Mercapto radical

• Formula: HS
• Molecular weight: 33.073
• IUPAC Standard InChI: InChI=1S/HS/h1H Copy

  
• IUPAC Standard InChIKey: PXQLVRUNWNTZOS-UHFFFAOYSA-N Copy
• CAS Registry Number: 13940-21-1
• 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.
• Isotopologues:
  • Mercapto-d
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • Constants of diatomic molecules
  • References
  • Notes
• Data at other public NIST sites:
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  • Gas Phase Kinetics Database
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Gas phase thermochemistry data

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics 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.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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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

S^- +  =

By formula: S^- + H⁺ = HS

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Reaction 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 evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to HS⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

De-protonation reactions

S^- +  =

By formula: S^- + H⁺ = HS

Anion protonation reactions

HS^- +  =

By formula: HS^- + H⁺ = H₂S

Constants of diatomic molecules

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics 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 by: Klaus P. Huber and Gerhard H. Herzberg

Data collected through July, 1977

Notes

References

Go To: Top, Gas phase thermochemistry data, Reaction 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Blondel, Chaibi, et al., 2005
Blondel, C.; Chaibi, W.; Delsart, C.; Drag, C.; Goldfarb, F.; Kroger, S., The electron affinities of O, Si, and S revisited with the photodetachment microscope, Eur. Phys. J. D, 2005, 33, 3, 335-342, https://doi.org/10.1140/epjd/e2005-00069-9 . [all data]

Blondel, Delsart, et al., 2001
Blondel, C.; Delsart, C.; Goldfarb, F., Electron spectrometry at the mu eV level and the electron affinities of Si and F, J. Phys. B: Atom. Mol. Opt. Phys., 2001, 34, 9, L281-L288, https://doi.org/10.1088/0953-4075/34/9/101 . [all data]

Rempala and Ervin, 2000
Rempala, K.; Ervin, K.M., Collisional activation of the Endoergic Hydrogen Atom Transfer Reaction S-(2P) + H2 - SH- + H, J. Chem. Phys., 2000, 112, 10, 4579, https://doi.org/10.1063/1.481016 . [all data]

Chaibi, Delsart, et al., 2006
Chaibi, W.; Delsart, C.; Drag, C.; Blondel, C., High precision measurement of the (SH)-S-32 electron affinity by laser detachment microscopy, J. Molec. Spectros., 2006, 239, 1, 11-15, https://doi.org/10.1016/j.jms.2006.05.012 . [all data]

Breyer, Frey, et al., 1981
Breyer, F.; Frey, P.; Hotop, H., High Resolution Photoelectron Spectrometry of Negative Ions: Rotational Transitions in Laser-Photodetachment of OH-, SH-, and SD-, Z. Phys. A, 1981, 300, 1, 7, https://doi.org/10.1007/BF01412609 . [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]

Shiell, Hu, et al., 1900
Shiell, R.C.; Hu, X.K.; Hu, Q.J.; Hepburn, J.W., A determination of the bond dissociation energy (D-0(H-SH)): Threshold ion-pair production spectroscopy (TIPPS) of a triatomic molecule, J. Phys. Chem. A, 1900, 104, 19, 4339-4342, https://doi.org/10.1021/jp000025k . [all data]

Gurvich, Veyts, et al.
Gurvich, L.V.; Veyts, I.V.; Alcock, C.B., Hemisphere Publishing, NY, 1989, V. 1 2, Thermodynamic Properties of Individual Substances, 4th Ed. [all data]

Janousek and Brauman, 1981
Janousek, B.K.; Brauman, J.I., Electron Photodetachment from HS-. The Electron Affinity of HS, Phys. Rev. A, 1981, 23, 4, 1673, https://doi.org/10.1103/PhysRevA.23.1673 . [all data]

Eyler and Atkinson, 1974
Eyler, J.R.; Atkinson, G.H., Dye laser-induced photodetachment of electrons from SH- studied by ICR spectroscopy, Chem. Phys. Lett., 1974, 28, 217. [all data]

Steiner, 1968
Steiner, B., Photodetachment of Electrons From SH^-, J. Chem. Phys., 1968, 49, 11, 5097, https://doi.org/10.1063/1.1670004 . [all data]

Refaey, 1976
Refaey, K.M.A., Endoergic ion-molecule-collision processes of negative ions. II. Collisions of I- on H₂S, CS₂, and COS, J. Chem. Phys., 1976, 65, 2002. [all data]

Check, Faust, et al., 2001
Check, C.E.; Faust, T.O.; Bailey, J.M.; Wright, B.J.; Gilbert, T.M.; Sunderlin, L.S., Addition of Polarization and Diffuse Functions to the LANL2DZ Basis Set for P-Block Elements, J. Phys. Chem. A,, 2001, 105, 34, 8111, https://doi.org/10.1021/jp011945l . [all data]

Page and Goode, 1969
Page, F.M.; Goode, G.C., Negative Ions and the Magnetron., Wiley, NY, 1969. [all data]

Milan, Buma, et al., 1996
Milan, J.B.; Buma, W.J.; deLange, C.A., Zero-kinetic-energy pulsed-field ionization spectroscopy of the a ¹δ state of SH⁺ (CD⁺), J. Chem. Phys., 1996, 104, 521. [all data]

Hsu, Baldwin, et al., 1994
Hsu, C.-W.; Baldwin, D.P.; Liao, C.-L.; Ng, C.Y., Rotationally resolved nonresonant two-photon ionization of SH, J. Chem. Phys., 1994, 100, 8047. [all data]

Smith, Adams, et al., 1981
Smith, D.; Adams, N.G.; Lindinger, W., Reactions of the HnS ions (n = 0 to 3) with several molecular gases at thermal energies, J. Chem. Phys., 1981, 75, 3365. [all data]

Huber and Herzberg, 1979
Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules,, Van Nostrand Reinhold Co., 1979, ,1. [all data]

Dunlavey, Dyke, et al., 1979
Dunlavey, S.; Dyke, J.; Fayad, N.; Jonathan, N.; Morris, A., Vacuum ultraviolet photoelectron spectroscopy of transient species. Part 10. The SH(X2çi) radical and the S(3P) atom, Mol. Phys., 1979, 38, 729. [all data]

Morrow, 1966
Morrow, B.A., The absorption spectrum of SH and SD in the vacuum ultraviolet, Can. J. Phys., 1966, 44, 2447. [all data]

Palmer and Lossing, 1962
Palmer, T.F.; Lossing, F.P., Free radicals by mass spectrometry. XXVIII. The HS, CH₃S, and phenyl-S radicals: ionization potentials and heats of formation, J. Am. Chem. Soc., 1962, 84, 4661. [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]

Pathak and Palmer, 1969
Pathak, C.M.; Palmer, H.B., Chemical excitation of the A²Σ⁺-X²Π system of SH and SD, J. Mol. Spectrosc., 1969, 32, 157. [all data]

Acquista and Schoen, 1970
Acquista, N.; Schoen, L.J., Matrix isolation spectrum of the SH radical, J. Chem. Phys., 1970, 53, 1290. [all data]

Meerts and Dymanus, 1974
Meerts, W.L.; Dymanus, A., The hyperfine Λ-doubling spectrum of sulfur hydride in the ²Π_3/2 state, Astrophys. J., 1974, 187, 45. [all data]

Meerts and Dymanus, 1975
Meerts, W.L.; Dymanus, A., A molecular beam electric resonance study of the hyperfine Λ doubling spectrum of OH, OD, SH, and SD, Can. J. Phys., 1975, 53, 2123. [all data]

McDonald, 1963
McDonald, C.C., EPR spectra of SH, SD, and SO radicals in the gaseous state, J. Chem. Phys., 1963, 39, 2587. [all data]

Radford and Linzer, 1963
Radford, H.E.; Linzer, M., Radio spectrum of SH, Phys. Rev. Lett., 1963, 10, 443. [all data]

Uehara and Morino, 1970
Uehara, H.; Morino, Y., Gas-phase EPR spectra of rotationally excited states of SH and ClO free radicals, J. Mol. Spectrosc., 1970, 36, 158. [all data]

Brown and Thistlethwaite, 1972
Brown, J.M.; Thistlethwaite, P.J., A measurment of the λ-doubling transition frequencies for SH in its second rotational level, Mol. Phys., 1972, 23, 635. [all data]

Tanimoto and Uehara, 1973
Tanimoto, M.; Uehara, H., Proton hyperfine interactions in the gas-phase E.P.R. spectra of SH (²Π_3/2) in two lowest rotational levels, Mol. Phys., 1973, 25, 1193. [all data]

Ramsay, 1952
Ramsay, D.A., Absorption spectra of SH and SD produced by flash photolysis of H₂S and D₂S, J. Chem. Phys., 1952, 20, 1920. [all data]

Johns and Ramsay, 1961
Johns, J.W.C.; Ramsay, D.A., The absorption spectrum and dissociation energy of SH, Can. J. Phys., 1961, 39, 210. [all data]

Leach, 1950
Leach, M.S., Sur les spectres d'emission de l'hydrogene sulfure excites par chocs electroniques. Spectre d'emission du radical SH, Compt. Rend., 1950, 230, 2181. [all data]

Nicholls, Fraser, et al., 1960
Nicholls, R.W.; Fraser, P.A.; Jarmain, W.R.; McEachran, R.P., Vibrational transition probabilities of diatomic molecules: collected results. IV. BeO, BO, CH⁺, CO, NO, SH, O₂, O₂⁺, Astrophys. J., 1960, 131, 399. [all data]

Veseth, 1971
Veseth, L., Corrections to the spin-orbit splitting in ²Π states of diatomic molecules, J. Mol. Spectrosc., 1971, 38, 228. [all data]

Dibeler and Liston, 1968
Dibeler, V.H.; Liston, S.K., Mass-spectrometric study of photoionization. XI.Hydrogen sulfide and sulfur dioxide, J. Chem. Phys., 1968, 49, 482. [all data]

Meyer and Rosmus, 1975
Meyer, W.; Rosmus, P., PNO-Cl and CEPA studies of electron correlation effects. III. Spectroscopic constants and dipole moment functions for the ground states of the first-row and second-row diatomic hydrides, J. Chem. Phys., 1975, 63, 2356. [all data]

Carrington, Levy, et al., 1967
Carrington, A.; Levy, D.H.; Miller, T.A., Stark effect in gas-phase electron resonance. The dipole moments of ClO, BrO, SH, and ¹ΔSO, J. Chem. Phys., 1967, 47, 3801. [all data]

Byfleet, Carrington, et al., 1971
Byfleet, C.R.; Carrington, A.; Russell, D.K., Electric dipole moments of open-shell diatomic molecules, Mol. Phys., 1971, 20, 271. [all data]

Cade, Bader, et al., 1969
Cade, P.E.; Bader, R.F.W.; Henneker, W.H.; Keaveny, I., Molecular charge distributions and chemical binding. IV. The second-row diatomic hydrides AH, J. Chem. Phys., 1969, 50, 5313. [all data]

Miller, 1971
Miller, T.A., Sulfur-33 hyperfine interactions in the gas-phase electron resonance spectra of ²Π SH and ¹Δ SO, J. Chem. Phys., 1971, 54, 1658. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, References

• Symbols used in this document:
  

  EA	Electron affinity
  IE (evaluated)	Recommended ionization energy
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔfH(+) ion,0K	Enthalpy of formation of positive ion at 0K
  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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