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Dimethyl sulfoxide (data page)

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Chemical 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.

Structure and properties

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

Thermodynamic properties

Phase behavior
Triple point 291.67 K (18.52 °C), ? Pa
Critical point 720 K (447 °C), 5630 kPa
Std enthalpy change
of fusion, ΔfusH 		14.37 kJ/mol
Std entropy change
of fusion, ΔfusS 		49.26 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapH 		52.9 kJ/mol
Std entropy change
of vaporization, ΔvapS 		? J/(mol·K)
Solid properties
Std enthalpy change
of formation, ΔfHsolid 		? kJ/mol
Standard molar entropy,
Ssolid 		? J/(mol K)
Heat capacity, cp 149.40 J/(mol·K)
Liquid properties
Std enthalpy change
of formation, ΔfHliquid 		−203.4 kJ/mol
Standard molar entropy,
Sliquid 		188.78 J/(mol·K)
Enthalpy of combustion, ΔcH −2037.3 kJ/mol
Heat capacity, cp 153 J/(mol·K) at 25 °C
Gas properties
Std enthalpy change
of formation, ΔfHgas 		−150.5 kJ/mol
Standard molar entropy,
Sgas 		? J/(mol·K)
Heat capacity, cp ? J/(mol·K)

Vapor pressure of liquid

vapor pressure at 20 °C = 0.556 mbar = 0.417 mmHg

log10 of dimethyl sulfoxide vapor pressure. Uses formula log e ⁡ P mmHg = {\displaystyle \log _{e}P_{\text{mmHg}}={}} log e ⁡ 760 101.325 − 4.215616 log e ⁡ ( T + 273.15 ) − 7522.806 T + 273.15 + 46.78064 − 2.450859 × 10 − 7 ( T + 273.15 ) 2 {\displaystyle \log _{e}{\frac {760}{101.325}}-4.215616\log _{e}(T+273.15)-{\frac {7522.806}{T+273.15}}+46.78064-2.450859\times 10^{-7}(T+273.15)^{2}} obtained from CHERIC

Distillation data

Vapor-liquid equilibrium
for dimethyl sulfoxide/water
P = 550 mm Hg
BP
Temp.
°C 		% by mole water
liquid vapor
168.4 6.5 34.6
160.9 10.8 51.8
153.1 16.4 62.7
146.4 21.2 71.0
140.6 26.7 78.4
135.1 32.1 83.9
130.8 37.4 87.6
124.3 44.8 91.7
121.0 48.5 93.5
114.9 55.4 96.0
107.8 66.4 98.0
102.1 74.4 98.9
97.2 84.0 99.6
96.3 85.7 99.6
93.9 91.9 99.8
   
Vapor-liquid equilibrium
for dimethyl sulfoxide/ethanol
P = 14.665 kPa
BP
Temp.
°C 		% by mole DMSO
liquid vapor
55.80 48.75 1.0
64.50 59.75 1.6
66.75 64.00 2.5
70.80 71.00 3.6
76.50 76.25 5.0
81.50 80.50 6.0
91.50 85.00 13.0
100.74 90.00 21.0

Spectral data

UV-Vis
λmax <220 nm
Extinction coefficient, ε 0.0034 % cm in unpHed water at 260 nm
IR
Spectrum NIST
Major absorption bands 3000, 2900, 1200–1240, 1000–1080, 960, 690 cm
NMR
Proton NMR 2.54((CD3)2SO), 2.71 in D2O;
Carbon-13 NMR 40ppm;
Other NMR data  
MS
Masses of
main fragments 		 

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 (21): 7512–7515. doi:10.1021/jo971176v. PMID 11671879.
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