Dimethyl sulfoxide (data page)

This page provides supplementary chemical data on dimethyl sulfoxide.

Material Safety Data Sheet

The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions. MSDS is available at Mallinckrodt Baker.

Structure and properties
Structure and properties
Index of refraction,[1] nD 1.4795 at 20 °C
1.4787 at 21 °C
Abbe number ?
Dielectric constant,[2] εr 48 ε0 at 20 °C
Bond strength ?
Bond length ?
Bond angle ?
Magnetic susceptibility ?
Surface tension[2] 43 dyn/cm at 20 °C
Viscosity 2.14 mPa·s[2] at 20 °C
1.1 mP·s[1] at 27 °C

Thermodynamic properties
Phase behavior
Triple point 291.67 K (18.52 °C), ? Pa
Critical point[2] 720 K (447 °C), 5630 kPa
Std enthalpy change
of fusion, ΔfusHo		 14.37 kJ/mol
Std entropy change
of fusion, ΔfusSo		 49.26 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapHo		 52.9 kJ/mol
Std entropy change
of vaporization, ΔvapSo		 ? J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHosolid		 ? kJ/mol
Standard molar entropy,
Sosolid		 ? J/(mol K)
Heat capacity, cp 149.40 J/(mol·K)
Liquid properties
Std enthalpy change
of formation, ΔfHoliquid		 −203.4 kJ/mol
Standard molar entropy,
Soliquid		 188.78 J/(mol·K)
Enthalpy of combustion, ΔcHo −2037.3 kJ/mol
Heat capacity, cp 153 J/(mol·K) at 25 °C
Gas properties
Std enthalpy change
of formation, ΔfHogas		 −150.5 kJ/mol
Standard molar entropy,
Sogas		 ? J/(mol·K)
Heat capacity, cp ? J/(mol·K)

Vapor pressure of liquid

vapor pressure at 20 °C = 0.556 mbar = 0.417 mmHg[2]

log10 of Dimethyl sulfoxide vapor pressure. Uses formula: obtained from CHERIC[3]

Distillation data
Vapor-liquid equilibrium
for dimethyl sulfoxide/water[4]
P = 550 mm Hg
BP
Temp.
°C		 % by mole water
liquidvapor
168.46.534.6
160.910.851.8
153.116.462.7
146.421.271.0
140.626.778.4
135.132.183.9
130.837.487.6
124.344.891.7
121.048.593.5
114.955.496.0
107.866.498.0
102.174.498.9
97.284.099.6
96.385.799.6
93.991.999.8
    
Vapor-liquid equilibrium
for dimethyl sulfoxide/ethanol[4]
P = 14.665 kPa
BP
Temp.
°C		 % by mole DMSO
liquidvapor
55.8048.751.0
64.5059.751.6
66.7564.002.5
70.8071.003.6
76.5076.255.0
81.5080.506.0
91.5085.0013.0
100.7490.0021.0

Spectral data
UV-Vis
λmax <220 nm
Extinction coefficient, ε 0.0034 %−1 cm−1 in unpHed water at 260 nm
IR
SpectrumNIST
Major absorption bands 3000, 2900, 1200–1240, 1000–1080, 960, 690 cm−1
NMR
Proton NMR 2.54((CD3)2SO), 2.71 in D2O;[5]
Carbon-13 NMR 40ppm;
Other NMR data  
MS
Masses of
main fragments		  
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References
  1. Merck Index of Chemicals and Drugs, 9th ed. monograph 3249
  2. "Dimethyl Sulfoxide (DMSO) -- Technical". Atofina Chemicals, inc. Retrieved 26 May 2007.
  3. "Pure Component Properties" (Queriable database). Chemical Engineering Research Information Center. Retrieved 26 May 2007.
  4. "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. Retrieved 26 May 2007.
  5. Gottlieb, Hugo E. (October 1997). "NMR Chemical Shifts of Common Laboratory Solvents as Trace Impurities". The Journal of Organic Chemistry. 62: 7512–7515. doi:10.1021/jo971176v. PMID 11671879.

Except where noted otherwise, data relate to standard ambient temperature and pressure.

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