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 tensionLange's Handbook of Chemistry, 10th ed. pp 1661-1663 40.8 dyn/cm at 0 °C38.0 dyn/cm at 20 °C26.4 dyn/cm at 100 °C ViscosityCRC Handbook of Chemistry and Physics, 44th ed. pp 2258-2263 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 changeof fusion, ΔfusHo 8.28 kJ/mol Std entropy changeof fusion, ΔfusSo 35.8 J/(mol·K) Std enthalpy changeof vaporization, ΔvapHo 40.2 kJ/mol Std entropy changeof vaporization, ΔvapSo ? J/(mol·K) Solid properties Std enthalpy changeof formation, ΔfHosolid ? kJ/mol Standard molar entropy,Sosolid ? J/(mol K) Heat capacity, cp ? J/(mol K) Liquid properties Std enthalpy changeof 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 changeof formation, ΔfHogas 140 kJ/mol at 25 °C Standard molar entropy,Sogas ? J/(mol K) at 25 °C Heat capacity, cp 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.
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
References