Hydrogen anion

• Formula: H^-
• Molecular weight: 1.00849
• IUPAC Standard InChI: InChI=1S/H/q-1 Copy

  
• IUPAC Standard InChIKey: KLGZELKXQMTEMM-UHFFFAOYSA-N Copy
• CAS Registry Number: 12184-88-2
• Chemical structure:
  This structure is also available as a 2d Mol file
• Isotopologues:
  • Deuterium anion
• 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
  • References
  • Notes
• Other data available:
  • Gas phase ion energetics data
  • Ion clustering data
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Gas phase thermochemistry data

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

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

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry 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
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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

 +  =

By formula: H^- + H⁺ = H₂

Quantity	Value	Units	Method	Reference	Comment
rH°	1675.3	kJ/mol	N/A	Shiell, Hu, et al., 2000	gas phase; Given: 139714.8±1 cm-1 at 0K, or 399.465±0.003 kcal/mol; B
rH°	1675.3	kJ/mol	N/A	Pratt, McCormack, et al., 1992	gas phase; 399.46±0.01 kcal/mol at 0K; 0.94 correction, Gurvich, Veyts, et al.; B
rH°	1675.3	kJ/mol	D-EA	Lykke, Murray, et al., 1991	gas phase; Reported: 6082.99±0.15 cm-1, or 0.754195(18) eV; B
Quantity	Value	Units	Method	Reference	Comment
rG°	1649.3 ± 0.42	kJ/mol	H-TS	Shiell, Hu, et al., 2000	gas phase; Given: 139714.8±1 cm-1 at 0K, or 399.465±0.003 kcal/mol; B
rG°	1649.3	kJ/mol	H-TS	Lykke, Murray, et al., 1991	gas phase; Reported: 6082.99±0.15 cm-1, or 0.754195(18) eV; B

 +  = (  )

By formula: H^- + H₃B = (H^-  H₃B)

Quantity	Value	Units	Method	Reference	Comment
rH°	310. ± 12.	kJ/mol	Endo	Workman and Squires, 1988	gas phase; From Endo threshold for hydride transfer to CO2; B
rH°	322. ± 8.4	kJ/mol	Ther	Krivtsov, Titova, et al., 1977	gas phase; value altered from reference due to conversion from electron convention to ion convention; B
rH°	341.4	kJ/mol	Ther	Altschuller, 1955	gas phase; B

 +  = (  )

By formula: H^- + H₂O = (H^-  H₂O)

Quantity	Value	Units	Method	Reference	Comment
rH°	74.1 ± 8.4	kJ/mol	N/A	Miller, Leopold, et al., 1985	gas phase; EA given is Vertical Detachment Energy. Est. Adiabatic: 1.40 eV, 32.3 kcal/mol; B
rH°	72. ± 15.	kJ/mol	Ther	Paulson and Henchman, 1984	gas phase; HOH..HO- + H2 ->. See also Griffiths and Harris, 1989; B,M
rH°	57.74	kJ/mol	CIDT	Paulson and Henchman, 1982	gas phase; B

 + CAS Reg. No. 10177-98-7 = (  CAS Reg. No. 10177-98-7)

By formula: H^- + CAS Reg. No. 10177-98-7 = (H^-  CAS Reg. No. 10177-98-7)

Quantity	Value	Units	Method	Reference	Comment
rH°	84. ± 17.	kJ/mol	IMRB	Hajdasz, Ho, et al., 1994	gas phase; affinity order: Et3SiH<=Et2SiH2<=nPnSiH3<=SiH4. nPnSiH3 is 0.4±0.2 kcal/mol > Et3SiH in «DELTA»G. Et3SiH dHf(77PR) is wrong.; B
rH°	45. ± 23.	kJ/mol	IMRB	Hajdasz and Squires, 1986	gas phase; B

 +  = (  )

By formula: H^- + C₆H₁₆Si = (H^-  C₆H₁₆Si)

Quantity	Value	Units	Method	Reference	Comment
rH°	84. ± 17.	kJ/mol	IMRB	Hajdasz, Ho, et al., 1994	gas phase; affinity order: Et3SiH<=Et2SiH2<=nPnSiH3<=SiH4. nPnSiH3 is 0.4±0.2 kcal/mol > Et3SiH in «DELTA»G. Et3SiH dHf(77PR) is wrong.; B
rH°	43. ± 23.	kJ/mol	IMRB	Hajdasz and Squires, 1986	gas phase; B

 +  = (  )

By formula: H^- + H₄Si = (H^-  H₄Si)

Quantity	Value	Units	Method	Reference	Comment
rH°	79. ± 17.	kJ/mol	IMRB	Hajdasz, Ho, et al., 1994	gas phase; B
rH°	94. ± 19.	kJ/mol	IMRE	Hajdasz and Squires, 1986	gas phase; QCISD Calculation: H-A = 20.2, 99MOC; B
Quantity	Value	Units	Method	Reference	Comment
rG°	49. ± 17.	kJ/mol	IMRB	Hajdasz, Ho, et al., 1994	gas phase; B

 +  = (  )

By formula: H^- + C₄H₁₂Si = (H^-  C₄H₁₂Si)

Quantity	Value	Units	Method	Reference	Comment
rH°	84. ± 17.	kJ/mol	IMRB	Hajdasz, Ho, et al., 1994	gas phase; Hydride affinity order: Et3SiH<=Et2SiH2<=nPnSiH3<=SiH4. dHf(Et2SiH2) in 77Ped/Ryl is 10 kcal/mol too negative, relative to Me2SiH2.Group Additivity imples ca. -25 kcal/mol.; B

 +  = (  )

By formula: H^- + H₃N = (H^-  H₃N)

Quantity	Value	Units	Method	Reference	Comment
rH°	29.7	kJ/mol	Est	Snodgrass, Coe, et al., 1995	gas phase; Stated electron affinity is the Vertical Detachment Energy; B
rH°	35.	kJ/mol	PES	Coe, Snodgrass, et al., 1985	gas phase; «DELTA»rH<; M

 +  = (  )

By formula: H^- + C₃H₉Al = (H^-  C₃H₉Al)

Quantity	Value	Units	Method	Reference	Comment
rH°	>354.8 ± 2.1	kJ/mol	IMRB	den Berg, Ingemann, et al., 1992	gas phase; Hydride affinity > (CF3)2CO. Computations indicate HOF(A-) ca. -46 kcal/mol, dHaff ca. 74 kcal/mol; B

(  ) +  = (  2)

By formula: (H^-  H₃N) + H₃N = (H^-  2H₃N)

Quantity	Value	Units	Method	Reference	Comment
rH°	33.9	kJ/mol	Est	Snodgrass, Coe, et al., 1995	gas phase; Affinity: shift in apparent EA from lesser-solvated ion. Ignores any neutral-neutral bond.; B

 +  = (  )

By formula: H^- + O₂S = (H^-  O₂S)

Quantity	Value	Units	Method	Reference	Comment
rH°	260. ± 67.	kJ/mol	IMRB	Sheldon, Currie, et al., 1985	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
rG°	240. ± 67.	kJ/mol	IMRB	Sheldon, Currie, et al., 1985	gas phase; B

 +  = (  )

By formula: H^- + C₆H₁₅B = (H^-  C₆H₁₅B)

Quantity	Value	Units	Method	Reference	Comment
rH°	290. ± 10.	kJ/mol	Endo	Workman and Squires, 1988	gas phase; From Endo threshold for hydride transfer to CO2; B

 +  = (  )

By formula: H^- + C₆MoO₆ = (H^-  C₆MoO₆)

Quantity	Value	Units	Method	Reference	Comment
rH°	184. ± 17.	kJ/mol	N/A	Lane and Squires, 1988	gas phase; Hydride affinity between CH2=O and PhCH=O; B

 +  = (  )

By formula: H^- + C₆O₆W = (H^-  C₆O₆W)

Quantity	Value	Units	Method	Reference	Comment
rH°	184. ± 17.	kJ/mol	N/A	Lane and Squires, 1988	gas phase; Hydride affinity between CH2=O and PhCH=O; B

 +  = (  )

By formula: H^- + H₆B₂ = (H^-  H₆B₂)

Quantity	Value	Units	Method	Reference	Comment
rH°	309.6	kJ/mol	Ther	Workman and Squires, 1988	gas phase; Calculated from data on BH3..BH4-; B

= C₇H₁₅O^-

By formula: H^- = C₇H₁₅O^-

Quantity	Value	Units	Method	Reference	Comment
rH°	181. ± 14.	kJ/mol	N/A	Boand, Houriet, et al., 1983	gas phase; value altered from reference due to change in acidity scale; B

 + CH₂BN = (  CH₂BN)

By formula: H^- + CH₂BN = (H^-  CH₂BN)

Quantity	Value	Units	Method	Reference	Comment
rH°	112.5	kJ/mol	N/A	Workman and Squires, 1988	gas phase; Calculated from data on BH3..CN-; B

= C₇H₁₃O^-

By formula: H^- = C₇H₁₃O^-

Quantity	Value	Units	Method	Reference	Comment
rH°	154. ± 9.6	kJ/mol	N/A	Haas and Harrison, 1993	gas phase; Both metastable and 50 eV collision energy.; B

 +  = (  )

By formula: H^- + C₅FeO₅ = (H^-  C₅FeO₅)

Quantity	Value	Units	Method	Reference	Comment
rH°	235. ± 13.	kJ/mol	IMRB	Lane, Sallans, et al., 1985	gas phase; B

 +  = (  )

By formula: H^- + HO = (H^-  HO)

Quantity	Value	Units	Method	Reference	Comment
rH°	217. ± 17.	kJ/mol	Ther	de Koening and Nibbering, 1984	gas phase; B

 + H₆Al₂ = H₇Al₂^-

By formula: H^- + H₆Al₂ = H₇Al₂^-

Quantity	Value	Units	Method	Reference	Comment
rH°	322. ± 17.	kJ/mol	CIDT	Goebbert, Hernandez, et al., 2005	gas phase; B

 +  = H₄Al^-

By formula: H^- + H₃Al = H₄Al^-

Quantity	Value	Units	Method	Reference	Comment
rH°	314. ± 17.	kJ/mol	CIDT	Goebbert, Hernandez, et al., 2005	gas phase; B

 +  = C₆H₆F₃Si^-

By formula: H^- + C₆H₅F₃Si = C₆H₆F₃Si^-

Quantity	Value	Units	Method	Reference	Comment
rH°	268. ± 13.	kJ/mol	CIDT	Krouse, Lardin, et al., 2003	gas phase; B

References

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

Shiell, Hu, et al., 2000
Shiell, R.C.; Hu, X.K.; Hu, Q.C.J.; Hepburn, J.W., Threshold Ion-pair Production spectroscopy (TIPPS) of H2 and D2, Faraday Disc. Chem. Soc., 2000, 115, 331, https://doi.org/10.1039/a909428h . [all data]

Pratt, McCormack, et al., 1992
Pratt, S.T.; McCormack, E.F.; Dehmer, J.L.; Dehmer, P.M., Field-Induced Ion-Pair Formation in Molecular Hydrogen, Phys. Rev. Lett., 1992, 68, 5, 584, https://doi.org/10.1103/PhysRevLett.68.584 . [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]

Lykke, Murray, et al., 1991
Lykke, K.R.; Murray, K.K.; Lineberger, W.C., Threshold Photodetachment of H-, Phys. Rev. A, 1991, 43, 11, 6104, https://doi.org/10.1103/PhysRevA.43.6104 . [all data]

Workman and Squires, 1988
Workman, D.B.; Squires, R.R., Hydride Binding Energies of Boranes, Inorg. Chem., 1988, 27, 11, 1846, https://doi.org/10.1021/ic00284a003 . [all data]

Krivtsov, Titova, et al., 1977
Krivtsov, N.V.; Titova, K.V.; Rosolovskii, V.Ya., Thermochemical study of complex borates, Russ. J. Inorg. Chem., 1977, 22, 374. [all data]

Altschuller, 1955
Altschuller, A.P., Lattice Energies and Related Thermodynamic Properties of the Alkali Metal Borohydrides and of the Borohydride Ion, J. Am. Chem. Soc., 1955, 77, 21, 5455, https://doi.org/10.1021/ja01626a001 . [all data]

Miller, Leopold, et al., 1985
Miller, T.M.; Leopold, D.G.; Murray, K.K.; Lineberger, W.C., The Photoelectron Spectrum of H3O-, Bull. Am. Phys. Soc., 1985, 30, 880. [all data]

Paulson and Henchman, 1984
Paulson, J.F.; Henchman, M.J., On the Formation of H₃O^- in an Ion-Molecule Reaction in Ionic Processes in the Gas Phase,, M.A. Almoster Ferreira, Ed., Reidel, Dordrecht,, 1984, 331. [all data]

Griffiths and Harris, 1989
Griffiths, W.J.; Harris, F.M., Amended Interpretation of the Results Obtained in an Experimental Investigation of the Structure of the H3O- Ion, Int. J. Mass Spectrom. Ion Proc., 1989, 87, 1, R25, https://doi.org/10.1016/0168-1176(89)80017-5 . [all data]

Paulson and Henchman, 1982
Paulson, J.F.; Henchman, M.J., The Hydrated Negative Hydrogen Ion, Bull. Am. Phys. Soc., 1982, 27, 108. [all data]

Hajdasz, Ho, et al., 1994
Hajdasz, D.J.; Ho, Y.; Squires, R.R., Gas-Phase Chemistry of Pentacoordinate Silicon Hydrides, J. Am. Chem. Soc., 1994, 116, 23, 10751, https://doi.org/10.1021/ja00102a045 . [all data]

Hajdasz and Squires, 1986
Hajdasz, D.J.; Squires, R.R., Hypervalent silicon hydrides: SiH₅^-, J. Am. Chem. Soc., 1986, 108, 3139. [all data]

Snodgrass, Coe, et al., 1995
Snodgrass, J.T.; Coe, J.V.; Freidhoff, C.B.; Mchugh, K.M.; Arnold, S.T.; Bowen, K.H., Negative ion photoelectron spectroscopy of NH2-(NH3)1 and NH2-(NH3)2: Gas phase basicities of partially solvated anions, J. Phys. Chem., 1995, 99, 24, 9675, https://doi.org/10.1021/j100024a006 . [all data]

Coe, Snodgrass, et al., 1985
Coe, J.V.; Snodgrass, J.T.; Friedhoff, C.B.; McHugh, K.M.; Bowen, K.H., Negative ion photoelectron spectroscopy of the negative ion H-(NH₃), J. Chem. Phys., 1985, 83, 3169. [all data]

den Berg, Ingemann, et al., 1992
den Berg, K.J. van; Ingemann, S.; Nibbering, N.M.M., Gas Phase Reactions of Negative Ions with Trimethylaluminum: Formation and Reactivity of the Me3AlH- Ion., Org. Mass Spectrom., 1992, 27, 4, 523, https://doi.org/10.1002/oms.1210270427 . [all data]

Sheldon, Currie, et al., 1985
Sheldon, J.C.; Currie, G.J.; Lahnstein, J.; Hayes, R.N.; Bowie, J.H., Gas Phase Ion Chemistry of Ambident Nucleophiles. Reactions of Alkoxide and Thiomethoxide Negative Ions with Hydrogen Free Molecules., Nouv. J. Chem., 1985, 9, 205. [all data]

Lane and Squires, 1988
Lane, K.R.; Squires, R.R., Hydride Transfer to Transition Metal Carbonyls in the Gas Phase. Formation and Relative Stabilities of Anionic Formyl Complexes, Polyhedron, 1988, 7, 16-17, 1609, https://doi.org/10.1016/S0277-5387(00)81786-6 . [all data]

Boand, Houriet, et al., 1983
Boand, G.; Houriet, R.; Baumann, T., The gas phase acidity of aliphatic alcohols, J. Am. Chem. Soc., 1983, 105, 2203. [all data]

Haas and Harrison, 1993
Haas, M.J.; Harrison, A.G., The Fragmentation of Proton-Bound Cluster Ions and the Gas-Phase Acidities of Alcohols, Int. J. Mass Spectrom. Ion Proc., 1993, 124, 2, 115, https://doi.org/10.1016/0168-1176(93)80003-W . [all data]

Lane, Sallans, et al., 1985
Lane, K.R.; Sallans, L.; Squires, R.R., Anion affinities of transition metal carbonyls. A thermochemical correlation for iron tetracarbonyl acyl negative ions, J. Am. Chem. Soc., 1985, 107, 5369. [all data]

de Koening and Nibbering, 1984
de Koening, L.J.; Nibbering, N.M.M., Formation of the Long-Lived H₂O^-. Ion in the Gas Phase, J. Am. Chem. Soc., 1984, 106, 25, 7971, https://doi.org/10.1021/ja00337a054 . [all data]

Goebbert, Hernandez, et al., 2005
Goebbert, D.J.; Hernandez, H.; Francisco, J.S.; Wenthold, P.G., The binding energy and bonding in dialane, J. Am. Chem. Soc., 2005, 127, 33, 11684-11689, https://doi.org/10.1021/ja0424070 . [all data]

Krouse, Lardin, et al., 2003
Krouse, I.H.; Lardin, H.A.; Wenthold, P.G., Gas-phase ion chemistry and ion thermochemistry of phenyltrifluorosilane, Int. J. Mass Spectrom., 2003, 227, 3, 303-314, https://doi.org/10.1016/S1387-3806(03)00080-0 . [all data]

Notes

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

• Symbols used in this document:
  

  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  rG°	Free energy of reaction at standard conditions
  rH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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