Borane, trimethyl-

• Formula: C₃H₉B
• Molecular weight: 55.915
• IUPAC Standard InChI: InChI=1S/C3H9B/c1-4(2)3/h1-3H3 Copy

  
• IUPAC Standard InChIKey: WXRGABKACDFXMG-UHFFFAOYSA-N Copy
• CAS Registry Number: 593-90-8
• Chemical structure:
  This structure is also available as a 2d Mol file
• Other names: Trimethylborane; Trimethylboron; (CH3)3B
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Phase change data
  • Gas phase ion energetics data
  • Mass spectrum (electron ionization)
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
  • Ion clustering data
  • IR Spectrum
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
• Options:
  • Switch to SI 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.

Phase change 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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Enthalpy of fusion

Gas phase ion energetics data

Go To: Top, Phase change 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 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

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

C₃H₈B^- +  =

By formula: C₃H₈B^- + H⁺ = C₃H₉B

Mass spectrum (electron ionization)

Go To: Top, 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: 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, Phase change 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.

Furukawa and Park, 1954
Furukawa, G.T.; Park, R.P., Heat Capacity, Heats of Fusion, Transition, and Vaporization, and Vapor Pressure of Trimethylborane B(CH3)3, Natl. Bur. Stand., 1954. [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]

Holliday, Reade, et al., 1971
Holliday, A.K.; Reade, W.; Johnstone, R.A.W.; Neville, A.F., Photo-electron spectrum of trivinylboron, Chem. Commun., 1971, 51. [all data]

Law and Margrave, 1956
Law, R.W.; Margrave, J.L., Mass spectrometer appearance potentials for positive ion fragments from BF₃, B(CH₃)₃, B(C₂H₅)₃, B(OCH₃)₃, and HB(OCH₃)₂, J. Chem. Phys., 1956, 25, 1086. [all data]

Berger, Kroner, et al., 1976
Berger, H.-O.; Kroner, J.; Noth, H., Die borhalogen-bindung in Methylhalogenboranen: Photoelektronenspektren und ab initio-Rechnungen, Chem. Ber., 1976, 109, 2266. [all data]

Barker, Lappert, et al., 1975
Barker, G.K.; Lappert, M.F.; Pedley, J.B.; Sharp, G.J.; Westwood, N.P.C., Bonding studies of boron and the group 3-5 elements. Part XV. He(I) photoelectron spectra of monomeric group 3 tri-halide, trimethyl, and mixed halogenomethyl species, J. Chem. Soc. Dalton Trans., 1975, 1765. [all data]

Fuss and Bock, 1974
Fuss, W.; Bock, H., Photoelectron spectra and molecular properties. XXXVI. (H₃C)₃B, (H₃C)₂BF, (H₃C)₂BN(CH₃)₂, and (H₃C)₂CC(CH₃)₂: The use of ionization potentials in assigning UV spectra, J. Chem. Phys., 1974, 61, 1613. [all data]

Murphy and Beauchamp, 1976
Murphy, M.K.; Beauchamp, J.L., Acid-base properties and gas-phase ion chemistry of (CH₃)₃B, J. Am. Chem. Soc., 1976, 98, 1433. [all data]

Notes

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

• Symbols used in this document:
  

  AE	Appearance energy
  Ttriple	Triple point temperature
  ΔfusH	Enthalpy of fusion
  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.