Germylene

Formula: GeH₂
Molecular weight: 74.66
IUPAC Standard InChI: InChI=1S/GeH2/h1H2
IUPAC Standard InChIKey: MWRNXFLKMVJUFL-UHFFFAOYSA-N
CAS Registry Number: 24968-55-6
Chemical structure:
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Reaction thermochemistry data

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Data compiled by: José A. Martinho Simões

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Individual Reactions

(g) = (g) + Germylene (g)

By formula: H₃Ge (g) = H (g) + H₂Ge (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	>56.4	kcal/mol	PIMS	Ruscic, Schwarz, et al., 1990	Temperature: 0 K. A value of 59.0 kcal/mol is recommended in Ruscic, Schwarz, et al., 1990.

Germylene (g) = HGe (g) + (g)

By formula: H₂Ge (g) = HGe (g) + H (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	<68.8	kcal/mol	PIMS	Ruscic, Schwarz, et al., 1990	Temperature: 0 K. A value of 66.2 kcal/mol is recommended in Ruscic, Schwarz, et al., 1990.

Gas phase ion energetics data

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Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
B - John E. Bartmess

View reactions leading to H₂Ge⁺ (ion structure unspecified)

Electron affinity determinations

EA (eV)	Method	Reference	Comment
1.0970 ± 0.0027	LPES	Miller, Miller, et al., 1986	B

Ionization energy determinations

IE (eV)	Method	Reference	Comment
≤9.25	PI	Ruscic, Schwarz, et al., 1990	LL

Vibrational and/or electronic energy levels

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Data compiled by: Marilyn E. Jacox

State: A

Energy (cm^-1)	Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 16325.54	gas	A-X	489	850	Saito and Obi, 1993
					Saito and Obi, 1994
					Karolczak, Harper, et al., 1995
					Campargue and Escribano, 1999
					Smith, Clouthier, et al., 2000

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


a₁	1	Sym. stretch	1798.4	gas	LF	Karolczak, Harper, et al., 1995
	2	Bend	783.0	gas	LF	Saito and Obi, 1993 Saito and Obi, 1994 Karolczak, Harper, et al., 1995

State: X

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


a₁	1	Sym. stretch	1856	gas	LF	Smith, Clouthier, et al., 2000
	1	Sym. stretch	1862.5	Ne	IR	Wang, Andrews, et al., 2002
	1	Sym. stretch	1860.4	Ne	IR	Wang, Andrews, et al., 2002
	1	Sym. stretch	1839.2	Ar	IR	Wang, Andrews, et al., 2002
	1	Sym. stretch	1858.5	H₂	IR	Wang and Andrews, 2003
	1	Sym. stretch	1854.5	H₂	IR	Wang and Andrews, 2003
	2	Bend	916	gas	LF	Saito and Obi, 1993 Smith, Clouthier, et al., 2000
	2	Bend	921.5	Ne	IR	Wang, Andrews, et al., 2002
	2	Bend	913.6	Ar	IR	Wang, Andrews, et al., 2002
	2	Bend	902.8	H₂	IR	Wang and Andrews, 2003
b₂	3	Asym. stretch	1862.5	Ne	IR	Wang, Andrews, et al., 2002
	3	Asym. stretch	1860.4	Ne	IR	Wang, Andrews, et al., 2002
	3	Asym. stretch	1839.2	Ar	IR	Wang, Andrews, et al., 2002
	3	Asym. stretch	1858.5	H₂	IR	Wang and Andrews, 2003
	3	Asym. stretch	1854.5	H₂	IR	Wang and Andrews, 2003

Additional references: Jacox, 1994, page 20; Jacox, 1998, page 132; Jacox, 2003, page 18; Smith and Guillory, 1972; Lloret, Oria, et al., 1991

Notes

Energy separation between the v = 0 levels of the excited and electronic ground states.

References

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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]

Miller, Miller, et al., 1986
Miller, T.M.; Miller, A.E.S.; Lineberger, W.C., Electron Affinities of Ge and Sn, Phys. Rev. A, 1986, 33, 5, 3558, https://doi.org/10.1103/PhysRevA.33.3558 . [all data]

Saito and Obi, 1993
Saito, K.; Obi, K., The first observation of the Ã 1B1-X 1A1 transition of GeH2 and GeD2 radicals, Chem. Phys. Lett., 1993, 215, 1-3, 193, https://doi.org/10.1016/0009-2614(93)89287-R . [all data]

Saito and Obi, 1994
Saito, K.; Obi, K., The excited state dynamics of the Ã1B1 state of GeH2 and GeD2 radicals, Chem. Phys., 1994, 187, 3, 381, https://doi.org/10.1016/0301-0104(94)89020-X . [all data]

Karolczak, Harper, et al., 1995
Karolczak, J.; Harper, W.W.; Grev, R.S.; Clouthier, D.J., The structure, spectroscopy, and excited state predissociation dynamics of GeH2, J. Chem. Phys., 1995, 103, 8, 2839, https://doi.org/10.1063/1.470520 . [all data]

Campargue and Escribano, 1999
Campargue, A.; Escribano, R., Room temperature absorption spectroscopy of GeH2 near 585 nm, Chem. Phys. Lett., 1999, 315, 5-6, 397, https://doi.org/10.1016/S0009-2614(99)01237-3 . [all data]

Smith, Clouthier, et al., 2000
Smith, T.C.; Clouthier, D.J.; Sha, W.; Adam, A.G., Laser optogalvanic and jet spectroscopy of germylene (GeH[sub 2]): New spectroscopic data for an important semiconductor growth intermediate, J. Chem. Phys., 2000, 113, 21, 9567, https://doi.org/10.1063/1.1319936 . [all data]

Wang, Andrews, et al., 2002
Wang, X.; Andrews, L.; Kushto, G.P., Infrared Spectra of the Novel Ge, J. Phys. Chem. A, 2002, 106, 24, 5809, https://doi.org/10.1021/jp020219v . [all data]

Wang and Andrews, 2003
Wang, X.; Andrews, L., Infrared Spectra of Group 14 Hydrides in Solid Hydrogen: Experimental Observation of PbH, J. Am. Chem. Soc., 2003, 125, 21, 6581, https://doi.org/10.1021/ja029862l . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Jacox, 2003
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

Smith and Guillory, 1972
Smith, G.R.; Guillory, W.A., Products of the Vacuum-Ultraviolet Photolysis of Germane Isolated in an Argon Matrix, J. Chem. Phys., 1972, 56, 4, 1423, https://doi.org/10.1063/1.1677383 . [all data]

Lloret, Oria, et al., 1991
Lloret, A.; Oria, M.; Seoudi, B.; Abouaf-Marguin, L., Infrared detection by the matrix-isolation technique of radicals produced in deposition plasmas: germane, Chem. Phys. Lett., 1991, 179, 4, 329, https://doi.org/10.1016/0009-2614(91)85161-O . [all data]

Notes

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Symbols used in this document:

EA Electron affinity

Δ_rH° Enthalpy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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EA	Electron affinity
Δ_rH°	Enthalpy of reaction at standard conditions