Methane, diazo-

• Formula: CH₂N₂
• Molecular weight: 42.0400
• IUPAC Standard InChI: InChI=1S/CH2N2/c1-3-2/h1H2 Copy

  
• IUPAC Standard InChIKey: YXHKONLOYHBTNS-UHFFFAOYSA-N Copy
• CAS Registry Number: 334-88-3
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Other names: Azimethylene; Diazomethane; Acomethylene; Diazirine; Diazonium methylide
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Gas phase ion energetics data
  • Mass spectrum (electron ionization)
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
  • UV/Visible spectrum
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
• Options:
  • Switch to SI units

Gas phase thermochemistry data

Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), References, Notes

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

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Mass spectrum (electron ionization), References, Notes

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:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to CH₂N₂⁺ (ion structure unspecified)

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

CHN₂^- +  =

By formula: CHN₂^- + H⁺ = CH₂N₂

Mass spectrum (electron ionization)

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

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

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

Notice: This spectrum may be better viewed with a Javascript and HTML 5 enabled browser.

For Zoom

1.) Enter the desired X axis range (e.g., 100, 200)

2.) Check here for automatic Y scaling

3.) Press here to zoom

Additional Data

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), Notes

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

Laufer and Okabe, 1971
Laufer, A.H.; Okabe, H., Heat of formation and bond dissociation energy of diazomethane by a photodissociation method, J. Am. Chem. Soc., 1971, 93, 4137-7140. [all data]

Paulett and Ettinger, 1963
Paulett, G.S.; Ettinger, R., Mass spectra and appearance potentials of diazirine and diazomethane, J. Chem. Phys., 1963, 39, 825-827. [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Bastide and Maier, 1976
Bastide, J.; Maier, J.P., Electronic states of the radical cations of the 1,3-dipoles: HCNO, CH₂N₂, and N₃H, studied by photoelectron spectroscopy, Chem. Phys., 1976, 12, 177. [all data]

Merer, 1964
Merer, A.J., The vacuum ultraviolet absorption spectrum of diazomethane, Can. J. Phys., 1964, 42, 1242. [all data]

Paulett and Ettinger, 1963, 2
Paulett, G.S.; Ettinger, R., Mass spectra and appearance potentials of diazirine and diazomethane, J. Chem. Phys., 1963, 39, 825. [all data]

Berkowitz and Wexler, 1962
Berkowitz, J.; Wexler, S., On the ionization potential of the CH₂ radical, J. Chem. Phys., 1962, 37, 1476. [all data]

Clifford, Wenthold, et al., 1998
Clifford, E.P.; Wenthold, P.G.; Lineberger, W.C.; Peterssom, G.A.; Broaddus, K.M.; Kass, S.R.; Kato, S., Properties of Diazocarbene [CNN] and the diazomethyl Radical [HCNN] via Ion Chemistry and Spectroscopy, J. Phys. Chem. A, 1998, 102, 36, 7100, https://doi.org/10.1021/jp9802735 . [all data]

Laufer and Okabe, 1972
Laufer, A.H.; Okabe, H., J. Phys. Chem., 1972, 76, 3504. [all data]

Dixon, de Jong, et al., 2005
Dixon, D.A.; de Jong, W.A.; Peterson, K.A.; McMahon, T.B., Methyl cation affinities of rare gases and nitrogen and the heat of formation of diazomethane, J. Phys. Chem. A, 2005, 109, 18, 4073-4080, https://doi.org/10.1021/jp044561e . [all data]

DePuy, Van Doren, et al., 1989
DePuy, C.H.; Van Doren, J.M.; Gronert, S.; Kass, S.R.; Motell, E.L.; Ellison, G.B.; Bierbaum, V.M., Gas-Phase Negative-Ion Chemistry of Diazomethane, J. Org. Chem., 1989, 54, 8, 1846, https://doi.org/10.1021/jo00269a020 . [all data]

Gordon and Kass, 1997
Gordon, M.S.; Kass, S.R., CHN2-: A biradical anion and a potentially new type of reactive intermediate (vol 99, pg 6548, 1995), J. Phys. Chem. A, 1997, 101, 42, 7922-7922, https://doi.org/10.1021/jp972321b . [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), References

• Symbols used in this document:
  

  AE	Appearance energy
  IE (evaluated)	Recommended ionization energy
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
• The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
• Customer support for NIST Standard Reference Data products.