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494410

Sigma-Aldrich

Pyridine

biotech. grade, ≥99.9%

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Empirical Formula (Hill Notation):
C5H5N
CAS Number:
110-86-1
Molecular Weight:
79.10
Beilstein:
103233
EC Number:
203-809-9
MDL number:
MFCD00011732
PubChem Substance ID:
329757450
NACRES:
NA.21

grade

biotech. grade

Quality Level

200

vapor density

2.72 (vs air)

vapor pressure

10 mmHg ( 13.2 °C)
20 mmHg ( 25 °C)

Assay

≥99.9%

form

liquid

autoignition temp.

899 °F

expl. lim.

12.4 %

impurities

≤0.002% NH3
≤0.003% water

evapn. residue

<0.0003%

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:, passes test (limit about 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 have 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-d 5, a deuterated form of pyridine
  • ionic liquid matrices (ILMs)

Pictograms

FlameExclamation mark
GHS02,GHS07

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

Regulatory Information

危险化学品

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Absorption and luminescence of pyridine-based polymers.
Jessen SW, et al.
Synthetic Metals, 84(1), 501-506 (1997)
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)
Pyridine coenzymes of subcellular tissue fractions.
Jacobson KB and Kaplan NO.
The Journal of Biological Chemistry, 226(2), 603-613 (1957)
The thermal decomposition of metal complexes-III: The decomposition of some pyridine and substituted-pyridine complexes of cobalt (II) halides.
Allan JR, et al.
J. Inorg. Nucl. Chem., 26(11), 1895-1902 (1964)
Bacterial degradation of pyridine, indole, quinoline, and their derivatives under different redox conditions.
Fetzner, S.
Applied Microbiology and Biotechnology, 49(3), 237-250 (1998)
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