Dihydrogen disulfide
- Formula: H2S2
- Molecular weight: 66.146
- IUPAC Standard InChIKey: BWGNESOTFCXPMA-UHFFFAOYSA-N
- 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
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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
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
8.13 | 271. | N/A | Dykyj, Svoboda, et al., 1999 | Based on data from 256. to 367. K. |
8.08 ± 0.02 | 293. | C | Feh«65533»r and Hitzemann, 1958 |
Gas phase ion energetics data
Go To: Top, Phase change data, References, Notes
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
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.3 | PE | Wagner and Bock, 1974 | LLK |
10.01 | PE | Wagner and Bock, 1974 | Vertical value; LLK |
De-protonation reactions
HS2- + =
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 345.8 ± 3.6 | kcal/mol | D-EA | Entfellner and Boesl, 2009 | gas phase; B |
ΔrH° | 346.0 ± 3.1 | kcal/mol | G+TS | Ohair, Depuy, et al., 1993 | gas phase; B |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | 338.8 ± 3.7 | kcal/mol | H-TS | Entfellner and Boesl, 2009 | gas phase; B |
ΔrG° | 339.0 ± 3.0 | kcal/mol | IMRB | Ohair, Depuy, et al., 1993 | gas phase; B |
References
Go To: Top, Phase change 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]
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]
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]
Notes
Go To: Top, Phase change 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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