Dihydrogen disulfide

• Formula: H₂S₂
• Molecular weight: 66.146
• IUPAC Standard InChI: InChI=1S/H2S2/c1-2/h1-2H Copy

  
• IUPAC Standard InChIKey: BWGNESOTFCXPMA-UHFFFAOYSA-N Copy
• CAS Registry Number: 13465-07-1
• 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.
• Species with the same structure:
  • Hydrogen persulfide
• Information on this page:
  • Phase change data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • References
  • Notes
• Data at other public NIST sites:
  • Computational Chemistry Comparison and Benchmark Database
  • Gas Phase Kinetics Database
• Options:
  • Switch to calorie-based units

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 by: William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

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 by: John E. Bartmess

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

HS₂^- +  =

By formula: HS₂^- + H⁺ = H₂S₂

Gas phase ion energetics 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
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi

View reactions leading to H₂S₂⁺ (ion structure unspecified)

Ionization energy determinations

De-protonation reactions

HS₂^- +  =

By formula: HS₂^- + H⁺ = H₂S₂

References

Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Notes

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

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]

Feh«65533»r and Hitzemann, 1958
Feh«65533»r, F.; Hitzemann, G., Beitr«65533»ge zur Chemie des Schwefels. 44. Verdampfungsenthalpien, Dampfdrucke, Siedepunkte, kritische Temperaturen und Drucke sowie Troutonsche Konstanten von Sulfanen, Z. Anorg. Allg. Chem., 1958, 294, 1-2, 50-62, https://doi.org/10.1002/zaac.19582940105 . [all data]

Entfellner and Boesl, 2009
Entfellner, M.; Boesl, U., Photodetachment-photoelectron spectroscopy of disulfanide: the ground and first excited electronic state of HS2 and DS2, Phys. Chem. Chem. Phys., 2009, 11, 15, 2657-2662, https://doi.org/10.1039/b820174a . [all data]

Ohair, Depuy, et al., 1993
Ohair, R.A.J.; Depuy, C.H.; Bierbaum, V.M., Gas-Phase Chemistry and Thermochemistry of the Hydroxysulfide Anion, HOS-, J. Phys. Chem., 1993, 97, 30, 7955, https://doi.org/10.1021/j100132a026 . [all data]

Wagner and Bock, 1974
Wagner, G.; Bock, H., Photoelektronenspektren und molekuleigenschaften, XXVI. Die delokalisation von schwefel-elektronenpaaren in alkylsulfiden und -disulfiden, Chem. Ber., 1974, 107, 68. [all data]

Notes

Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, References

• Symbols used in this document:
  

  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization

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