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676772

Sigma-Aldrich

Pyridine

ACS reagent, ≥99.0%

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

grade

ACS reagent

Quality Level

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

≤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,[07] pyridine alkaloids,[08] pyridine-based polymers[09] and pyridine-containing macrocycles.[10] It has wide application as a solvent, catalyst and as an intermediate for synthesis.[76] IR, Raman and UV spectra of pyridine have been analyzed and the values obtained were used to calculate its thermodynamic properties.[11] Photodegradation[59] and bacterial degradation of Pyr has been studied.[12]

Application

Pyridine may be used in the synthesis of the following:
  • complexes with cobalt(II) halides
[13]
  • pyridine-d 5, a deuterated form of pyridine
  • [14]
  • ionic liquid matrices (ILMs)
  • [80]

    Packaging

    4×4 L in aluminum bottle

    Pictograms

    FlameExclamation mark

    Signal Word

    Danger

    Hazard Classifications

    Acute Tox. 4 Dermal - Acute Tox. 4 Inhalation - Acute Tox. 4 Oral - Eye Irrit. 2 - Flam. Liq. 2 - Skin Irrit. 2

    Storage Class Code

    3 - Flammable liquids

    WGK

    WGK 2

    Flash Point(F)

    68.0 °F - closed cup

    Flash Point(C)

    20 °C - closed cup

    Certificate of Analysis

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    Certificate of Origin

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