Pyridine (data page)

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 eChemPortal, and follow its directions. MSDS is available from Sigma - Aldrich.

Structure and properties[edit]

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[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, 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[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: $\scriptstyle \log _{e}P_{mmHg}=$ $\scriptstyle \log _{e}({\frac {760}{101.325}})-8.907666\log _{e}(T+273.15)-{\frac {7221.386}{T+273.15}}+75.52152+5.304278\times 10^{-06}(T+273.15)^{2}$ obtained from CHERIC^[3]

Spectral data[edit]

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[edit]

^ Lange's Handbook of Chemistry, 10th ed. pp 1661-1663
^ CRC Handbook of Chemistry and Physics, 44th ed. pp 2258-2263
^ ^a ^b "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)

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

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