Dimethyl sulfoxide (data page)

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This page provides supplementary chemical data on dimethyl sulfoxide.

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,[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 mPa·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

Spectral data

References

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