Acetonitrile
Athanor · official
C2H3N · 41.05 g/mol
Also called MeCN, ACN, methyl cyanide, cyanomethane
Names and identifiers
- IUPAC name
- acetonitrile
- Synonyms
- MeCN, ACN, methyl cyanide
+ 37 more
cyanomethane, Methyl cyanide, Cyanomethane, Ethanenitrile, Ethyl nitrile, Methane, cyano-, Methanecarbonitrile, Acetonitril, Cyanure de methyl, Methylkyanid, USAF EK-488, RCRA waste number U003, NCI-C60822, DTXSID7020009, AI3-00327, Z072SB282N, NSC-7593, DTXCID909, CHEBI:38472, RefChem:6609, 200-835-2, Methylkyanid [Czech], Cyanure de methyl [French], Acetonitril [German, Dutch], Acetonitrile, anhydrous, CH3CN, Acetonitrile with 0.1% ammonium acetate, MFCD00001878, ACETONITRILE WITH 0.1per cent AMMONIUM ACETATE, anhydrous Acetonitrile, ACETONITRILE (2-13C, 99%), Acetonitrile [UN1648] [Flammable liquid], Methyl Cyanide, Cyanomethane, Ethanenitrile, ethyl, Acetonitril (GERMAN, DUTCH), Acetonitrile, for DNA synthesis, acetnitrile, Ethanonitrile
- Molecular formula
- C2H3N
- Empirical formula
- C2H3N
- Molecular weight
- 41.05 g/mol
- Exact mass
- 41.02655
- CAS number
- 75-05-8
- PubChem CID
- 6342
- Canonical SMILES
- CC#N
- Isomeric SMILES
- CC#N
- InChI
- InChI=1S/C2H3N/c1-2-3/h1H3
- InChIKey
- WEVYAHXRMPXWCK-UHFFFAOYSA-N
- Molfile
Names, InChI and the identifiers from PubChem, retrieved 2026-10-14.
Physical properties
- Appearance
- Colorless, limpid liquid[6]
6 values
From Hazardous Substances Data Bank (HSDB), the most authoritative source here.
Value As written Source – Acetonitrile appears as a colorless limpid liquid with an aromatic odor. Flash point 42 °F. Density 0.783 g / cm3. Toxic by skin absorption. Less dense than water. Vapors are denser than air. [1] CAMEO Chemicals – CBI; Liquid [2] EPA Chemical Data Reporting (CDR) – COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. [3] ILO-WHO International Chemical Safety Cards (ICSCs) – Colorless liquid with an aromatic odor. [4] Occupational Safety and Health Administration (OSHA) – Colorless liquid with an aromatic odor. [5] The National Institute for Occupational Safety and Health (NIOSH) –shown Colorless, limpid liquid [6] Hazardous Substances Data Bank (HSDB)cites Lewis, R.J. Sr.; Hawley's Condensed Chemical Dictionary 15th Edition. John Wiley & Sons, Inc. New York, NY 2007., p. 9 - Odor
- Aromatic odor[6]
2 values
From Hazardous Substances Data Bank (HSDB), the most authoritative source here.
Value As written Source –shown Aromatic odor [6] Hazardous Substances Data Bank (HSDB)cites NIOSH. NIOSH Pocket Guide to Chemical Hazards. Department of Health & Human Services, Centers for Disease Control & Prevention. National Institute for Occupational Safety & Health. DHHS (NIOSH) Publication No. 2010-168 (2010). Available from: https://www.cdc.gov/niosh/npg – Sweet, ethereal odor [6] Hazardous Substances Data Bank (HSDB)cites DeVito SC; Nitriles. Kirk-Othmer Encyclopedia of Chemical Technology. (1999-2014). New York, NY: John Wiley & Sons. Online Posting Date: Sept 14, 2007. - Melting point
- -45 °C (-49 °F, NTP 1992)[1]
5 values
5 of 5 sources agree on it (most common value).
Value As written Source −45 °Cshown -49 °F (NTP, 1992) [1] CAMEO Chemicalscites National Toxicology Program, Institute of Environmental Health Sciences, National Institutes of Health (NTP). 1992. National Toxicology Program Chemical Repository Database. Research Triangle Park, North Carolina. −46 °C -46 °C [3] ILO-WHO International Chemical Safety Cards (ICSCs) −45 °C -49 °F [4] Occupational Safety and Health Administration (OSHA) −43.8 °C -43.82 °C [7] PAC Chemical Database, U.S. Department of Energy −45 °C -49 °F [5] The National Institute for Occupational Safety and Health (NIOSH) - Boiling point
- 81.65 °C @760 [mmHg][7]
5 values
5 of 5 sources agree on it (most common value).
Value As written Source 81.6 °C 178.9 °F at 760 mmHg (NTP, 1992) [1] CAMEO Chemicalscites National Toxicology Program, Institute of Environmental Health Sciences, National Institutes of Health (NTP). 1992. National Toxicology Program Chemical Repository Database. Research Triangle Park, North Carolina. 82 °C 82 °C [3] ILO-WHO International Chemical Safety Cards (ICSCs) 82 °C 179 °F [4] Occupational Safety and Health Administration (OSHA) 81.7 °Cshown 81.65 °C @760 [mm Hg] [7] PAC Chemical Database, U.S. Department of Energy 82 °C 179 °F [5] The National Institute for Occupational Safety and Health (NIOSH) - Density
- 0.786 @ 20°C[7]
5 values
5 of 5 sources agree on it (most common value).
Value As written Source – 0.787 at 68 °F (USCG, 1999) - Less dense than water [1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office. – Relative density (water = 1): 0.8 [3] ILO-WHO International Chemical Safety Cards (ICSCs) – 0.787 [4] Occupational Safety and Health Administration (OSHA) –shown 0.786 @ 20°C [7] PAC Chemical Database, U.S. Department of Energy – 0.78 [5] The National Institute for Occupational Safety and Health (NIOSH) 6 more values were reported but failed the checks (unreadable or out of range), so they are not shown.
- Solubility in water
- Solubility in water, g/100ml at 20 °C: 1390 (very good)[3]
7 values
From ILO-WHO International Chemical Safety Cards (ICSCs), the most authoritative source here.
Value As written Source – greater than or equal to 100 mg/mL at 72.5 °F (NTP, 1992) [1] CAMEO Chemicalscites National Toxicology Program, Institute of Environmental Health Sciences, National Institutes of Health (NTP). 1992. National Toxicology Program Chemical Repository Database. Research Triangle Park, North Carolina. – In water, >800 g/L at 25 °C [6] Hazardous Substances Data Bank (HSDB)cites Yalkowsky, S.H., He, Yan, Jain, P. Handbook of Aqueous Solubility Data Second Edition. CRC Press, Boca Raton, FL 2010, p. 27 – In water, infinite solubility at 25 °C [6] Hazardous Substances Data Bank (HSDB)cites Riddick, J.A., W.B. Bunger, Sakano T.K. Techniques of Chemistry 4th ed., Volume II. Organic Solvents. New York, NY: John Wiley and Sons., 1985., p. 583 – Soluble in alcohol [6] Hazardous Substances Data Bank (HSDB)cites Lewis, R.J. Sr.; Hawley's Condensed Chemical Dictionary 15th Edition. John Wiley & Sons, Inc. New York, NY 2007., p. 9 – For more Solubility (Complete) data for ACETONITRILE (6 total), please visit the HSDB record page. [6] Hazardous Substances Data Bank (HSDB) –shown Solubility in water, g/100ml at 20 °C: 1390 (very good) [3] ILO-WHO International Chemical Safety Cards (ICSCs) – Miscible [5] The National Institute for Occupational Safety and Health (NIOSH) - log P
- -0.3[3]
2 values
Sources disagree; from ILO-WHO International Chemical Safety Cards (ICSCs), the most authoritative.
Value As written Source – log Kow = -0.34 [6] Hazardous Substances Data Bank (HSDB)cites Hansch, C., Leo, A., D. Hoekman. Exploring QSAR - Hydrophobic, Electronic, and Steric Constants. Washington, DC: American Chemical Society., 1995., p. 4 –shown -0.3 [3] ILO-WHO International Chemical Safety Cards (ICSCs) - pKa
- pKa = -4.30 (conjugate acid)[6]
- Vapor pressure
- Vapor pressure, kPa at 25 °C: 9.9[3]
4 values
3 of 4 sources agree on it (most common value).
Value As written Source 73 mmHg 73 mmHg at 68 °F (NTP, 1992) [1] CAMEO Chemicalscites National Toxicology Program, Institute of Environmental Health Sciences, National Institutes of Health (NTP). 1992. National Toxicology Program Chemical Repository Database. Research Triangle Park, North Carolina. 88.8 mmHg 88.8 mm Hg at 25 °C [6] Hazardous Substances Data Bank (HSDB)cites Boublik, T., Fried, V., and Hala, E., The Vapour Pressures of Pure Substances. Second Revised Edition. Amsterdam: Elsevier, 1984. 74 mmHgshown Vapor pressure, kPa at 25 °C: 9.9 [3] ILO-WHO International Chemical Safety Cards (ICSCs) 73 mmHg 73 [mm Hg] @20 °C [7] PAC Chemical Database, U.S. Department of Energy 2 more values were reported but failed the checks (unreadable or out of range), so they are not shown.
- Flash point
- 6 °C (42 °F) (Open Cup)[6]
4 values
3 of 4 sources agree on it (most common value).
Value As written Source 6 °C 42 °F (NTP, 1992) [1] CAMEO Chemicalscites National Toxicology Program, Institute of Environmental Health Sciences, National Institutes of Health (NTP). 1992. National Toxicology Program Chemical Repository Database. Research Triangle Park, North Carolina. 6 °Cshown 42 °F (6 °C) (Open Cup) [6] Hazardous Substances Data Bank (HSDB)cites National Fire Protection Association; Fire Protection Guide to Hazardous Materials. 14TH Edition, Quincy, MA 2010, p. 325-10 2 °C 2 °C c.c. [3] ILO-WHO International Chemical Safety Cards (ICSCs) 6 °C 42 °F (open cup) [4] Occupational Safety and Health Administration (OSHA) 1 more value was reported but failed the checks (unreadable or out of range), so it is not shown.
- Autoignition temperature
- 524 °C[3]
3 values
3 of 3 sources agree on it (most common value).
Value As written Source 524 °C 975 °F (USCG, 1999) [1] CAMEO Chemicalscites U.S. Coast Guard. 1999. Chemical Hazard Response Information System (CHRIS) - Hazardous Chemical Data. Commandant Instruction 16465.12C. Washington, D.C.: U.S. Government Printing Office. 524 °C 975 °F (524 °C) [6] Hazardous Substances Data Bank (HSDB)cites National Fire Protection Association; Fire Protection Guide to Hazardous Materials. 14TH Edition, Quincy, MA 2010, p. 325-10 524 °Cshown 524 °C [3] ILO-WHO International Chemical Safety Cards (ICSCs) - Viscosity
- 0.35 cP at 20 °C[3]
2 values
2 of 2 sources agree on it (most common value).
Value As written Source – 0.35 cP at 20 °C [6] Hazardous Substances Data Bank (HSDB)cites DeVito SC; Nitriles. Kirk-Othmer Encyclopedia of Chemical Technology. (1999-2014). New York, NY: John Wiley & Sons. Online Posting Date: Sept 14, 2007. –shown 0.35 cP at 20 °C [3] ILO-WHO International Chemical Safety Cards (ICSCs)
Each value as its source reports it, with the source's number after it (listed under References). Where several sources report a property, the row shows the value most of them agree on, the rule the app uses; open the values to see every one.
Calculated
- Heavy atoms
- 3
- Rings
- 0
- Aromatic rings
- 0
- Fraction sp³ carbons (Fsp3)
- 0.5
- H-bond donors
- 0
- H-bond acceptors
- 1
- Rotatable bonds
- 0
- TPSA (Ų)
- 23.8
- Formal charge
- 0
- XLogP3
- 0 PubChem
- Complexity
- 29 PubChem
- Stereocenters
- None
- Double-bond geometry
- None specified
- Point group
- C3v of one 3D conformer with its hydrogens, by Athanor’s engine (as in the app)
Elemental analysis
- C58.51%
- H7.37%
- N34.12%
Isotope pattern
Each peak is a nominal mass with its abundance-weighted exact mass, as a percentage of the tallest, from IUPAC natural isotope abundances.
Computed from the structure with RDKit 2026.09 when this page was built, beside PubChem's own computed values from its record; where the two differ, both are shown.
Predicted
- log P
- 0.53 Crippen (Wildman and Crippen 1999)
- log S (water solubility)
- -0.43 ESOL (Delaney 2004), log mol/L
- Synthetic accessibility
- 3.36 SA score, 1 easy to 10 hard (Ertl and Schuffenhauer 2009)
Drug-likeness: Lipinski’s rule of five
- Molecular weight ≤ 500: 41.05
- log P ≤ 5 (Crippen): 0.53
- H-bond donors ≤ 5: 0
- H-bond acceptors ≤ 10: 1
Passes all four rules.
¹³C NMR shifts, predicted
Predictions, not measurements; each names its method. A measured log P, where a source reports one, is under Physical properties.
Safety
Danger
Harmonized EU classification (CLP Annex VI). Source [8].
Flammable
Harmful or irritant
- H225Highly Flammable liquid and vapor
- H302Harmful if swallowed
- H312Harmful in contact with skin
- H319Causes serious eye irritation
- H332Harmful if inhaled
Precautionary statements: P210, P233, P240, P241, P242, P243, P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P317, P321, P330, P337+P317, P362+P364, P370+P378, P403+P235, P501
View all classifications (3)
- [8] Regulation (EC) No 1272/2008 of the European Parliament and of the Council · DangerH225, H302, H312, H319, H332
- [9] European Chemicals Agency (ECHA) · 1,194 reports · DangerH302, H312, H319, H332
- [6] Hazardous Substances Data Bank (HSDB) · DangerH225, H302, H312, H319, H332
Exposure limits
First aid
- Eyes: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. Immediately transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop. Skin: Immediately flood affected skin with water while removing and isolating all contaminated clothing.[1]
- General First Aid: · Call 911 or emergency medical service. · Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination. · Move victim to fresh air if it can be done safely. · Administer oxygen if breathing is difficult. · If victim is not breathing: -- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance. -- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped…[10]
- (General first aid procedures) Eye: Irrigate immediately - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately. Skin: Water flush immediately - If this chemical contacts the skin, immediately flush the contaminated skin with water. If this chemical penetrates the clothing, immediately remove the clothing and flush the skin with water.[5]
- Fresh air, rest. Artificial respiration may be needed. No mouth-to-mouth artificial respiration. Refer immediately for medical attention.[3]
Storage
- Fireproof. Keep in a well-ventilated room. Separated from acids, bases, strong oxidants and food and feedstuffs. Well closed.[3]
- Protect containers against physical damage. Outdoor or detached storage is preferable. Separate from any sources of ignition and combustible materials. Storage room should be well-ventilated.[6]
- Inside storage should be in a standard flammable liquids storage warehouse, room, or cabinet. Separate from oxidizing materials. Outside or detached storage is preferred.[6]
- Store in tightly closed containers in a cool, well ventialted area. Metal containers involving the transfer of this chemical should be grounded and bonded. Where possible, automatically pump liquid from drums or other storage containers to process containers. Drums must be equipped with self-closing valves, pressure vacuum bungs; and flame arresters. Use only non-sparking tools and equipment, especially when opening and closing containers of this chemical.[6]
Incompatibilities
- Strong oxidizers such as chlorine, bromine, and fluorine; chlorosulfonic acid; oleum or sulfuric acid. May accumulate static electricial charges, and may cause ignition of its vapors.[6]
- Strong oxidizers.[6]
- Will react with water, steam, acids to produce toxic & flammable vapors.[6]
- Nitrogen-fluorine compounds are potentially explosive in contact with acetonitrile. ... A solution of an unspecified lanthanide perchlorate in acetonitrile detonated while being heated under reflux.[6]
Safety data sheets on the supplier’s page: Thermo Fisher Scientific, Oakwood Products, VladaChem.
Always read the supplier’s safety data sheet before working with it.
Spectra
- NMRHazardous Substances Data Bank (HSDB) · NMRShiftDB
- 1H NMRHuman Metabolome Database (HMDB) (JEOL · 300 MHz · CDCl3) · SpectraBase (BRUKER AC-300)
- 13C NMRHuman Metabolome Database (HMDB) (Varian · 25.16 MHz · CDCl3) · SpectraBase
- 15N NMRSpectraBase
- GC-MSHuman Metabolome Database (HMDB) (EI-B · positive) · Human Metabolome Database (HMDB) (EI-B · positive) · Human Metabolome Database (HMDB) (EI-B · positive) · Human Metabolome Database (HMDB) (EI-B · positive) · Human Metabolome Database (HMDB) (EI-B · positive) · Human Metabolome Database (HMDB) (EI-B · positive)
- LC-MSMassBank of North America (MoNA) (Amazon Speed, Bruker · Electrospray Ionization (ESI) · positive)
- Other MSHazardous Substances Data Bank (HSDB) · MassBank Europe (HITACHI RMU-6M · EI-B · POSITIVE) · MassBank Europe (HITACHI RMU-6L · EI-B · POSITIVE) · MassBank Europe (HITACHI RMU-7M · EI-B · POSITIVE) · MassBank Europe (HITACHI RMU-6M · EI-B · POSITIVE) · MassBank Europe (Agilent 7250 GC/QTOF · GC-EI-QTOF · POSITIVE)
- UVHazardous Substances Data Bank (HSDB)
- IRHazardous Substances Data Bank (HSDB)
- FTIRSpectraBase (DIGILAB FTS-40 · NEAT)
- ATR-IRSpectraBase (Bruker Tensor 27 FT-IR · ATR-Neat (DuraSamplIR II))
- Vapor Phase IRSpectraBase (Bruker IFS 85 · Gas-GC)
- RamanSpectraBase (Thermo Nicolet FT-Raman 960 · FT-Raman)
Experimental spectra held by these sources; each link opens the source's own record.
Literature
Reading PubChem, OpenAlex and GSRS…
Bioactivity
Reading ChEMBL…
References
- [1]CAMEO Chemicals · Public domain (NOAA) · via PubChem · retrieved 2026-10-14
- [2]EPA Chemical Data Reporting (CDR) · Public domain (US EPA) · via PubChem · retrieved 2026-10-14
- [3]ILO-WHO International Chemical Safety Cards (ICSCs) · CC BY 4.0 · via PubChem · retrieved 2026-10-14
- [4]Occupational Safety and Health Administration (OSHA) · Public domain (US DOL) · via PubChem · retrieved 2026-10-14
- [5]The National Institute for Occupational Safety and Health (NIOSH) · Public domain (US CDC) · via PubChem · retrieved 2026-10-14
- [6]Hazardous Substances Data Bank (HSDB) · Public domain (US NLM) · via PubChem · retrieved 2026-10-14
- [7]PAC Chemical Database, U.S. Department of Energy · Public domain (US DOE) · via PubChem · retrieved 2026-10-14
- [8]Regulation (EC) No 1272/2008 of the European Parliament and of the Council · EU reuse policy, CC BY 4.0 · via PubChem · retrieved 2026-10-14
- [9]European Chemicals Agency (ECHA) · ECHA legal notice: reuse with acknowledgement · via PubChem · retrieved 2026-10-14
- [10]Emergency Response Guidebook (ERG) · Public domain (US DOT) · via PubChem · retrieved 2026-10-14
- [11]NMRShiftDB · Linked only · via PubChem · retrieved 2026-10-14
- [12]Human Metabolome Database (HMDB) · Linked only · via PubChem · retrieved 2026-10-14
- [13]SpectraBase · Linked only · via PubChem · retrieved 2026-10-14
- [14]MassBank of North America (MoNA) · CC BY 4.0 · via PubChem · retrieved 2026-10-14
- [15]NIST Mass Spectrometry Data Center · Linked only · via PubChem · retrieved 2026-10-14
- [16]MassBank Europe · Linked only · via PubChem · retrieved 2026-10-14
- ·Calculated values: computed by Athanor with RDKit 2026.09 from the structure.
- ·Literature on PubChem
Data last updated 2026-10-14.
