360570

Sigma-Aldrich

Pyridine

ACS reagent, ≥99.0%

Empirical Formula (Hill Notation):
C5H5N
CAS Number:
Molecular Weight:
79.10
Beilstein/REAXYS Number:
103233
EC Number:
MDL number:
PubChem Substance ID:

Quality Level

grade

ACS reagent

vapor density

2.72 (vs air)

vapor pressure

10 mmHg ( 13.2 °C)
20 mmHg ( 25 °C)

assay

≥99.0%

form

liquid

autoignition temp.

899 °F

expl. lim.

12.4 %

impurities

Reducing substances, passes test
≤0.002% NH3
0.1% water

evapn. residue

≤0.002%

refractive index

n20/D 1.509 (lit.)

pH

8.5 (25 °C, 15.82 g/L)

bp

115 °C (lit.)

mp

−42 °C (lit.)

solubility

water: soluble

density

0.978 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤0.001%
sulfate (SO42-): ≤0.001%

cation traces

Cu: ≤5 ppm

SMILES string

C1=CN=CC=C1

InChI

1S/C5H5N/c1-2-4-6-5-3-1/h1-5H

InChI key

JUJWROOIHBZHMG-UHFFFAOYSA-N

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General description

Pyridine (Pyr) is a nitrogen containing six membered heterocyclic compound commonly used as a base. It is a colorless liquid with a fishy odor. Pyridine moiety is present as a major component in a number of compounds like pyridine nucleotides, pyridine alkaloids, pyridine-based polymers and pyridine-containing macrocycles. It has wide application as a solvent, catalyst and as an intermediate for synthesis. IR, Raman and UV spectra of pyridine has been analyzed and the values obtained were used to calculate its thermodynamic properties. Photodegradation and bacterial degradation of Pyr has been studied.

Application

Pyridine may be used in the synthesis of the following:
  • complexes with cobalt(II) halides
  • pyridine-d5, a deuterated form of pyridine
  • ionic liquid matrices (ILMs)

Packaging

100, 500 mL in glass bottle
1, 2.5, 4×4 L in glass bottle
18 L in steel drum

Pictograms

FlameExclamation mark

Signal Word

Danger

RIDADR

UN1282 - class 3 - PG 2 - Pyridine

WGK Germany

WGK 2

Flash Point(F)

68.0 °F - closed cup

Flash Point(C)

20 °C - closed cup

Certificate of Analysis

Certificate of Origin

Cyclostellettamines AF, pyridine alkaloids which inhibit binding of methyl quinuclidinyl benzilate (QNB) to muscarinic acetylcholine receptors, from the marine sponge, Stelletta maxima.
Fusetani N, et al.
Tetrahedron Letters, 35(23), 3967-3970 (1994)
The vibrational spectrum of pyridine and the thermodynamic properties of pyridine vapors.
Kline Jr CH and Turkevich J.
J. Chem. Phys. , 12(7), 300-309 (1944)
Pyridine coenzymes of subcellular tissue fractions.
Jacobson KB and Kaplan NO.
The Journal of Biological Chemistry, 226(2), 603-613 (1957)
Nickel (II) and copper (II) complexes with pyridine-containing macrocycles bearing an aminopropyl pendant arm: synthesis, characterization, and modifications of the pendant amino group.
Herrera AM, et al.
Dalton Transactions, 5, 846-856 (2003)
Absorption and luminescence of pyridine-based polymers.
Jessen SW, et al.
Synthetic Metals, 84(1), 501-506 (1997)

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