dihydrogen selenide

Formula: H₂Se
Molecular weight: 80.98
IUPAC Standard InChI: InChI=1S/H2Se/h1H2
IUPAC Standard InChIKey: SPVXKVOXSXTJOY-UHFFFAOYSA-N
CAS Registry Number: 7783-07-5
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.
Other names: Hydrogen selenide
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Reaction thermochemistry data

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Individual Reactions

HSe^- + = dihydrogen selenide

By formula: HSe^- + H⁺ = H₂Se

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	341.48 ± 0.70	kcal/mol	D-EA	Stoneman and Larson, 1986	gas phase; Wagman, Evans, et al., 1982 ΔHf(AH) = 7.1 kcal/mol
Δ_rH°	342.7 ± 9.1	kcal/mol	G+TS	Dixon, Holtz, et al., 1972	gas phase; Between H₂S, HCl; value altered from reference due to change in acidity scale
Δ_rH°	340.50	kcal/mol	N/A	Check, Faust, et al., 2001	gas phase; MnO-(t); ; ΔS(EA)=5.5
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	335.19 ± 0.80	kcal/mol	H-TS	Stoneman and Larson, 1986	gas phase; Wagman, Evans, et al., 1982 ΔHf(AH) = 7.1 kcal/mol
Δ_rG°	336.4 ± 9.0	kcal/mol	IMRB	Dixon, Holtz, et al., 1972	gas phase; Between H₂S, HCl; value altered from reference due to change in acidity scale
Δ_rG°	334.20	kcal/mol	N/A	Check, Faust, et al., 2001	gas phase; MnO-(t); ; ΔS(EA)=5.5

+ dihydrogen selenide = ( • )

By formula: NO₂^- + H₂Se = (NO₂^- • H₂Se)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	20.9 ± 1.0	kcal/mol	TDEq	Wlodek, Luczynski, et al., 1983	gas phase; Equilibration with SO2..NO2-
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	10.3 ± 3.5	kcal/mol	TDEq	Wlodek, Luczynski, et al., 1983	gas phase; Equilibration with SO2..NO2-

( • 2 dihydrogen selenide ) + = ( • 3)

By formula: (NO₂^- • 2H₂Se) + H₂Se = (NO₂^- • 3H₂Se)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.30 ± 0.70	kcal/mol	TDAs	Wlodek, Luczynski, et al., 1983	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	3.10 ± 0.50	kcal/mol	TDAs	Wlodek, Luczynski, et al., 1983	gas phase

( • dihydrogen selenide ) + = ( • 2)

By formula: (NO₃^- • H₂Se) + H₂Se = (NO₃^- • 2H₂Se)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.20 ± 0.50	kcal/mol	TDAs	Wlodek, Luczynski, et al., 1983	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	4.60 ± 0.70	kcal/mol	TDAs	Wlodek, Luczynski, et al., 1983	gas phase

( • dihydrogen selenide ) + = ( • 2)

By formula: (NO₂^- • H₂Se) + H₂Se = (NO₂^- • 2H₂Se)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.50 ± 0.50	kcal/mol	TDAs	Wlodek, Luczynski, et al., 1983	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	4.70 ± 0.30	kcal/mol	TDAs	Wlodek, Luczynski, et al., 1983	gas phase

+ dihydrogen selenide = ( • )

By formula: NO₃^- + H₂Se = (NO₃^- • H₂Se)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	17.20 ± 0.60	kcal/mol	TDAs	Wlodek, Luczynski, et al., 1983	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	7.60 ± 0.50	kcal/mol	TDAs	Wlodek, Luczynski, et al., 1983	gas phase

Gas phase ion energetics data

Go To: Top, Reaction thermochemistry data, References, Notes

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
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 H₂Se⁺ (ion structure unspecified)

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	9.892 ± 0.005	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	169.2	kcal/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	161.7	kcal/mol	N/A	Hunter and Lias, 1998	HL

Ionization energy determinations

IE (eV)	Method	Reference	Comment
9.886 ± 0.003	PI	Gibson, Greene, et al., 1986	LBLHLM
9.897 ± 0.002	TE	Borlin, Jungen, et al., 1986	LBLHLM
10.00 ± 0.05	EI	Balkis, Gaines, et al., 1976	LLK
9.93	PE	Natalis, 1973	LLK
9.88	PE	Potts and Price, 1972	LLK
9.93	PE	Delwiche, Natalis, et al., 1970	RDSH
9.882 ± 0.001	S	Price, Teegan, et al., 1950	RDSH

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
HSe⁺	13.266 ± 0.007	H	PI	Gibson, Greene, et al., 1986	LBLHLM
HSe⁺	13.6 ± 0.2	H	EI	Balkis, Gaines, et al., 1976	LLK
HSe⁺	13.8 ± 0.2	H	EI	Dixon, Holtz, et al., 1972	LLK
Se⁺	11.916 ± 0.006	H₂	PI	Gibson, Greene, et al., 1986	LBLHLM
Se⁺	12.6 ± 0.1	?	EI	Dixon, Holtz, et al., 1972	LLK

De-protonation reactions

HSe^- + = dihydrogen selenide

By formula: HSe^- + H⁺ = H₂Se

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	341.48 ± 0.70	kcal/mol	D-EA	Stoneman and Larson, 1986	gas phase; Wagman, Evans, et al., 1982 ΔHf(AH) = 7.1 kcal/mol; B
Δ_rH°	342.7 ± 9.1	kcal/mol	G+TS	Dixon, Holtz, et al., 1972	gas phase; Between H₂S, HCl; value altered from reference due to change in acidity scale; B
Δ_rH°	340.50	kcal/mol	N/A	Check, Faust, et al., 2001	gas phase; MnO-(t); ; ΔS(EA)=5.5; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	335.19 ± 0.80	kcal/mol	H-TS	Stoneman and Larson, 1986	gas phase; Wagman, Evans, et al., 1982 ΔHf(AH) = 7.1 kcal/mol; B
Δ_rG°	336.4 ± 9.0	kcal/mol	IMRB	Dixon, Holtz, et al., 1972	gas phase; Between H₂S, HCl; value altered from reference due to change in acidity scale; B
Δ_rG°	334.20	kcal/mol	N/A	Check, Faust, et al., 2001	gas phase; MnO-(t); ; ΔS(EA)=5.5; B

References

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

Stoneman and Larson, 1986
Stoneman, R.C.; Larson, D.J., Photodetachment spectroscopy of SeH^- in a magnetic field, J. Phys. B:, 1986, 19, 405. [all data]

Wagman, Evans, et al., 1982
Wagman, D.D.; Evans, W.H.; Parker, V.B.; Schumm, R.H.; Halow, I.; Bailey, S.M.; Churney, K.L.; Nuttall, R.L., The NBS Tables of Chemical Thermodynamic Properties (NBS Tech Note 270), J. Phys. Chem. Ref. Data, Supl. 1, 1982, 11. [all data]

Dixon, Holtz, et al., 1972
Dixon, D.A.; Holtz, D.; Beauchamp, J.L., Acidity, basicity, and gas-phase ion chemistry of hydrogen selenide by ion cyclotron resonance spectroscopy, Inorg. Chem., 1972, 11, 960. [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]

Wlodek, Luczynski, et al., 1983
Wlodek, S.; Luczynski, Z.; Wincel, H., Gas - Phase Solvation of NO2- and NO3- by Ethyl Nitrate, Int. J. Mass Spectrom. Ion Phys., 1983, 52, 2-3, 149, https://doi.org/10.1016/0020-7381(83)85036-0 . [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Gibson, Greene, et al., 1986
Gibson, S.T.; Greene, J.P.; Berkowitz, J., A photoionization study of SeH and H₂Se, J. Chem. Phys., 1986, 85, 4815. [all data]

Borlin, Jungen, et al., 1986
Borlin, K.; Jungen, M.; Karlsson, L.; Maripuu, R., Photoionization of H₂Se: High-resolution and threshold photoelectron spectra, Chem. Phys., 1986, 113, 309. [all data]

Balkis, Gaines, et al., 1976
Balkis, T.; Gaines, A.F.; Ozgen, G.; Ozgen, I.T.; Flowers, M.C., Ionization of hydrogen sul- phide, selenide and telluride by electron impact, J. Chem. Soc. Faraday Trans. 2, 1976, 72, 524. [all data]

Natalis, 1973
Natalis, P., Contribution a la spectroscopie photoelectronique. Effets de l'autoionisation dans less spectres photoelectroniques de molecules diatomiques et triatomiques, Acad. R. Belg. Mem. Cl. Sci. Collect. 8, 1973, 41, 1. [all data]

Potts and Price, 1972
Potts, A.W.; Price, W.C., Photoelectron spectra and valence shell orbital structures of groups V VI hydrides, Proc. R. Soc. London A:, 1972, 326, 181. [all data]

Delwiche, Natalis, et al., 1970
Delwiche, J.; Natalis, P.; Collin, J.E., High resolution photoelectron spectrometry of H₂S and H₂Se, Intern. J. Mass Spectrom. Ion Phys., 1970, 5, 443. [all data]

Price, Teegan, et al., 1950
Price, W.C.; Teegan, J.P.; Walsh, A.D., The far ultra-violet absorption spectra of the hydrides and deuterides of sulphur, selenium and tellurium and of the methyl derivatives of hydrogen sulphide, Proc. Roy. Soc. (London), 1950, A201, 600. [all data]

Notes

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Symbols used in this document:

AE Appearance energy

IE (evaluated) Recommended ionization energy

Δ_rG° Free energy of reaction at standard conditions

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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AE	Appearance energy
IE (evaluated)	Recommended ionization energy
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions