C5H5N, boiling point 115°C. An organic base with a vile odour. It occurs in a fraction of coal tar, and is carcinogenic. Many alkaloids are pyridine derivatives.
| Pyridine | |
|---|---|
| General | |
| Systematic name | Pyridine |
| Other names |
Azabenzene Azine |
| Molecular formula | C5H5N |
| SMILES | C1=NC=CC=C1 |
| Molecular Weight | 79.10 g/mol |
| Appearance | colourless liquid |
| CAS number | [110-86-1] |
| Properties | |
| Density and phase | 0.9819 g/cm³, liquid |
| Solubility in water | Miscible |
| Solubility in ethanol | Miscible |
| Melting point | −41.6 °C |
| Boiling point | 115.2 °C |
| Viscosity | 0.94 cP at 20 °C |
| Thermodynamic data | |
|
Standard enthalpy of formation ΔfH°liquid |
101.2 kJ/mol |
|
Standard enthalpy of combustion ΔcH°liquid |
−2783.2 kJ/mol |
|
Standard molar entropy S°liquid |
? |
| R-phrases | R11, R20, R21, R22 |
| S-phrases | S2, S26, S28 |
| Flash point | 20 °C |
| Supplementary data page | |
|
Structure and properties |
n, εr, etc. |
|
Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Regulatory data |
Flash point, RTECS number, etc. |
| Related compounds | |
| Related amines |
Picoline Quinoline |
| Related compounds |
Aniline Pyrimidine |
|
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
Pyridine is a chemical compound with the formula C5H5N.
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