Compound: carbon monoxide
SMILES: [O+]#[C-]
InChIKey: UGFAIRIUMAVXCW-UHFFFAOYSA-N
Synonyms: carbon monoxide, carbon monooxide, Carbonic oxide, Carbon oxide (CO), 630-08-0, carbon(II) oxide, Exhaust gas, Flue gas, monoxide, Kohlenmonoxid, Koolmonoxyde, Kohlenoxyd, Wegla tlenek, Oxyde de carbone, Carbone (oxyde de), Carboneum oxygenisatum, Carbonio (ossido di), DTXSID5027273, 7U1EE4V452, CHEBI:17245, Monoxide, Carbon, RefChem:6405, DTXCID407273, carbon monooxide;carbon monoxide;carbon(II) oxide, 211-128-3, 35907-63-2, CARBON MONOXIDE (13C; 18O), Carbon monoxide [USAN], [CO], Carbon monoxide (USAN), Kohlenoxyd [German], Koolmonoxyde [Dutch], Kohlenmonoxid [German], Wegla tlenek [Polish], Oxyde de carbone [French], C#O, Carbone (oxyde de) [French], HSDB 903, Carbonio (ossido di) [Italian], EINECS 211-128-3, NA9202, UN1016, UNII-7U1EE4V452, .carbon monoxide, Carbon monoxide 10% by volume or more, Carbon monoxide, compressed, EC 211-128-3, SCHEMBL1110, CARBON MONOXIDE [MI], CARBON MONOXIDE [HSDB], CARBON MONOXIDE [VANDF], CARBON MONOXIDE [MART.], CHEMBL1231840, CARBON MONOXIDE [WHO-DD], Carbon monoxide - reference spectrum, c0369, CARBONEUM OXYGENISATUM [HPUS], CARBON MONOXIDE [EP MONOGRAPH], DB11588, NS00075458, Q2025, C00237, D09706, Carbon monoxide, compressed [UN1016]  [Poison gas], Carbon monoxide, refrigerated liquid (cryogenic liquid), Carbon monoxide, refrigerated liquid (cryogenic liquid) [NA9202]  [Poison gas], 147965-81-9
Theoretical properties:
molecular_formula: CO
molecular_weight: 28.010 g/mol
exact_mass: 27.994914619 g/mol
formal_charge: 0
hydrogen_bond_donor_count: 0
hydrogen_bond_acceptor_count: 1
rotatable_bond_count: 0
heavy_atom_count: 2
topological_polar_surface_area: 1 Å²
isotope_atom_count: 0
covalently_bonded_unit_count: 1
Physical properties:
physical_state: Colorless gas [Note: Shipped as a nonliquefied or liquefied compressed gas].
color: Colorless gas [Note: Shipped as a nonliquefied or liquefied compressed gas].
odor: Odorless
boiling_point: -312.7 °F at 760 mmHg (USCG, 1999)
melting_point: -326 °F (USCG, 1999)
density: 0.791 at -312.7 °F (USCG, 1999) - Less dense than water; will float
solubility: 2 % (NIOSH, 2024)
flash_point: Flammable gas
vapor_pressure: greater than 35 atm (NIOSH, 2024)
Descriptions:
pubchem: Carbon Monoxide can cause developmental toxicity according to an independent committee of scientific and health experts.
chebi: A one-carbon compound in which the carbon is joined only to a single oxygen. It is a colourless, odourless, tasteless, toxic gas.
chembl: CARBON MONOXIDE is a small molecule listed in the ChEMBL database and has reached clinical trial phase 3.0.
wikipedia: Carbon monoxide (chemical formula CO) is a poisonous, flammable gas that is colorless, odorless, tasteless, and slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the simplest carbon oxide. In coordination complexes, the carbon monoxide ligand is called carbonyl.  It is a key ingredient in many processes in industrial chemistry.
The most common source of carbon monoxide is the partial combustion of carbon-containing compounds. Numerous environmental and biological sources generate carbon monoxide. In industry, carbon monoxide is important in the production of many compounds, including drugs, fragrances, and fuels. 
Indoors CO is one of the most acutely toxic contaminants affecting indoor air quality. CO may be emitted from tobacco smoke and generated from malfunctioning fuel-burning stoves (wood, kerosene, natural gas, propane) and fuel-burning heating systems (wood, oil, natural gas) and from blocked flues connected to these appliances. Carbon monoxide poisoning is the most common type of fatal air poisoning in many countries.
Carbon monoxide has important biological roles across phylogenetic kingdoms. It is produced by many organisms, including humans. In mammalian physiology, carbon monoxide is a classical example of hormesis where low concentrations serve as an endogenous neurotransmitter (gasotransmitter) and high concentrations are toxic, resulting in carbon monoxide poisoning. It is isoelectronic with both cyanide anion CN− and molecular nitrogen N2.