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Methoxy radical

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 evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard

View reactions leading to CH3O+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)10.72eVN/AN/AL
Quantity Value Units Method Reference Comment
DeltafH(+) ion,0K253.1kcal/molN/AN/A 

Ionization energy determinations

IE (eV) Method Reference Comment
10.72DERRuscic and Berkowitz, 1991LL
8.6DERLias, Bartmess, et al., 1988LL
8.3 ± 0.3CIELGriffiths and Harris, 1987LBLHLM
7.37 ± 0.03PEDyke, 1987LBLHLM

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
CHO+8.73H2PIKuo, Zhang, et al., 1994LL

Anion protonation reactions

CH3O- + Hydrogen cation = Methyl Alcohol

By formula: CH3O- + H+ = CH4O

Quantity Value Units Method Reference Comment
Deltar382. ± 2.kcal/molAVGN/AAverage of 6 values; Individual data points
Quantity Value Units Method Reference Comment
Deltar376.02 ± 0.62kcal/molH-TSNee, Osterwalder, et al., 2006gas phase; B
Deltar376.04 ± 0.55kcal/molH-TSOsborn, Leahy, et al., 1998gas phase; B
Deltar374.0 ± 2.0kcal/molIMREBartmess, Scott, et al., 1979gas phase; The acidity is 1.2 kcal/mol stronger than that from the D-EA cycle, due to the multi-compound fit for the acidity scale.; value altered from reference due to change in acidity scale; B
Deltar374.6 ± 2.1kcal/molH-TSHaas and Harrison, 1993gas phase; Both metastable and 50 eV collision energy.; B
Deltar375.10 ± 0.60kcal/molTDEqMeot-ner and Sieck, 1986gas phase; Experimental entropy: 21.5 eu, 0.6 less than H2O; B


Go To: Top, Gas phase ion energetics data, Notes

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

Ruscic and Berkowitz, 1991
Ruscic, B.; Berkowitz, J., Photoionization mass spectrometric studies of the isomeric transient species CD2OH and CD3O, J. Chem. Phys., 1991, 95, 4033. [all data]

Lias, Bartmess, et al., 1988
Lias, S.G.; Bartmess, J.E.; Liebman, J.F.; Holmes, J.L.; Levin, R.D.; Mallard, W.G., Gas-phase ion and neutral thermochemistry, J. Phys. Chem. Ref. Data, Suppl. 1, 1988, 17, 1-861. [all data]

Griffiths and Harris, 1987
Griffiths, W.J.; Harris, F.M., Ionization energies of CH3O and CH3S radicals measured by charge-inversion energy-loss spectrometry, Chem. Phys. Lett., 1987, 142, 7. [all data]

Dyke, 1987
Dyke, J.M., Properties of gas-phase ions, J. Chem. Soc. Faraday Trans., 1987, 83, 69. [all data]

Kuo, Zhang, et al., 1994
Kuo, S.-C.; Zhang, Z.; Klemm, R.B.; Liebman, J.F.; Stief, L.J.; Nesbitt, F.L., Photoionization of hydroxymethyl (CD2OH and CD3O) radicals: Photoion efficiency spectra, ionization energies and thermochemistry, J. Phys. Chem., 1994, 98, 4026. [all data]

Nee, Osterwalder, et al., 2006
Nee, M.J.; Osterwalder, A.; Zhou, J.; Neumark, D.M., Slow electron velocity-map imaging photoelectron spectra of the methoxide anion, J. Chem. Phys., 2006, 125, 1, 014306, https://doi.org/10.1063/1.2212411 . [all data]

Osborn, Leahy, et al., 1998
Osborn, D.L.; Leahy, D.J.; Kim, E.H.; deBeer, E.; Neumark, D.M., Photoelectron spectroscopy of CH3O- and CD3O-, Chem. Phys. Lett., 1998, 292, 4-6, 651-655, https://doi.org/10.1016/S0009-2614(98)00717-9 . [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [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]

Meot-ner and Sieck, 1986
Meot-ner, M.; Sieck, L.W., Relative acidities of water and methanol, and the stabilities of the dimer adducts, J. Phys. Chem., 1986, 90, 6687. [all data]


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