Dimethyl Sulfoxide

• Formula: C₂H₆OS
• Molecular weight: 78.133
• IUPAC Standard InChI: InChI=1S/C2H6OS/c1-4(2)3/h1-2H3 Copy

  
• IUPAC Standard InChIKey: IAZDPXIOMUYVGZ-UHFFFAOYSA-N Copy
• CAS Registry Number: 67-68-5
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Isotopologues:
  • Dimethylsulfoxide-D6
• Other names: DMSO; Methane, sulfinylbis-; Methyl sulfoxide; Demsodrox; Dimexide; Dipirartril-tropico; Dolicur; Dromisol; Durasorb; DMS 70; DMS 90; Hyadur; Infiltrina; Somipront; Sulfinylbismethane; SQ 9453; Dimethyl sulphoxide; (CH3)2SO; A 10846; Deltan; Demasorb; Demavet; Demeso; Dermasorb; Doligur; Domoso; Gamasol 90; M 176; Methylsulfinylmethane; Rimso 50; Syntexan; NSC-763; Topsym; Dimethyl sulfur oxide; Herpid; Kemsol; Sclerosol; Sulfoxide, dimethyl; Methane, 1,1'-sulfinylbis-; DMSO (methyl sulfoxide); Sulphinylbis methane
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Gas Chromatography
  • References
  • Notes
• Other data available:
  • Condensed phase thermochemistry data
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
  • X-ray Photoelectron Spectroscopy Database, version 5.0
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Gas phase thermochemistry data

Go To: Top, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing

Enthalpy of vaporization

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Enthalpy of fusion

Entropy of fusion

Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
RCD - Robert C. Dunbar
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

C₂H₅OS^- +  =

By formula: C₂H₅OS^- + H⁺ = C₂H₆OS

 +  = ( • )

By formula: NO₂^- + C₂H₆OS = (NO₂^- • C₂H₆OS)

Free energy of reaction

C₆H₅NO₂^- +  = (C₆H₅NO₂^- • )

By formula: C₆H₅NO₂^- + C₂H₆OS = (C₆H₅NO₂^- • C₂H₆OS)

C₇H₇NO₃^- +  = (C₇H₇NO₃^- • )

By formula: C₇H₇NO₃^- + C₂H₆OS = (C₇H₇NO₃^- • C₂H₆OS)

 +  = ( • )

By formula: Br^- + C₂H₆OS = (Br^- • C₂H₆OS)

 +  = ( • )

By formula: I^- + C₂H₆OS = (I^- • C₂H₆OS)

C₇H₄F₃NO₂^- +  = (C₇H₄F₃NO₂^- • )

By formula: C₇H₄F₃NO₂^- + C₂H₆OS = (C₇H₄F₃NO₂^- • C₂H₆OS)

 +  = ( • )

By formula: Cl^- + C₂H₆OS = (Cl^- • C₂H₆OS)

C₂H₇OS⁺ +  = (C₂H₇OS⁺ • )

By formula: C₂H₇OS⁺ + C₂H₆OS = (C₂H₇OS⁺ • C₂H₆OS)

(C₂H₇OS⁺ • ) +  = (C₂H₇OS⁺ • 2)

By formula: (C₂H₇OS⁺ • C₂H₆OS) + C₂H₆OS = (C₂H₇OS⁺ • 2C₂H₆OS)

( • 4) +  = ( • 5)

By formula: (K⁺ • 4C₂H₆OS) + C₂H₆OS = (K⁺ • 5C₂H₆OS)

( • 5) +  = ( • 6)

By formula: (K⁺ • 5C₂H₆OS) + C₂H₆OS = (K⁺ • 6C₂H₆OS)

C₆H₄FNO₂^- +  = (C₆H₄FNO₂^- • )

By formula: C₆H₄FNO₂^- + C₂H₆OS = (C₆H₄FNO₂^- • C₂H₆OS)

Free energy of reaction

C₆H₄FNO₂^- +  = (C₆H₄FNO₂^- • )

By formula: C₆H₄FNO₂^- + C₂H₆OS = (C₆H₄FNO₂^- • C₂H₆OS)

Free energy of reaction

C₆H₄ClNO₂^- +  = (C₆H₄ClNO₂^- • )

By formula: C₆H₄ClNO₂^- + C₂H₆OS = (C₆H₄ClNO₂^- • C₂H₆OS)

Free energy of reaction

C₆H₄FNO₂^- +  = (C₆H₄FNO₂^- • )

By formula: C₆H₄FNO₂^- + C₂H₆OS = (C₆H₄FNO₂^- • C₂H₆OS)

Free energy of reaction

C₆H₄ClNO₂^- +  = (C₆H₄ClNO₂^- • )

By formula: C₆H₄ClNO₂^- + C₂H₆OS = (C₆H₄ClNO₂^- • C₂H₆OS)

Free energy of reaction

C₆H₄ClNO₂^- +  = (C₆H₄ClNO₂^- • )

By formula: C₆H₄ClNO₂^- + C₂H₆OS = (C₆H₄ClNO₂^- • C₂H₆OS)

Free energy of reaction

C₆H₄N₂O₄^- +  = (C₆H₄N₂O₄^- • )

By formula: C₆H₄N₂O₄^- + C₂H₆OS = (C₆H₄N₂O₄^- • C₂H₆OS)

Free energy of reaction

C₆H₄N₂O₄^- +  = (C₆H₄N₂O₄^- • )

By formula: C₆H₄N₂O₄^- + C₂H₆OS = (C₆H₄N₂O₄^- • C₂H₆OS)

Free energy of reaction

C₆H₄N₂O₄^- +  = (C₆H₄N₂O₄^- • )

By formula: C₆H₄N₂O₄^- + C₂H₆OS = (C₆H₄N₂O₄^- • C₂H₆OS)

Free energy of reaction

C₇H₇NO₂^- +  = (C₇H₇NO₂^- • )

By formula: C₇H₇NO₂^- + C₂H₆OS = (C₇H₇NO₂^- • C₂H₆OS)

Free energy of reaction

C₆F₄O₂^- +  = (C₆F₄O₂^- • )

By formula: C₆F₄O₂^- + C₂H₆OS = (C₆F₄O₂^- • C₂H₆OS)

Free energy of reaction

 +  = ( • )

By formula: C₆H₄O₂^- + C₂H₆OS = (C₆H₄O₂^- • C₂H₆OS)

Free energy of reaction

C₇H₄N₂O₂^- +  = (C₇H₄N₂O₂^- • )

By formula: C₇H₄N₂O₂^- + C₂H₆OS = (C₇H₄N₂O₂^- • C₂H₆OS)

Free energy of reaction

 +  = ( • )

By formula: K⁺ + C₂H₆OS = (K⁺ • C₂H₆OS)

C₄H₂O₃^- +  = (C₄H₂O₃^- • )

By formula: C₄H₂O₃^- + C₂H₆OS = (C₄H₂O₃^- • C₂H₆OS)

Free energy of reaction

C₇H₄N₂O₂^- +  = (C₇H₄N₂O₂^- • )

By formula: C₇H₄N₂O₂^- + C₂H₆OS = (C₇H₄N₂O₂^- • C₂H₆OS)

Free energy of reaction

2 +  = 2

By formula: 2C₂H₆S + O₂ = 2C₂H₆OS

=  + 0.5

By formula: C₂H₆O₂S = C₂H₆OS + 0.5O₂

( • 2) +  = ( • 3)

By formula: (Cl^- • 2C₂H₆OS) + C₂H₆OS = (Cl^- • 3C₂H₆OS)

( • 3) +  = ( • 4)

By formula: (Cl^- • 3C₂H₆OS) + C₂H₆OS = (Cl^- • 4C₂H₆OS)

( • 4) +  = ( • 5)

By formula: (Cl^- • 4C₂H₆OS) + C₂H₆OS = (Cl^- • 5C₂H₆OS)

( • 2) +  = ( • 3)

By formula: (I^- • 2C₂H₆OS) + C₂H₆OS = (I^- • 3C₂H₆OS)

( • 2) +  = ( • 3)

By formula: (Br^- • 2C₂H₆OS) + C₂H₆OS = (Br^- • 3C₂H₆OS)

( • ) +  = ( • 2)

By formula: (Cl^- • C₂H₆OS) + C₂H₆OS = (Cl^- • 2C₂H₆OS)

( • ) +  = ( • 2)

By formula: (I^- • C₂H₆OS) + C₂H₆OS = (I^- • 2C₂H₆OS)

( • ) +  = ( • 2)

By formula: (Br^- • C₂H₆OS) + C₂H₆OS = (Br^- • 2C₂H₆OS)

 +  = ( • )

By formula: Na⁺ + C₂H₆OS = (Na⁺ • C₂H₆OS)

Free energy of reaction

( • 2) +  = ( • 3)

By formula: (K⁺ • 2C₂H₆OS) + C₂H₆OS = (K⁺ • 3C₂H₆OS)

( • 3) +  = ( • 4)

By formula: (K⁺ • 3C₂H₆OS) + C₂H₆OS = (K⁺ • 4C₂H₆OS)

( • ) +  = ( • 2)

By formula: (K⁺ • C₂H₆OS) + C₂H₆OS = (K⁺ • 2C₂H₆OS)

C₇H₄N₂O₂^- +  = (C₇H₄N₂O₂^- • )

By formula: C₇H₄N₂O₂^- + C₂H₆OS = (C₇H₄N₂O₂^- • C₂H₆OS)

C₆H₄NO₃^- +  = (C₆H₄NO₃^- • )

By formula: C₆H₄NO₃^- + C₂H₆OS = (C₆H₄NO₃^- • C₂H₆OS)

C₆H₄NO₃^- +  = (C₆H₄NO₃^- • )

By formula: C₆H₄NO₃^- + C₂H₆OS = (C₆H₄NO₃^- • C₂H₆OS)

 +  = C₁₂H₁₂O₃S^-

By formula: C₁₀H₆O₂^- + C₂H₆OS = C₁₂H₁₂O₃S^-

F₆S^- +  = (F₆S^- • )

By formula: F₆S^- + C₂H₆OS = (F₆S^- • C₂H₆OS)

Free energy of reaction

 +  = ( • )

By formula: C₇F₁₄^- + C₂H₆OS = (C₇F₁₄^- • C₂H₆OS)

Free energy of reaction

 +  = ( • )

By formula: C₁₀H₆O₂^- + C₂H₆OS = (C₁₀H₆O₂^- • C₂H₆OS)

Free energy of reaction

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

• LIQUID (NEAT); BECKMAN IR-7 (GRATING); DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 4 cm^-1 resolution
• LIQUID (NEAT); PERKIN-ELMER 180; DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 4 cm^-1 resolution
• SOLUTION (10% IN CCl4 FOR 4000-1330 CM^-1, 10% IN CS2 FOR 1330-600 CM^-1); BECKMAN IR-7 (GRATING); DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 4 cm^-1 resolution
• SOLUTION (10.75% IN CCl4 FOR 3800-1300, 2.24% IN CS2 FOR 1300-620, AND 10.75% IN CCl4 FOR 620-250 CM^-1) VERSUS SOLVENT; Not specified, most likely a grating or hybrid spectrometer.; DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 4 cm^-1 resolution

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

• gas

Mass spectrum (electron ionization)

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

Gas Chromatography

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Kovats' RI, non-polar column, isothermal

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Kovats' RI, polar column, isothermal

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Van Den Dool and Kratz RI, non-polar column, temperature ramp

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Van Den Dool and Kratz RI, polar column, temperature ramp

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Normal alkane RI, non-polar column, temperature ramp

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Normal alkane RI, non-polar column, custom temperature program

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Normal alkane RI, polar column, temperature ramp

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Normal alkane RI, polar column, custom temperature program

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References

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Masuda, Nagano, et al., 1994
Masuda, N.; Nagano, Y.; Sakiyama, M., Standard molar enthalpy of formation of (CH₃)₂SO, dimethylsulfoxide, by combustion calorimetry, J. Chem. Thermodyn., 1994, 26, 971-975. [all data]

Lindberg and Stenholm, 1966
Lindberg, J.J.; Stenholm, V., Viscosities, Densities, and Related Properties of Binary Mixtures Containing Dimethyl Sulphoxide and Mono-Subst. Benzenes or Guaiacol, Suom. Kemistiseuran Tied., 1966, 75, 22. [all data]

Douglas, 1948
Douglas, T.B., Vapor Pressure of Methyl Sulfoxide from 20 to 50 deg. Calculation of the Heat of Vaporization, J. Am. Chem. Soc., 1948, 70, 2001. [all data]

Douglas, 1946
Douglas, T.B., Heats of Formation of Liquid Methyl Sulfoxide and Crystalline Methyl Sulfone at 18 deg., J. Am. Chem. Soc., 1946, 68, 1072. [all data]

Clever and Westrum, 1970
Clever, H.L.; Westrum, E.F., Dimethyl sulfoxide and dimethyl sulfone. Heat capacities, enthalpies of fusion, and thermodynamic properties., J. Phys. Chem., 1970, 74, 1309. [all data]

Douglas, 1948, 2
Douglas, T.B., Vapor pressure of methyl sulfoxide from 20 to 50°. Calculation of the heat of vaporization, J. Am. Chem. Soc., 1948, 70, 2001-20. [all data]

Douglas, 1948, 3
Douglas, Thomas B., Vapor Pressure of Methyl Sulfoxide from 20 to 50°. Calculation of the Heat of Vaporization, J. Am. Chem. Soc., 1948, 70, 6, 2001-2002, https://doi.org/10.1021/ja01186a005 . [all data]

Al-Najjar and Al-Sammerrai, 2007
Al-Najjar, Hazim; Al-Sammerrai, Dhoaib, Thermogravimetric determination of the heat of vaporization of some highly polar solvents, J. Chem. Technol. Biotechnol., 2007, 37, 3, 145-152, https://doi.org/10.1002/jctb.280370302 . [all data]

Dykyj, Svoboda, et al., 1999
Dykyj, J.; Svoboda, J.; Wilhoit, R.C.; Frenkel, M.L.; Hall, K.R., Vapor Pressure of Chemicals: Part A. Vapor Pressure and Antoine Constants for Hydrocarbons and Sulfur, Selenium, Tellurium and Hydrogen Containing Organic Compounds, Springer, Berlin, 1999, 373. [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

Sassa, Konishi, et al., 1974
Sassa, Yoshimasa; Konishi, Ryoichi; Katayama, Takashi, Isothermal vapor-liquid equilibrium data of DMSO [dimethyl sulfoxide] solutions by total pressure method. DMSO-acetone, DMSO-tetrahydrofuran, and DMSO-ethyl acetate systems, J. Chem. Eng. Data, 1974, 19, 1, 44-48, https://doi.org/10.1021/je60060a004 . [all data]

Jakli and Alexander Van Hook, 1972
Jakli, Gyorgy; Alexander Van Hook, W., The vapor pressures of dimethyl sulfoxide and hexadeuterodimethyl sulfoxide from about 313 to 453 K, The Journal of Chemical Thermodynamics, 1972, 4, 6, 857-864, https://doi.org/10.1016/0021-9614(72)90007-9 . [all data]

Boublik, Fried, et al., 1984
Boublik, T.; Fried, V.; Hala, E., The Vapour Pressures of Pure Substances: Selected Values of the Temperature Dependence of the Vapour Pressures of Some Pure Substances in the Normal and Low Pressure Region, 2nd ed., Elsevier, New York, 1984, 972. [all data]

NISHIMURA, NAKAYAMA, et al., 1972
NISHIMURA, MICHIKO; NAKAYAMA, MUTSUO; YANO, TAKEO, VAPOR PRESSURE OF PURE DMSO AND VAPOR-LIQUID EQUILIBRIA IN DMSO-H2O SYSTEM UNDER ISOBARIC CONDITIONS, J. Chem. Eng. Japan / JCEJ, 1972, 5, 3, 223-226, https://doi.org/10.1252/jcej.5.223 . [all data]

Meszaros, 1969
Meszaros, S., Period. Polytech., Chem. Eng., 1969, 13, 1-2, 79. [all data]

Jakli and van Hook, 1972
Jakli, G.; van Hook, W.A., The Vapor Pressures of Dimethyl Sulfoxide and Hexadeuterodimethyl Sulfoxide from about 313 to 453 K, J. Chem. Thermodyn., 1972, 4, 6, 857-864, https://doi.org/10.1016/0021-9614(72)90007-9 . [all data]

Clever and Westrum, 1970, 2
Clever, H.L.; Westrum, E.F., Jr., Dimethylsulfoxide and dimethylsulfone. Heat capacities, enthalpies of fusion, and thermodynamic properties, J. Phys. Chem., 1970, 74, 1309-1317. [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

Cumming and Kebarle, 1978
Cumming, J.B.; Kebarle, P., Summary of gas phase measurements involving acids AH. Entropy changes in proton transfer reactions involving negative ions. Bond dissociation energies D(A-H) and electron affinities EA(A), Can. J. Chem., 1978, 56, 1. [all data]

Sieck, 1985
Sieck, L.W., Thermochemistry of Solvation of NO₂^- and C₆H₅NO₂^- by Polar Molecules in the Vapor Phase. Comparison with Cl^- and Variation with Ligand Structure., J. Phys. Chem., 1985, 89, 25, 5552, https://doi.org/10.1021/j100271a049 . [all data]

Chowdhury, Grimsrud, et al., 1987
Chowdhury, S.; Grimsrud, E.P.; Kebarle, P., Bonding of Charged Delocalized Anions to Protic and Dipolar Aprotic Solvent Molecules, J. Phys. Chem., 1987, 91, 10, 2551, https://doi.org/10.1021/j100294a021 . [all data]

Chowdhury, 1987
Chowdhury, S. Grimsrud, Bonding of Charge Delocalized Anions to Protic and Dipolar Aprotic Solvents, J. Phys. Chem., 1987, 91, 10, 2551, https://doi.org/10.1021/j100294a021 . [all data]

Magnera, Caldwell, et al., 1984
Magnera, T.F.; Caldwell, G.; Sumner, J.; Ikuta, S.; Kebarle, P., Solvation of the halide anions in dimethyl sulfoxide. Factors involved in enhanced reactivity of negative ions in dipolar aprotic solvents, J. Am. Chem. Soc., 1984, 106, 6140. [all data]

Caldwell, Masucci, et al., 1989
Caldwell, G.W.; Masucci, J.A.; Ikonomou, M.G., Negative Ion Chemical Ionization Mass Spectrometry - Binding of Molecules to Bromide and Iodide Anions, Org. Mass Spectrom., 1989, 24, 1, 8, https://doi.org/10.1002/oms.1210240103 . [all data]

Lau, Saluja, et al., 1980
Lau, Y.K.; Saluja, P.P.S.; Kebarle, P., The Proton in Dimethyl Sulfoxide and Acetone. Results from Gas - Phase Ion Equilibria Involving (Me2SO)nH+ and (Me2CO)nH+, J. Am. Chem. Soc., 1980, 102, 25, 7429, https://doi.org/10.1021/ja00545a004 . [all data]

Sunner, 1984
Sunner, J. Kebarle, Ion - Solvent Molecule Interactions in the Gas Phase. The Potassium Ion and Me2SO, DMA, DMF, and Acetone, J. Am. Chem. Soc., 1984, 106, 21, 6135, https://doi.org/10.1021/ja00333a002 . [all data]

Klassen, Anderson, et al., 1996
Klassen, J.S.; Anderson, S.G.; Blades, A.T.; Kebarle, P., Reaction Enthalpies for M+L = M+ + L, Where M+ = Na+ and K+ and L = Acetamide, N-Methylacetamide, N,N-Dimethylacetamide, Glycine, and Glycylglycine, from Determinations of the Collision-Induced Dissociation Thresholds, J. Phys. Chem., 1996, 100, 33, 14218, https://doi.org/10.1021/jp9608382 . [all data]

Douglas, 1946, 2
Douglas, T.B., Heats of formation of liquid methyl sulfoxide and crystalline methyl sulfone at 18°, J. Am. Chem. Soc., 1946, 68, 1072-1076. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

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Notes

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, IR Spectrum, Mass spectrum (electron ionization), Gas Chromatography, References

• Symbols used in this document:
  

  T	Temperature
  Tboil	Boiling point
  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfusH	Enthalpy of fusion
  ΔfusS	Entropy of fusion
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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