S2 anion

Gas phase 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

Quantity Value Units Method Reference Comment
ΔfH°gas-7.8 ± 5.2kcal/molAcidMoran and Ellison, 1988 
ΔfH°gas<11.0 ± 2.3kcal/molIMRBDillard and Franklin, 1968S- + COS -> S2- + CO. Also S2- + COS -> S3- + CO, etc. to n=6

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:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
B - 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

(S2- • Carbon disulfide) + Carbon disulfide = (S2- • 2Carbon disulfide)

By formula: (S2- • CS2) + CS2 = (S2- • 2CS2)

Quantity Value Units Method Reference Comment
ΔrH°6.1kcal/molPHPMSHiraoka, Fujimaki, et al., 1994gas phase; Entropy change calculated or estimated; M
Quantity Value Units Method Reference Comment
ΔrS°20.cal/mol*KN/AHiraoka, Fujimaki, et al., 1994gas phase; Entropy change calculated or estimated; M

S2- + Hydrogen cation = HS2

By formula: S2- + H+ = HS2

Quantity Value Units Method Reference Comment
ΔrH°329.9 ± 3.7kcal/molD-EAMoran and Ellison, 1988gas phase; B
Quantity Value Units Method Reference Comment
ΔrG°>344.60kcal/molIMRBGoodings, Bohme, et al., 1986gas phase; S- deprotonates H2S, Sn- for n≥2, does not.; B

S2- + Carbon disulfide = (S2- • Carbon disulfide)

By formula: S2- + CS2 = (S2- • CS2)

Quantity Value Units Method Reference Comment
ΔrH°19.1kcal/molPHPMSHiraoka, Fujimaki, et al., 1994gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°29.cal/mol*KPHPMSHiraoka, Fujimaki, et al., 1994gas phase; M

(S2- • 4294967295sulfur) + sulfur = S2-

By formula: (S2- • 4294967295S) + S = S2-

Quantity Value Units Method Reference Comment
ΔrH°92.7 ± 5.2kcal/molN/AMoran and Ellison, 1988gas phase; B

S2- = CS4-

By formula: S2- = CS4-

Quantity Value Units Method Reference Comment
ΔrH°19.1 ± 1.5kcal/molTDAsHiraoka, Fujimaki, et al., 1994, 2gas phase; B

Constants of diatomic molecules

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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: Klaus P. Huber and Gerhard H. Herzberg

Data collected through July, 1977

Symbols used in the table of constants
SymbolMeaning
State electronic state and / or symmetry symbol
Te minimum electronic energy (cm-1)
ωe vibrational constant – first term (cm-1)
ωexe vibrational constant – second term (cm-1)
ωeye vibrational constant – third term (cm-1)
Be rotational constant in equilibrium position (cm-1)
αe rotational constant – first term (cm-1)
γe rotation-vibration interaction constant (cm-1)
De centrifugal distortion constant (cm-1)
βe rotational constant – first term, centrifugal force (cm-1)
re internuclear distance (Å)
Trans. observed transition(s) corresponding to electronic state
ν00 position of 0-0 band (units noted in table)
Diatomic constants for 32S2-
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
Constants for the following states are for S2- ions dissolved in KI crystals, from spectra studied at 2K Ikezawa and Rolfe, 1973 Vella and Rolfe, 1974; see also Sawicki and Fitchen, 1976. Host crystals other than KI lead to somewhat different values.
A' (2Πu) 20220 1 364.25 2 2.00        A' ← X 20102
↳Vella and Rolfe, 1974
A (2Πu) 20143          A → X' 19452
↳Ikezawa and Rolfe, 1973; Sawicki and Fitchen, 1976
           A ↔ X 20025
↳Rolfe, 1968; Ikezawa and Rolfe, 1973; Vella and Rolfe, 1974; Sawicki and Fitchen, 1976
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
X' (2Πg,i) 573 1 600.8 3.01       3  
↳Holzer, Murphy, et al., 1969; Sawicki and Fitchen, 1976
X (2Πg,i) 0 600.8 4 2.16       5  
↳Vannotti and Morton, 1967

Notes

1The splitting is due to the crystal field, not spin-orbit coupling which in the 2Πg state amounts to approximately -420 cm-1 Vannotti and Morton, 1967, Vella and Rolfe, 1974.
2The Raman spectrum of ions pumped into this state by laser irradiation consists of a sharp line shifted by 362 cm-1 Holzer, Racine, et al., 1973.
3Raman sp.
4 Holzer, Murphy, et al., 1969 predict a gas phase frequency ~550 cm-1.
5EPR sp.
6From D00(S2) and the electron affinities of S2 and S.
7From laser photodetachment experiments Celotta, Bennett, et al., 1974.

References

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

Moran and Ellison, 1988
Moran, S.; Ellison, G.B., Photoelectron Spectroscopy of Sulfur Ions, J. Phys. Chem., 1988, 92, 7, 1794, https://doi.org/10.1021/j100318a021 . [all data]

Dillard and Franklin, 1968
Dillard, J.G.; Franklin, J.L., Ion-Molecule Reactions of Negative Ions. I. Negative Ions of Sulfur, J. Chem. Phys., 1968, 48, 5, 2349, https://doi.org/10.1063/1.1669435 . [all data]

Hiraoka, Fujimaki, et al., 1994
Hiraoka, K.; Fujimaki, S.; Aruga, K.; Yamabe, S., Frontier-Controlled Structures of the Gas-Phase A+-(CS2)n Clusters ,A+- = S2+, CS2+, S2-, and CS2-, J. Phys. Chem., 1994, 98, 7, 1802, https://doi.org/10.1021/j100058a014 . [all data]

Goodings, Bohme, et al., 1986
Goodings, J.M.; Bohme, D.K.; Elguindi, K.; Fox, A., Sulphur Anion Chemistry in Hydrocarbon Flames with H2S, OCS, and SO2 Additives, Can. J. Chem., 1986, 64, 4, 689, https://doi.org/10.1139/v86-110 . [all data]

Hiraoka, Fujimaki, et al., 1994, 2
Hiraoka, K.; Fujimaki, S.; Aruga, K., Frontier-controlled Structures of the Gas Phas Clusters A+/-(CS2)n, A+/- = S2+, CS2+, S2-, and CS2-, J. Phys. Chem. (1994), 1994, 98, 7, 1802-1809, https://doi.org/10.1021/j100058a014 . [all data]

Ikezawa and Rolfe, 1973
Ikezawa, M.; Rolfe, J., Zero-phonon transitions in O2-, S2-, and Se2-, and SeS- molecules dissolved in alkali halide crystals, J. Chem. Phys., 1973, 58, 2024. [all data]

Vella and Rolfe, 1974
Vella, G.J.; Rolfe, J., Zero-phonon absorption transitions in S2- and Se2- molecules dissolved in potassium iodide crystals, J. Chem. Phys., 1974, 61, 41. [all data]

Sawicki and Fitchen, 1976
Sawicki, C.A.; Fitchen, D.B., Laser-excited spectra and reorientation of the S2- ion in alkali halides, J. Chem. Phys., 1976, 65, 11, 4497-4507. [all data]

Rolfe, 1968
Rolfe, J., Emission spectra of S2-, Se2-, and SeS- ions in KI crystals, J. Chem. Phys., 1968, 49, 4193. [all data]

Holzer, Murphy, et al., 1969
Holzer, W.; Murphy, W.F.; Bernstein, H.J., Raman spectra of negative molecular ions doped in alkali halide crystals, J. Mol. Spectrosc., 1969, 32, 13. [all data]

Vannotti and Morton, 1967
Vannotti, L.E.; Morton, J.R., Paramagnetic-resonance spectra of S2- in alkali halides, Phys. Rev., 1967, 161, 2, 282-286. [all data]

Holzer, Racine, et al., 1973
Holzer, W.; Racine, S.; Cipriani, J., Intensity and line shape study of resonance Raman effect of S2- and S3- doped in a potassium iodide single crystal in Advances in Raman Spectroscopy, J.P. Mathieu, ed(s)., Heyden & Son Ltd., New York, 1973, 393-400. [all data]

Celotta, Bennett, et al., 1974
Celotta, R.S.; Bennett, R.A.; Hall, J.L., Laser Photodetachment Determination of the Electron Affinities of OH, NH2, NH, SO2, and S2, J. Chem. Phys., 1974, 60, 5, 1740, https://doi.org/10.1063/1.1681268 . [all data]

Notes

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