Germyl radical


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 by: José A. Martinho Simões

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Individual Reactions

Germane (g) = Hydrogen atom (g) + Germyl radical (g)

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

Quantity Value Units Method Reference Comment
Δr348.9 ± 8.4kJ/molPIMSBerkowitz, Ellison, et al., 1994Please also see Ruscic, Schwarz, et al., 1990. Value recommended in the critical survey Berkowitz, Ellison, et al., 1994.
Δr<358.kJ/molPIMSRuscic, Schwarz, et al., 1990Temperature: 0 K. A value of 343. ± 8. kJ/mol is recommended in Ruscic, Schwarz, et al., 1990.

Germyl radical (g) = Hydrogen atom (g) + Germylene (g)

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

Quantity Value Units Method Reference Comment
Δr>236.kJ/molPIMSRuscic, Schwarz, et al., 1990Temperature: 0 K. A value of 247. kJ/mol is recommended in Ruscic, Schwarz, et al., 1990.

Iodine atom (g) + Germane (g) = Hydrogen iodide (g) + Germyl radical (g)

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

Quantity Value Units Method Reference Comment
Δr47.0 ± 4.1kJ/molKinGNoble and Walsh, 1983 

Gas phase ion energetics 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:
LL - Sharon G. Lias and Joel F. Liebman
B - John E. Bartmess

View reactions leading to H3Ge+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
Δf(+) ion≤983.kJ/molN/AN/A 

Electron affinity determinations

EA (eV) Method Reference Comment
1.61 ± 0.12D-EADecouzon, Gal, et al., 1993The neutral acid ΔHf may be ca. 4 kcal/mol too positive: G2 calculations, Mayer, Gal, et al., 1997; B
<1.739 ± 0.043LPDReed and Brauman, 1974B
1.57668N/ACheck, Faust, et al., 2001Fe(CO)-(q); ; ΔS(EA)=5.0; B

Ionization energy determinations

IE (eV) Method Reference Comment
≤7.948 ± 0.005PIRuscic, Schwarz, et al., 1990LL

Vibrational and/or electronic energy levels

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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 by: Marilyn E. Jacox

State:   5p 2A2


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 47705 ± 5 gas Johnson, Tsai, et al., 1988


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

a2 2 OPLA 756 ± 5 gas MPI Johnson, Tsai, et al., 1988

State:   X


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

a1 2 Umbrella 663 ± 10 gas MPI Johnson, Tsai, et al., 1988
2 Umbrella 667.8 Ne IR Wang, Andrews, et al., 2002
2 Umbrella 667.0 Ar IR Wang, Andrews, et al., 2002
e 3 GeH3 stretch 2050 T gas DL Quandt and Hershberger, 1995
3 GeH3 stretch 2089.4 Ne IR Wang, Andrews, et al., 2002
3 GeH3 stretch 2074.1 Ar IR Wang, Andrews, et al., 2002
3 GeH3 stretch 2093.3 H2 IR Wang and Andrews, 2003
4 Deformation 857.2 Ne IR Wang, Andrews, et al., 2002
4 Deformation 852.4 Ar IR Wang, Andrews, et al., 2002
4 Deformation 853.5 H2 IR Wang and Andrews, 2003

Additional references: Jacox, 1994, page 128

Notes

TTentative assignment or approximate value
oEnergy separation between the v = 0 levels of the excited and electronic ground states.

References

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, Notes

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

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 GeHn(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]

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]

Johnson, Tsai, et al., 1988
Johnson, R.D., III; Tsai, B.P.; Hudgens, J.W., The electronic spectrum of the GeH3 radical, J. Chem. Phys., 1988, 89, 8, 4558, https://doi.org/10.1063/1.454796 . [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]

Quandt and Hershberger, 1995
Quandt, R.W.; Hershberger, J.F., Kinetics of GeH3 reactions with NO, NO2, and O2, Chem. Phys. Lett., 1995, 233, 5-6, 559, https://doi.org/10.1016/0009-2614(94)01510-3 . [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]


Notes

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