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Name Azabenzene
CAS 110-86-1
EINECS(EC#) 203-809-9
Molecular Formula C3H6O
MDL Number MFCD00002920
Molecular Weight 58.08
MOL File 110-86-1.mol

Chemical Properties

Appearance Pyridine is a colorless liquid. Nauseating, sickening fish-like odor. The Odor Threshold is 0.17 ppm.
Melting point  -42 °C
Boiling point  96-98 °C(lit.)
density  0.983 g/mL at 20 °C
vapor density  2.72 (vs air)
vapor pressure  23.8 mm Hg ( 25 °C)
FEMA  2966
refractive index  n20/D 1.509(lit.)
Fp  68 °F
storage temp.  Store at RT.
solubility  H2O: in accordance
form  Liquid
pka 5.25(at 25℃)
color  colorless
Odor Nauseating odor detectable at 0.23 to 1.9 ppm (mean = 0.66 ppm)
PH 8.81 (H2O, 20℃)
Relative polarity 0.302
Stability: Stable. Flammable. Incompatible with strong oxidizing agents, strong acids.
explosive limit 12.4%
Odor Threshold 0.063ppm
Water Solubility  Miscible
FreezingPoint  -42℃
λmax λ: 305 nm Amax: 1.00
λ: 315 nm Amax: 0.15
λ: 335 nm Amax: 0.02
λ: 350-400 nm Amax: 0.01
Merck  14,7970
BRN  103233
Henry's Law Constant 18.4 at 30 °C (headspace-GC, Chaintreau et al., 1995)
Exposure limits TLV-TWA 5 ppm (~15 mg/m3) (ACGIH, MSHA,and OSHA); STEL 10 ppm (ACGIH), IDLH 3600 ppm (NIOSH).
Contact allergens
Pyridine (unsubstituted pyridine) and its derivative (substituted pyridines) are widely used in chemistry. Pyridine is a solvent used for many organic compounds and anhydrous metallic salt chemicals. Contained in Karl Fischer reagent, it induced contact dermatitis in a laboratory technician. No cross-sensitivity is observed between those different substances.
CAS DataBase Reference 110-86-1(CAS DataBase Reference)
IARC 2B (Vol. 77, 119) 2019
NIST Chemistry Reference Pyridine(110-86-1)
EPA Substance Registry System 110-86-1(EPA Substance)

Safety Data

Hazard Codes  T,N,F,Xn
Risk Statements 
R11:Highly Flammable.
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed .
R39/23/24/25:Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed .
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed .
Safety Statements 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S38:In case of insufficient ventilation, wear suitable respiratory equipment .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S61:Avoid release to the environment. Refer to special instructions safety data sheet .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S28:After contact with skin, wash immediately with plenty of ... (to be specified by the manufacturer) .
S24/25:Avoid contact with skin and eyes .
S22:Do not breathe dust .
S36/37:Wear suitable protective clothing and gloves .
S16:Keep away from sources of ignition-No smoking .
S7:Keep container tightly closed .
RIDADR  UN 1282 3/PG 2
WGK Germany  2
RTECS  UR8400000
Autoignition Temperature 482 °C
Hazard Note  Highly Flammable/Harmful
HazardClass  3
PackingGroup  II
HS Code  29333100
Safety Profile
Poison by intraperitoneal route. Moderately toxic by ingestion, skin contact, intravenous, and subcutaneous routes. Mildly toxic by inhalation. A skin and severe eye irritant. Mutation data reported. Can cause central nervous system depression, gastrointestinal upset, and liver and kidney damage. A flammable liquid and dangerous fire hazard when exposed to heat, flame, or oxidizers. Severe explosion hazard in the form of vapor when exposed to flame or spark. Reacts violently with chlorosulfonic acid, chromium trioxide, dinitrogen tetraoxide, HNO3, oleum, perchromates, ppropiolactone, AgClO4, H2SO4. Incandescent reaction with fluorine. Reacts to form pyrophoric or explosive products with bromine trifluoride, trifluoromethyl hypofluorite. Mixtures with formamide + iodine + sulfur trioxide are storage hazards, releasing carbon dioxide and sulfuric acid. Incompatible with oxidizing materials. Reacts with maleic anhydride (above 150°C) evolving carbon dioxide. To fight fire, use alcohol foam. When heated to decomposition it emits highly toxic fumes of NOx.
Hazardous Substances Data 110-86-1(Hazardous Substances Data)
LD50 orally in rats: 1.58 g/kg (Smyth)
IDLA 1,000 ppm

Hazard Information

Material Safety Data Sheet(MSDS)

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