Pyridine (data page)
# 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, $n_D$ | 1.509 at 20 °C |
| - | - |
| Abbe number | ? |
| Dielectric constant, $ε_r$ | 12.3 $ε_0$ at 25 °C |
| Bond strength | ? |
| Bond length | ? |
| Bond angle | ? |
| Magnetic susceptibility | ? |
| Surface tension | 40.8 dyn/cm at 0 °C 38.0 dyn/cm at 20 °C 26.4 dyn/cm at 100 °C |
| Viscosity | 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, $Δ_{fus}H^o$ | 8.28 kJ/mol |
| Std entropy change of fusion, $Δ_{fus}S^o$ | 35.8 J/(mol·K) |
| Std enthalpy change of vaporization, $Δ_{vap}H^o$ | 40.2 kJ/mol |
| Std entropy change of vaporization, $Δ_{vap}S^o$ | ? 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, $c_p$ | 157.8 J/(mol K) at 25 °C |

## Vapor pressure of liquid

| P in mm Hg | P in mm Hg | 1 | 10 | 40 | 100 | 400 | 760 |
| - | - | - | - | - | - | - | - |
| T in °C | 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 :

| $λ_{max}$ | ? nm |
| - | - |
| Extinction coefficient, ε | ? |
| IR ||
| Major absorption bands | ? $cm^{−1}$ |
| NMR ||
| Proton NMR | |
| Carbon-13 NMR | |
| Other NMR data | |
| MS ||
| Masses of main fragments | |

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