3,4,5-Trimethylbenzoic acid

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Condensed phase 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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Δfsolid-119.7 ± 0.43kcal/molCmColomina, Jimenez, et al., 1987see Colomina, Turrion, et al., 1964
Quantity Value Units Method Reference Comment
Δcsolid-1230.7 ± 0.22kcal/molCmColomina, Jimenez, et al., 1987see Colomina, Turrion, et al., 1964; Corresponding Δfsolid = -119.7 kcal/mol (simple calculation by NIST; no Washburn corrections)

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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
AC - William E. Acree, Jr., James S. Chickos

Quantity Value Units Method Reference Comment
Δsub26.5 ± 0.1kcal/molVColomina, Jimenez, et al., 1987see Colomina, Turrion, et al., 1964; ALS
Δsub26.53kcal/molN/AColomina, Jimenez, et al., 1987DRB
Δsub26.5 ± 0.1kcal/molMEColomina, Jimenez, et al., 1987Based on data from 340. to 359. K.; AC

Enthalpy of sublimation

ΔsubH (kcal/mol) Temperature (K) Method Reference Comment
26.1 ± 0.1350.MEColomina, Jimenez, et al., 1987Based on data from 340. to 359. K.; AC

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 compiled by: John E. Bartmess

De-protonation reactions

C10H11O2- + Hydrogen cation = 3,4,5-Trimethylbenzoic acid

By formula: C10H11O2- + H+ = C10H12O2

Quantity Value Units Method Reference Comment
Δr341.3 ± 2.2kcal/molG+TSDecouzon, Exner, et al., 1996gas phase
Quantity Value Units Method Reference Comment
Δr334.2 ± 2.0kcal/molIMREDecouzon, Exner, et al., 1996gas phase

References

Go To: Top, 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.

Colomina, Jimenez, et al., 1987
Colomina, M.; Jimenez, P.; Roux, M.V.; Turrion, C., Thermochemical properties of benzoic acid derivatives. XV. Vapour pressures and enthalpies of sublimation and formation of the six trimethylbenzoic acids, J. Chem. Thermodyn., 1987, 19, 1139-1144. [all data]

Colomina, Turrion, et al., 1964
Colomina, M.; Turrion, C.; Boned, M.L.; Panea, M., Investigaciones termoquimicas sobre los acidos alquilbenzoicos. III. Acidos trimetilbenzoicos, Anal. Fisc. Quim. B, 1964, 60, 619-626. [all data]

Decouzon, Exner, et al., 1996
Decouzon, M.; Exner, O.; Gal, J.-F.; Maria, P.-C., Non-classical Buttressing Effect: Gas-phase Ionization of Some Methyl Substituted Benzoic Acids, J. Chem. Soc. Perkin Trans., 1996, 2, 4, 475, https://doi.org/10.1039/p29960000475 . [all data]


Notes

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