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Synonyms
6129-EP2305652A2; 4606-EP2289888A2; MCULE-2005841258; 1926-EP2305629A1; CCG-213615; dimethyl-sulfoxide; 1926-EP2308872A1; 1926-EP2292234A1; 4606-EP2298768A1; Dimethyl sulfur oxide;
IUPAC Name
methylsulfinylmethane;
Molecular Weight
78.129g/mol
Molecular Formula
C2H6OS;C2H6OS;C2H6OS;
Canonical SMILES
CS(=O)C;
InChI
InChI=1S/C2H6OS/c1-4(2)3/h1-2H3;
InChI Key
IAZDPXIOMUYVGZ-UHFFFAOYSA-N;
Melting Point
65.3 ° F (NTP, 1992);18.5°C;18.45 deg C;18.5°C;18.5 °C;
Density
1.101 at 68 ° F (USCG, 1999);1.100 at 20 deg C/4 deg C;Relative density (water = 1): 1.1;
Solubility
greater than or equal to 100 mg/mL at 68° F (NTP, 1992);12.80 M;Soluble in water;Miscible with water;Soluble in ethanol, acetone, ether, carbon tetrachloride, ethyl acetate;Soluble in chloroform and benzene;1000 mg/mL;Solubility in water: miscible;
Storage
Dimethyl sulfoxide is reasonably stable to heat,but upon prolonged reflux it decomposes slightly to methyl mercaptan and bismethylthiomethane. This decomposition is aided by acids, and is retarded by many bases. When heated to decomposition, toxic fumes are emitted.
At temperatures between 40 and 60°C, it has been reported that dimethyl sulfoxide suffers a partial breakdown, which is indicated by changes in physical properties such as refractive index, density, and viscosity.
Dimethyl sulfoxide should be stored in airtight, light-resistant containers. The PhEur 6.0 states that glass containers should be used. Contact with plastics should be avoided.Store at RT.
At temperatures between 40 and 60°C, it has been reported that dimethyl sulfoxide suffers a partial breakdown, which is indicated by changes in physical properties such as refractive index, density, and viscosity.
Dimethyl sulfoxide should be stored in airtight, light-resistant containers. The PhEur 6.0 states that glass containers should be used. Contact with plastics should be avoided.Store at RT.
Color Form
Colorless liquid;Very hygroscopic liquid;
Complexity
29
Covalently-Bonded Unit Count
1
Decomposition
When heated to decomposition it emits toxic fumes of /sulfur oxides/.;
EC Number
200-664-3
Exact Mass
78.014g/mol
H-Bond Acceptor
2
Heavy Atom Count
4
ICSC Number
0459
Monoisotopic Mass
78.014g/mol
NSC Number
760436
Odor
Slightly sulfurous odor;Distinctive garlic or oyster-like odor;
Other Experimental
pK(BH+) (aqueous sulfuric acid): -2.7;Very hygroscopic; dielectric constant: 45. Specific heat 0.4698 calorie/g at 25 deg C;Heat of solution: -97 Btu/lb = -54 Cal/g;Heat of fusion: 13.5 KJ/mol; dipole moment = 1.4X10-29 = 4.2 debye;VP: 0.42 mm at 20 deg C;Henry's Law constant = 1.031X10-8 atm-cu m/mol at 25 deg C;Hydroxyl radical reaction rate constant = 9.0X10-11 cu cm/molecule-sec at 25 deg C;
RTECS Number
PV6210000
Topological Polar Surface Area
36.3A^2
UNII
YOW8V9698H
UN Number
2811
Vapor Pressure
0.42 mm Hg at 68 ° F (NTP, 1992);0.61 mmHg;0.60 mm Hg at 25 deg C;Vapor pressure, Pa at 20 °C: 59.4;
