Heat capacity, c_p	132.72 J/(mol K)
Gas properties
Std enthalpy change of formation, Δ_fH^o_gas	140 kJ/mol at 25 °C
Standard molar entropy, S^o_gas	? J/(mol K) at 25 °C
Heat capacity, c_p^[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:
log
e
[?]
P
m
m
H
g
=
{\displaystyle \scriptstyle \log _{e}P_{mmHg}=}
log
e
[?]
(
760
101.325
)
-
8.907666
log
e
[?]
(
T
+
273.15
)
-
7221.386
T
+
273.15
+
75.52152
+
5.304278
x
10
-
06
(
T
+
273.15
)
2
{\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 LogPyridineVaporPressure.png — **log₁₀ of Pyridine vapor pressure.** Uses formula: $\scriptstyle \log _{e}P_{mmHg}=$ $\scriptstyle \log _{e}({\frac {760}{101.325}})-8.907666\log _{e}(T+273.15)-{\frac {7221.386}{T+273.15}}+75.52152+5.304278\times 10^{-06}(T+273.15)^{2}$ obtained from CHERIC

Spectral data

UV-Vis
λ_max	? 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:

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

References

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

Linstrom, Peter (1997). "NIST Standard Reference Database". National Institute of Standards and Technology. doi:10.18434/T4D303 . Retrieved 20 May 2007.{{cite journal}}: Cite journal requires |journal= (help)

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[lange1661-1] Lange's Handbook of Chemistry, 10th ed. pp 1661-1663

[crc2258-2] CRC Handbook of Chemistry and Physics, 44th ed. pp 2258-2263

[cheric_p-3] 1 2 "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 20 May 2007.

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