Germanium difluoride

Formula: F₂Ge
Molecular weight: 110.64
IUPAC Standard InChI: InChI=1S/F2Ge/c1-3-2
IUPAC Standard InChIKey: GGJOARIBACGTDV-UHFFFAOYSA-N
CAS Registry Number: 13940-63-1
Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
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Other data available:
- Gas phase ion energetics data
Data at other public NIST sites:
- Microwave spectra (on physics lab web site)
- X-ray Photoelectron Spectroscopy Database, version 5.0
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Phase change data

Go To: Top, Vibrational and/or electronic energy levels, References, Notes

Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Quantity	Value	Units	Method	Reference	Comment
T_fus	385.	K	N/A	Adams, Margrave, et al., 1971	Uncertainty assigned by TRC = 1.5 K; TRC
T_fus	385.	K	N/A	Adams, Margrave, et al., 1970	Uncertainty assigned by TRC = 3. K; TRC
Quantity	Value	Units	Method	Reference	Comment
Δ_subH°	82.8 ± 4.2	kJ/mol	MS	Adams, Margrave, et al., 1971	AC
Δ_subH°	93. ± 11.	kJ/mol	N/A	Adams, Margrave, et al., 1971	AC

Enthalpy of fusion

Δ_fusH (kJ/mol)	Temperature (K)	Reference	Comment
9.25	(corrected to 298.K)	Adams, Margrave, et al., 1971	AC

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

Vibrational and/or electronic energy levels

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Data compiled by: Marilyn E. Jacox

State: B ?

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


T_x = 68400	T	gas	B-X	136	156	Gole, Hauge, et al., 1972

State: A

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


T_o = 43860.9	gas	A-X	215	265	Hauge, Khanna, et al., 1968
					Karolczak, Grev, et al., 1994
					Boyle, Seccombe, et al., 1998

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


a₁	1	Sym. stretch	623.8 ± 0.6	gas	LF	Karolczak, Grev, et al., 1994
	2	Bend	159.6	gas	AB LF	Hauge, Khanna, et al., 1968 Karolczak, Grev, et al., 1994

State: a

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


T_o = 30582.1	gas	a-X	300	380	Martin and Merer, 1973
					Yagi and Takahashi, 1992
					Yagi, Ohta, et al., 1993
					Karolczak, Grev, et al., 1994
					Boyle, Seccombe, et al., 1998

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


a₁	1	Sym. stretch	673.1 ± 0.5	gas	LF	Karolczak, Grev, et al., 1994
	2	Bend	192.2	gas	EM LF	Martin and Merer, 1973 Yagi and Takahashi, 1992 Karolczak, Grev, et al., 1994

State: X

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


a₁	1	Sym. stretch	663	gas	IR	Hastie, Hauge, et al., 1968
	1	Sym. stretch	655	Ne	IR	Hastie, Hauge, et al., 1968
	1	Sym. stretch	648	Ar	IR Ra	Hastie, Hauge, et al., 1968 Huber, Kundig, et al., 1974
	1	Sym. stretch	653	N₂	Ra	Huber, Kundig, et al., 1974
	2	Bend	263 ± 2	gas	AB EM	Hauge, Khanna, et al., 1968 Martin and Merer, 1973 Yagi and Takahashi, 1992
b₂	3	Asym. stretch	692	gas	IR	Hastie, Hauge, et al., 1968
	3	Asym. stretch	685	Ne	IR	Hastie, Hauge, et al., 1968
	3	Asym. stretch	676	Ar	IR	Hastie, Hauge, et al., 1968

Additional references: Jacox, 1994, page 101; Jacox, 1998, page 198; Jacox, 2003, page 140; Takeo, Curl, et al., 1971; Takeo and Curl, 1972

Notes

Tentative assignment or approximate value

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

Energy separation between the band maximum of the excited electronic state and the v = 0 level of the ground state.

References

Go To: Top, Phase change data, Vibrational and/or electronic energy levels, Notes

Adams, Margrave, et al., 1971
Adams, G.P.; Margrave, J.L.; Steiger, Ronald P.; Wilson, P.W., The enthalpy of sublimation of germanium difluoride and the thermodynamics of sublimation of the Group IVa difluorides, The Journal of Chemical Thermodynamics, 1971, 3, 3, 297-305, https://doi.org/10.1016/S0021-9614(71)80046-0 . [all data]

Adams, Margrave, et al., 1970
Adams, G.P.; Margrave, J.L.; Wilson, P.W., The Enthalpy of Formation of Germanium Difluoride, J. Chem. Thermodyn., 1970, 2, 741-4. [all data]

Gole, Hauge, et al., 1972
Gole, J.L.; Hauge, R.H.; Margrave, J.L.; Hastie, J.W., The vaccum ultraviolet spectra of SiF2 and GeF2, J. Mol. Spectrosc., 1972, 43, 3, 441, https://doi.org/10.1016/0022-2852(72)90055-0 . [all data]

Hauge, Khanna, et al., 1968
Hauge, R.; Khanna, V.M.; Margrave, L., Ultraviolet absorption spectrum of GeF2, J. Mol. Spectrosc., 1968, 27, 1-4, 143, https://doi.org/10.1016/0022-2852(68)90026-X . [all data]

Karolczak, Grev, et al., 1994
Karolczak, J.; Grev, R.S.; Clouthier, D.J., Pyrolysis jet spectroscopy and ab initio studies of the S1 and T1 states of germanium difluoride, J. Chem. Phys., 1994, 101, 2, 891, https://doi.org/10.1063/1.467742 . [all data]

Boyle, Seccombe, et al., 1998
Boyle, K.J.; Seccombe, D.P.; Tuckett, R.P.; Baumgartel, H.; Jochims, H.W., Vacuum--UV fluorescence spectroscopy of GeF4 in the 10--25 eV range, Chem. Phys. Lett., 1998, 294, 6, 507, https://doi.org/10.1016/S0009-2614(98)00881-1 . [all data]

Martin and Merer, 1973
Martin, R.W.; Merer, A.J., A New Electronic Emission System of GeF, Can. J. Phys., 1973, 51, 7, 727, https://doi.org/10.1139/p73-097 . [all data]

Yagi and Takahashi, 1992
Yagi, S.; Takahashi, N., Anomalous intense ultraviolet emission bands in the radio-frequency glow discharges of GeH4-fluorocarbon-H2 mixtures, Appl. Phys. Lett., 1992, 61, 22, 2677, https://doi.org/10.1063/1.108106 . [all data]

Yagi, Ohta, et al., 1993
Yagi, S.; Ohta, T.; Saito, K.; Obi, K., Selective excitation of GeF and GeF2 in glow discharges of GeF4, J. Appl. Phys., 1993, 74, 3, 1480, https://doi.org/10.1063/1.354846 . [all data]

Hastie, Hauge, et al., 1968
Hastie, J.W.; Hauge, R.; Margrave, J.L., Infrared vibrational properties of germanium difluoride, J. Phys. Chem., 1968, 72, 13, 4492, https://doi.org/10.1021/j100859a020 . [all data]

Huber, Kundig, et al., 1974
Huber, H.; Kundig, E.P.; Ozin, G.A.; Vander Voet, A., Matrix Infrared and Laser Raman Spectra, Molecular Structures and Normal Coordinate Analyses of Germanium Difluoride, Monomer GeF, Can. J. Chem., 1974, 52, 1, 95, https://doi.org/10.1139/v74-013 . [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]

Takeo, Curl, et al., 1971
Takeo, H.; Curl, R.F.; Wilson, P.W., Microwave spectrum of GeF2, J. Mol. Spectrosc., 1971, 38, 3, 464, https://doi.org/10.1016/0022-2852(71)90072-5 . [all data]

Takeo and Curl, 1972
Takeo, H.; Curl, R.F., Microwave spectrum of GeF2: quadrupole coupling and centrifugal distortion, J. Mol. Spectrosc., 1972, 43, 1, 21, https://doi.org/10.1016/0022-2852(72)90160-9 . [all data]

Notes

Go To: Top, Phase change data, Vibrational and/or electronic energy levels, References

Symbols used in this document:

T_fus Fusion (melting) point

Δ_fusH Enthalpy of fusion

Δ_subH° Enthalpy of sublimation at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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T_fus	Fusion (melting) point
Δ_fusH	Enthalpy of fusion
Δ_subH°	Enthalpy of sublimation at standard conditions