S2 anion
- Formula: S2-
- Molecular weight: 64.131
- CAS Registry Number: 12185-15-8
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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 ± 5.2 | kcal/mol | Acid | Moran and Ellison, 1988 | |
ΔfH°gas | <11.0 ± 2.3 | kcal/mol | IMRB | Dillard and Franklin, 1968 | S- + COS -> S2- + CO. Also S2- + COS -> S3- + CO, etc. to n=6 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, 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: John E. Bartmess
Protonation reactions
S2- + = HS2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 329.9 ± 3.7 | kcal/mol | D-EA | Moran and Ellison, 1988 | gas phase |
Quantity | Value | Units | Method | Reference | Comment |
ΔrG° | >344.60 | kcal/mol | IMRB | Goodings, Bohme, et al., 1986 | gas phase; S- deprotonates H2S, Sn- for n≥2, does not. |
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
Symbol | Meaning |
---|---|
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) |
State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | 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 | ||||||||||||
State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | 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
1 | The 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. |
2 | The 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. |
3 | Raman sp. |
4 | Holzer, Murphy, et al., 1969 predict a gas phase frequency ~550 cm-1. |
5 | EPR sp. |
6 | From D00(S2) and the electron affinities of S2 and S. |
7 | From laser photodetachment experiments Celotta, Bennett, et al., 1974. |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, Notes
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]
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]
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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- Symbols used in this document:
ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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