Germane

• Formula: GeH₄
• Molecular weight: 76.67
• IUPAC Standard InChI:
  

  InChI=1S/GeH4/h1H4 Download the identifier in a file.

• IUPAC Standard InChIKey: QUZPNFFHZPRKJD-UHFFFAOYSA-N
• CAS Registry Number: 7782-65-2
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
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• Other names: germanium tetrahydride
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• Information on this page:
  • Reaction thermochemistry data
  • References
  • Notes
• Other data available:
  • Phase change data
  • Gas phase ion energetics data
  • IR Spectrum
  • Vibrational and/or electronic energy levels
• Data at other public NIST sites:
  • Electron-Impact Ionization Cross Sections (on physics web site)
  • Gas Phase Kinetics Database
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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 as indicated in comments:
B - John E. Bartmess
MS - José A. Martinho Simões

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

H₃Ge^- +  =

By formula: H₃Ge^- + H⁺ = H₄Ge

Quantity	Value	Units	Method	Reference	Comment
rH°	358.7 ± 2.1	kcal/mol	G+TS	Gal, Decouzon, et al., 2001	gas phase; B
rH°	358.9 ± 1.3	kcal/mol	G+TS	Decouzon, Gal, et al., 1993	gas phase; The neutral acid «DELTA»Hf may be ca. 4 kcal/mol too positive: G2 calculations, Mayer, Gal, et al., 1997; B
rH°	>356.0 ± 2.7	kcal/mol	D-EA	Reed and Brauman, 1974	gas phase; B
rH°	362.00	kcal/mol	N/A	Check, Faust, et al., 2001	gas phase; Fe(CO)-(q); ; «DELTA»S(EA)=5.0; B
Quantity	Value	Units	Method	Reference	Comment
rG°	350.6 ± 2.0	kcal/mol	IMRE	Gal, Decouzon, et al., 2001	gas phase; B
rG°	350.8 ± 1.2	kcal/mol	IMRE	Decouzon, Gal, et al., 1993	gas phase; The neutral acid «DELTA»Hf may be ca. 4 kcal/mol too positive: G2 calculations, Mayer, Gal, et al., 1997; B
rG°	>347.9 ± 2.8	kcal/mol	H-TS	Reed and Brauman, 1974	gas phase; B
rG°	353.90	kcal/mol	N/A	Check, Faust, et al., 2001	gas phase; Fe(CO)-(q); ; «DELTA»S(EA)=5.0; B

 (g) =  (g) +  (g)

By formula: H₄Ge (g) = H (g) + H₃Ge (g)

Quantity	Value	Units	Method	Reference	Comment
rH°	83.4 ± 2.0	kcal/mol	PIMS	Berkowitz, Ellison, et al., 1994	Please also see Ruscic, Schwarz, et al., 1990. Value recommended in the critical survey Berkowitz, Ellison, et al., 1994.; MS
rH°	<85.6	kcal/mol	PIMS	Ruscic, Schwarz, et al., 1990	Temperature: 0 K. A value of 82. ± 2. kcal/mol is recommended in Ruscic, Schwarz, et al., 1990.; MS

 (g) +  (g) =  (g) +  (g)

By formula: I (g) + H₄Ge (g) = HI (g) + H₃Ge (g)

Quantity	Value	Units	Method	Reference	Comment
rH°	11.2 ± 0.98	kcal/mol	KinG	Noble and Walsh, 1983	MS

References

Go To: Top, Reaction thermochemistry data, Notes

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

Gal, Decouzon, et al., 2001
Gal, J.F.; Decouzon, M.; Maria, P.C.; Gonzalez, A.I.; Mo, O.; Yanez, M.; El Chaouch, S.; Guillemin, J.C., Acidity trends in alpha,beta-unsaturated alkanes, silanes, germanes, and stannanes, J. Am. Chem. Soc., 2001, 123, 26, 6353-6359, https://doi.org/10.1021/ja004079j . [all data]

Decouzon, Gal, et al., 1993
Decouzon, M.; Gal, J.F.; Gayraud, J.; Maria, P.C.; Vaglio, G.A.; Volpe, P., Fourier Transform-Ion Cyclotron Resonance Study of the Gas-Phase Acidities of Germane and Methylgermane - Bond Dissociation Energy of German, J. Am. Soc. Mass Spectrom., 1993, 4, 1, 54, https://doi.org/10.1016/1044-0305(93)85042-V . [all data]

Mayer, Gal, et al., 1997
Mayer, P.M.; Gal, J.-F.; Radom, L., The Heats of Formation, Gas-phase Acidities, and Related Thermochemical Properties of the Third-row Hydrides GeH4, AsH3, SeH2, and HBr from G2 ab initio Calculations, Int. J. Mass Spectrom. Ion Proc., 1997, 167/168, 689, https://doi.org/10.1016/S0168-1176(97)00127-4 . [all data]

Reed and Brauman, 1974
Reed, K.J.; Brauman, J.I., Photodetachment of electrons from Group IVa binary hydride anions: The electron affinities of the SiH₃ and GeH₃ radicals, J. Chem. Phys., 1974, 61, 4830. [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]

Berkowitz, Ellison, et al., 1994
Berkowitz, J.; Ellison, G.B.; Gutman, D., Three methods to measure RH bond energies, J. Phys. Chem., 1994, 98, 2744. [all data]

Ruscic, Schwarz, et al., 1990
Ruscic, B.; Schwarz, M.; Berkowitz, J., Photoionization studies of GeH_n(n = 2-4), J. Chem. Phys., 1990, 92, 1865. [all data]

Noble and Walsh, 1983
Noble, P.N.; Walsh, R., Kinetics of the gas phase reaction between iodine and monogermane and the bond dissociation energy D(H₃Ge-H), Int. J. Chem. Kinet., 1983, 15, 547. [all data]

Notes

Go To: Top, Reaction thermochemistry data, References

• Symbols used in this document:
  

  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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