Boric acid, trimethyl ester

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Reaction thermochemistry 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:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

Fluorine anion + Boric acid, trimethyl ester = (Fluorine anion • Boric acid, trimethyl ester)

By formula: F- + C3H9BO3 = (F- • C3H9BO3)

Quantity Value Units Method Reference Comment
Δr176. ± 17.kJ/molIMRBLarson and McMahon, 1985gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B,M
Quantity Value Units Method Reference Comment
Δr142. ± 13.kJ/molIMRBLarson and McMahon, 1985gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable.; B

CN- + Boric acid, trimethyl ester = (CN- • Boric acid, trimethyl ester)

By formula: CN- + C3H9BO3 = (CN- • C3H9BO3)

Quantity Value Units Method Reference Comment
Δr82.0 ± 4.2kJ/molIMRELarson, Szulejko, et al., 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr150.J/mol*KN/ALarson, Szulejko, et al., 1988gas phase; switching reaction,Thermochemical ladder(CN-)H2O, Entropy change calculated or estimated; Payzant, Yamdagni, et al., 1971; M
Quantity Value Units Method Reference Comment
Δr44.8 ± 2.1kJ/molIMRELarson, Szulejko, et al., 1988gas phase; B,M

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

Quantity Value Units Method Reference Comment
Proton affinity (review)815.8kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity783.4kJ/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
10.0PEKroner, Nolle, et al., 1973LLK
10.62EILappert, Litzow, et al., 1970RDSH
10.8 ± 0.3EIWada and Kiser, 1964RDSH
8.9 ± 0.2EILaw and Margrave, 1956RDSH
10.40PEKroner, Nolle, et al., 1973Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
B+31.6 ± 1.0?EILaw and Margrave, 1956RDSH
BO2+17.5 ± 0.3?EIWada and Kiser, 1964RDSH
BO3+13.2 ± 0.3?EIWada and Kiser, 1964RDSH
BO3+12.7 ± 1.0?EILaw and Margrave, 1956RDSH
CHO+19.1 ± 0.3?EIWada and Kiser, 1964RDSH
CH3+13.6 ± 0.5?EILaw and Margrave, 1956RDSH
CH3O+12.7 ± 0.2?EIWada and Kiser, 1964RDSH
C2H5BO2+13.2 ± 0.2?EIWada and Kiser, 1964RDSH
C2H6BO+16.6 ± 0.3?EIWada and Kiser, 1964RDSH
C2H6BO2+13.0 ± 0.2CH3OEIWada and Kiser, 1964RDSH
C2H6BO2+9.6 ± 0.2CH3OEILaw and Margrave, 1956RDSH
C2H6BO3+12.1 ± 0.2CH3EIWada and Kiser, 1964RDSH

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

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Owner NIST Mass Spectrometry Data Center
Collection (C) 2014 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin R.W. KISER KANSAS STATE UNIV., MANHATTAN, KANSAS, USA
NIST MS number 1326

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References

Go To: Top, Reaction 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.

Larson and McMahon, 1985
Larson, J.W.; McMahon, T.B., Fluoride and chloride affinities of the main group oxides, fluorides, oxofluorides, and alkyls. Quantitative scales of lewis acidities from ICR halide exchange equilibria, J. Am. Chem. Soc., 1985, 107, 766. [all data]

Wenthold and Squires, 1995
Wenthold, P.G.; Squires, R.R., Bond dissociation energies of F2(-) and HF2(-). A gas-phase experimental and G2 theoretical study, J. Phys. Chem., 1995, 99, 7, 2002, https://doi.org/10.1021/j100007a034 . [all data]

Larson, Szulejko, et al., 1988
Larson, J.W.; Szulejko, J.E.; McMahon, T.B., Gas Phase Lewis Acid-Base Interactions. An Experimental Determination of Cyanide Binding Energies From Ion Cyclotron Resonance and High-Pressure Mass Spectrometric Equilibrium Measurements., J. Am. Chem. Soc., 1988, 110, 23, 7604, https://doi.org/10.1021/ja00231a004 . [all data]

Payzant, Yamdagni, et al., 1971
Payzant, J.D.; Yamdagni, R.; Kebarle, P., Hydration of CN-, NO2-, NO3-, and HO- in the gas phase, Can. J. Chem., 1971, 49, 3308. [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]

Kroner, Nolle, et al., 1973
Kroner, J.; Nolle, D.; Noth, H., Photoelektronenspektroskopische untersuchungen an bor-verbindungen, I Orbitalreihenfolgen und ladungsdichten in methylthiound methoxyborane, Z. Naturforsch. B:, 1973, 28, 416. [all data]

Lappert, Litzow, et al., 1970
Lappert, M.F.; Litzow, M.R.; Pedley, J.B.; Riley, P.N.K.; Spalding, T.R.; Tweedale, A., Bonding studies of compounds of boron and the group IV elements. Part III.First ionisation potentials of some simple boron compounds by electron impact and by a new empirical molecular orbital method, J. Chem. Soc. A, 1970, 2320. [all data]

Wada and Kiser, 1964
Wada, Y.; Kiser, R.W., A mass spectrometric study of trimethyl borate, J. Phys. Chem., 1964, 68, 1588. [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]


Notes

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