Phosphoric acid, trimethyl ester

• Formula: C₃H₉O₄P
• Molecular weight: 140.0749
• IUPAC Standard InChI: InChI=1S/C3H9O4P/c1-5-8(4,6-2)7-3/h1-3H3 Copy

  
• IUPAC Standard InChIKey: WVLBCYQITXONBZ-UHFFFAOYSA-N Copy
• CAS Registry Number: 512-56-1
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
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• Other names: Methyl phosphate; Trimethoxyphosphine oxide; Trimethyl orthophosphate; Trimethyl phosphate; (CH3O)3PO; Methyl phosphate, (MeO)3PO; NCI-C03781; TMP; Trimethylfosfat; O,O,O-Trimethyl phosphate; NSC 58985; TMPA; TMPO
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• Information on this page:
  • Phase change data
  • Gas phase ion energetics data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Gas Chromatography
  • References
  • Notes
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Phase change 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:
AC - William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

Antoine Equation Parameters

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

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

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

Ionization energy determinations

Appearance energy determinations

IR Spectrum

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Data compiled by: Coblentz Society, Inc.

• Not specified, most likely a prism, grating, or hybrid spectrometer.; (NO SPECTRUM, ONLY SCANNED IMAGE IS AVAILABLE)
• SOLUTION (SALTED IN CCl4 FOR 3800-1340, SALTED IN CS2 FOR 1340-400 CM^-1); DOW KBr FOREPRISM-GRATING; DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS); 4 cm^-1 resolution

Data compiled by: Tanya L. Myers, Russell G. Tonkyn, Ashley M. Oeck, Tyler O. Danby, John S. Loring, Matthew S. Taubman, Stephen W. Sharpe, Jerome C. Birnbaum, and Timothy J. Johnson

• liquid; Bruker Vertex 70 FTIR; 0.48217186 cm^-1 resolution

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

• gas; HP-GC/MS/IRD

Mass spectrum (electron ionization)

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

Spectrum

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Additional Data

Gas Chromatography

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

Normal alkane RI, non-polar column, temperature ramp

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Normal alkane RI, non-polar column, custom temperature program

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References

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

Panneerselvam, Antony, et al., 2007
Panneerselvam, K.; Antony, M.P.; Srinivasan, T.G.; Rao, P.R. Vasudeva, Measurement of enthalpies of vaporization of trialkyl phosphates using correlation gas chromatography, Thermochimica Acta, 2007, 466, 1-2, 49-56, https://doi.org/10.1016/j.tca.2007.10.007 . [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]

Stull, 1947
Stull, Daniel R., Vapor Pressure of Pure Substances. Organic and Inorganic Compounds, Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . [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]

Chattorpadhyay, Findley, et al., 1981
Chattorpadhyay, S.; Findley, G.L.; McGlynn, S.P., Photoelectron spectroscopy of phosphites and phosphates, J. Electron Spectrosc. Relat. Phenom., 1981, 24, 27. [all data]

Hodges, McDonnell, et al., 1980
Hodges, R.V.; McDonnell, T.J.; Beauchamp, J.L., Properties reactions of trimethyl phosphite, trimethyl phosphate, triethyl phosphate, and trimethyl phosphorothionate by ion cyclotron resonance spectroscopy, J. Am. Chem. Soc., 1980, 102, 1327. [all data]

Santoro, 1973
Santoro, E., The fragmentation of some alkyl thiophosphate esters by electron-impact, Org. Mass Spectrom., 1973, 7, 589. [all data]

Bafus, Gallegos, et al., 1966
Bafus, D.A.; Gallegos, E.J.; Kiser, R.W., An electron impact investigation of some alkyl phosphate esters, J. Phys. Chem., 1966, 70, 2614. [all data]

Cowley, Lattman, et al., 1977
Cowley, A.H.; Lattman, M.; Montag, R.A.; Verkade, J.G., The coordination behavior of acyclic phosphites; a UV photoelectron spectroscopic study, Inorg. Chim. Acta, 1977, 25, 151. [all data]

Vovna, Lopatin, et al., 1975
Vovna, V.I.; Lopatin, S.N.; Pettsol'd, R.; Vilesov, F.I., Photoelectron spectra and electronic structure of some phosphoryl compounds, Khim. Vys. Energ., 1975, 9, 9. [all data]

Peters, de Leer, et al., 1994
Peters, R.J.D.; de Leer, E.W.B.; Versteegh, J.F.M., Identification of Halogenated Compounds Produced by Chlorination of Humic Acid in the Presence of Bromide, J. Chromatogr. A, 1994, 686, 2, 253-261, https://doi.org/10.1016/0021-9673(94)00719-5 . [all data]

Spiteller and Spiteller, 1979
Spiteller, M.; Spiteller, G., Trennung und charakterisierung saurer harnbest and- teile, J. Chromatogr., 1979, 164, 3, 253-317, https://doi.org/10.1016/S0378-4347(00)81232-3 . [all data]

Tsunoda, 2005
Tsunoda, N., The sarin incidents in Japan and mass spectrometry, J. MAss Spectrom. Soc. Japan, 2005, 53, 3, 157-163, https://doi.org/10.5702/massspec.53.157 . [all data]

Soderstrom, White, et al., 2001
Soderstrom, M.; White, E.; Abis, L.; Sliwakowski, M., Summary report of the eight meeting of the validation group for the updating of the central OPCW analytical database, 28-29 November 2000, CS-2001-2242, Verification Division S/239/2001, 2001, 14. [all data]

Zenkevich, 1999
Zenkevich, I.G., Precalculation of Gas Chromatographic Retention Indices of Organic Compounds from Boiling Points of their Structural Analogues, Zh. Struct. Khim., 1999, 40, 1, 121-130. [all data]

Notes

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• Symbols used in this document:
  

  AE	Appearance energy
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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