Hydrazine, methyl-

• Formula: CH₆N₂
• Molecular weight: 46.0717
• IUPAC Standard InChI: InChI=1S/CH6N2/c1-3-2/h3H,2H2,1H3 Copy

  
• IUPAC Standard InChIKey: HDZGCSFEDULWCS-UHFFFAOYSA-N Copy
• CAS Registry Number: 60-34-4
• Chemical structure:
  This structure is also available as a 2d Mol file
• Other names: Methylhydrazine; Monomethylhydrazine; MMH; CH3NHNH2; Hydrazomethane; 1-Methylhydrazine; Metylohydrazyna; Rcra waste number P068; UN 1244
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Phase change data
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Mass spectrum (electron ionization)
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
• Options:
  • Switch to calorie-based units

Data at NIST subscription sites:

• NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change 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: Donald R. Burgess, Jr.

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change 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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Constant pressure heat capacity of liquid

Phase change data

Go To: Top, Gas phase thermochemistry data, Condensed 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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

Entropy of vaporization

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

View plot Requires a JavaScript / HTML 5 canvas capable browser.

Enthalpy of fusion

Entropy of fusion

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, 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:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LL - Sharon G. Lias and Joel F. Liebman

Ionization energy determinations

Appearance energy determinations

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, 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.

Cole and Gilbert, 1951
Cole, L.G.; Gilbert, E.C., The heats of combustion of some nitrogen compounds and the apparent energy of the N-N bond, J. Am. Chem. Soc., 1951, 73, 5423-5427. [all data]

Aston, Rock, et al., 1952
Aston, J.G.; Rock, E.J.; Isserow, S., The heats of combustion of the methyl substituted hydrazines and some observations on the burning of volatile liquids, J. Am. Chem. Soc., 1952, 74, 2484-24. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Aston, Fink, et al., 1951
Aston, J.G.; Fink, H.L.; Janz, G.J.; Russell, K.E., The heat capacity, heats of fusion and vaporization, vapor pressures, entropy and thermodynamic functions of methyl hydrazine, J. Am. Chem. Soc., 1951, 73, 1939-1943. [all data]

Majer and Svoboda, 1985
Majer, V.; Svoboda, V., Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]

Aston, Finke, et al., 1951
Aston, J.G.; Finke, H.L.; Janz, G.J.; Russell, K.E., The Heat Capacity, Heats of Fusion and Vaporization, Vapor Pressures, Entropy and Thermodynamic Functions of Methylhydrazine, J. Am. Chem. Soc., 1951, 73, 1939. [all data]

Aston, Fink, et al., 1951, 2
Aston, J.G.; Fink, H.L.; Janz, G.J.; Russell, K.E., The heat capacity, heats of fusion and vaporization, vapor pressures, entropy and thermodynamic functions of methylhydrazine, J. Am. Chem. Soc., 1951, 73, 1939-19. [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [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]

Mautner(Meot-Ner), Nelsen, et al., 1984
Mautner(Meot-Ner), M.; Nelsen, S.F.; Willi, M.R.; Frigo, T.B., Special effects of an unusually large neutral to radical cation geometry change. Adiabatic ionization energies and proton affinities of alkylhydrazines, J. Am. Chem. Soc., 1984, 106, 7384. [all data]

Bodor, Dewar, et al., 1970
Bodor, N.; Dewar, M.J.S.; Jennings, W.B.; Worley, S.D., Photoelectron spectra of molecules-IV.Ionization potentials and heats of formation of some hydrazines and amines, Tetrahedron, 1970, 26, 4109. [all data]

Akopyan and Vilesov, 1963
Akopyan, M.E.; Vilesov, F.I., Decay of the molecular ions formed in photoionization of hydrazine and some of its alkyl derivatives, Kinetika i Kataliz, 1963, 4, 39, In original 32. [all data]

Akopyan, Vilesov, et al., 1963
Akopyan, M.E.; Vilesov, F.I.; Terenin, A.N., Mass spectrometric investigation of photoionization of molecules and dissociation of excited molecular ions, Izv. Akad. Nauk SSSR, Ser. Fiz., 1963, 27, 1083, In original 1054. [all data]

Dibeler, Franklin, et al., 1959
Dibeler, V.H.; Franklin, J.L.; Reese, R.M., Electron impact studies of hydrazine and the methyl-substituted hydrazines, J. Am. Chem. Soc., 1959, 81, 68. [all data]

Vovna, Vilesov, et al., 1975
Vovna, V.I.; Vilesov, F.I.; Lopatin, S.N., Photoelectron spectra of hydrazine and some alkyl derivatives, Opt. Spectrosc., 1975, 38, 143. [all data]

Rademacher, 1975
Rademacher, P., Acyclische Hydrazine, Chem. Ber., 1975, 108, 1548. [all data]

Kimura, Katsumata, et al., 1975
Kimura, K.; Katsumata, S.; Osafune, K., Photoelectron spectroscopic study of skew compounds. Methylhydrazine and unsymmetrical dimethylhydrazine, Bull. Chem. Soc. Jpn., 1975, 48, 2736. [all data]

Nelsen and Buschek, 1974
Nelsen, S.F.; Buschek, J.M., Photoelectron spectra of hydrazines. III. Evidence for similar lone pair-lone pair dihedral angles for acyclic hydrazines, J. Am. Chem. Soc., 1974, 96, 2392. [all data]

Foner and Hudson, 1970
Foner, S.N.; Hudson, R.L., Mass spectrometric studies of atom-molecule reactions using high-intensity crossed molecular beams, J. Chem. Phys., 1970, 53, 4377. [all data]

Burgers, Drewello, et al., 1989
Burgers, P.C.; Drewello, T.; Schwarz, H.; Terlouw, J.K., CH₅N₂ hydrazyl radicals, cations and dication radicals studied by mass spectrometry. Is the N-protonated formaldehyde hydrazon cation ⁺CH₂-NH-NH₂ a bridged species?, Int. J. Mass Spectrom. Ion Processes, 1989, 95, 157. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, References

• Symbols used in this document:
  

  AE	Appearance energy
  Cp,liquid	Constant pressure heat capacity of liquid
  IE (evaluated)	Recommended ionization energy
  S°liquid	Entropy of liquid at standard conditions
  Tboil	Boiling point
  Ttriple	Triple point temperature
  ΔcH°liquid	Enthalpy of combustion of liquid at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔfusH	Enthalpy of fusion
  ΔfusS	Entropy of fusion
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions
  ΔvapS	Entropy of vaporization

• 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.