Trifluoromethyl radical

Data at NIST subscription sites:

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, 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

Quantity Value Units Method Reference Comment
Δfgas-470.28kJ/molReviewChase, 1998Data last reviewed in June, 1969
Δfgas-429. ± 13.kJ/molEqkEhlert, 1969ALS
Quantity Value Units Method Reference Comment
gas,1 bar265.08J/mol*KReviewChase, 1998Data last reviewed in June, 1969

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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

View table.

Temperature (K) 298. to 1000.1000. to 6000.
A 14.3932181.77879
B 156.58160.788132
C -140.5623-0.163525
D 45.976300.011545
E -0.000616-6.076340
F -480.3860-511.2597
G 241.6498339.5266
H -470.2816-470.2816
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in June, 1969 Data last reviewed in June, 1969

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry 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:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
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

View reactions leading to CF3+ (ion structure unspecified)

Electron affinity determinations

EA (eV) Method Reference Comment
1.820 ± 0.050LPESDeyerl, Alconcel, et al., 2001Adiabatic EA, from vibrational structure of spectrum; B
1.90 ± 0.30NBAEDispert and Lacmann, 1978From CF4; B
2.820 ± 0.010PDRichardson, Stephenson, et al., 1975Stated electron affinity is the Vertical Detachment Energy; B
1.87003EIAEWang, Margrave, et al., 1973From CF4; B
1.80 ± 0.20EIAEThynne and MacNeil, 1970From CF3OF; B
2.00008EIAELifshitz and Grajower, 1969From C3F8. G3MP2B3 calculations indicate an EA of ca. 2.0 eV.; B
2.80 ± 0.20N/ASpyrou, Sauers, et al., 1983From CF4, relative to F- appearance energy; B
2.19999EIAEFranklin, Wang, et al., 1974From CF4; B
2.20 ± 0.30EIAEHarland and Franklin, 1974From CF4; B
>2.40 ± 0.50EIAEHarland and Franklin, 1974From C2F6; B
>2.05 ± 0.20EIAEHarland and Franklin, 1974From C3F8.; B
3.15 ± 0.20EIAELifshitz and Grajower, 1972From CF4; B
2.50211EIAEHarland and Thynne, 1970From (CF3)2CO; B
2.70 ± 0.20EIAEMacNeil and Thynne, 1970From CF4; B
2.10 ± 0.30EIAEThynne and MacNeil, 1970, 2From C2F4; B
<2.60185EIAEMacNeil and Thynne, 1969From C2F6; B
3.24997EIAEBibby and Carter, 1963From C2F6; B
1.97 ± 0.23SIPage and Goode, 1969The Magnetron method, lacking mass analysis, is not considered reliable.; B

Ionization energy determinations

IE (eV) Method Reference Comment
8.76IMBTsuji, Aizawa, et al., 1995LL
10.6EIGoto, Nakamura, et al., 1994LL
8.5 ± 0.8EITarnovsky and Becker, 1993LL
8.60 ± 0.07ENDFischer and Armentrout, 1990LL
9.3 ± 0.2EIKime, Driscoll, et al., 1987LBLHLM
8.9DERLoguinov, Takhistov, et al., 1981LLK
9.14DERBerman, Beauchamp, et al., 1981LLK
9.17PEAue and Bowers, 1979LLK
9.5DERSyrvatka, Gil'burd, et al., 1973LLK
9.11DERWalter, Lifshitz, et al., 1969RDSH
9.8 ± 0.2EIEhlert, 1969, 2RDSH
9.25 ± 0.04PILifshitz and Chupka, 1967RDSH

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
CF+22.22FEIGoto, Nakamura, et al., 1994LL
CF+21.4F2EIGoto, Nakamura, et al., 1994LL
CF+21.4 ± 0.42FEITarnovsky, Kurunczi, et al., 1993LL
CF2+18.9FEIGoto, Nakamura, et al., 1994LL
CF2+17.1 ± 0.4FEITarnovsky, Kurunczi, et al., 1993LL

Anion protonation reactions

CF3- + Hydrogen cation = Fluoroform

By formula: CF3- + H+ = CHF3

Quantity Value Units Method Reference Comment
Δr1582. ± 5.9kJ/molD-EADeyerl, Alconcel, et al., 2001gas phase; Adiabatic EA, from vibrational structure of spectrum; B
Δr1577. ± 8.8kJ/molG+TSBartmess, Scott, et al., 1979gas phase; Paulino and Squires, 1991 suggests that this acidity may be too weak by ca. 5 kcal/mol. However, G2 calcn(JEB) give ΔHacid=379.9, ΔGacid=372.0; value altered from reference due to change in acidity scale; B
Δr1573. ± 19.kJ/molCIDTGraul and Squires, 1990gas phase; B
Quantity Value Units Method Reference Comment
Δr1549. ± 6.3kJ/molH-TSDeyerl, Alconcel, et al., 2001gas phase; Adiabatic EA, from vibrational structure of spectrum; B
Δr1545. ± 8.4kJ/molIMREBartmess, Scott, et al., 1979gas phase; Paulino and Squires, 1991 suggests that this acidity may be too weak by ca. 5 kcal/mol. However, G2 calcn(JEB) give ΔHacid=379.9, ΔGacid=372.0; value altered from reference due to change in acidity scale; B

References

Go To: Top, Gas phase thermochemistry 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Ehlert, 1969
Ehlert, T.C., Bonding in C1 and C2 fluroides, J. Phys. Chem., 1969, 73, 949-953. [all data]

Deyerl, Alconcel, et al., 2001
Deyerl, H.J.; Alconcel, L.S.; Continetti, R.E., Photodetachment imaging studies of the electron affinity of CF3, J. Phys. Chem. A, 2001, 105, 3, 552-557, https://doi.org/10.1021/jp003137k . [all data]

Dispert and Lacmann, 1978
Dispert, H.; Lacmann, K., Negative ion formation in collisions between potassium and fluoro- and chloromethanes: Electron affinities and bond dissociation energies, Int. J. Mass Spectrom. Ion Phys., 1978, 28, 49. [all data]

Richardson, Stephenson, et al., 1975
Richardson, J.H.; Stephenson, L.M.; Brauman, J.I., Photodetachment of electrons from trifluoromethyl and trifluorosilyl ions the electron affinities of CF3 and SiF3, Chem. Phys. Lett., 1975, 30, 17. [all data]

Wang, Margrave, et al., 1973
Wang, J.L.-F.; Margrave, J.L.; Franklin, J.L., Interpretation of dissociative electron attachment processes for carbon and silicon tetrafluorides, J. Chem. Phys., 1973, 58, 5417. [all data]

Thynne and MacNeil, 1970
Thynne, J.C.J.; MacNeil, K.A.G., Ionisation and dissociation of carbonyl fluoride and trifluoromethyl hypofluorite by electron impact, Intern. J. Mass Spectrom. Ion Phys., 1970, 5, 95. [all data]

Lifshitz and Grajower, 1969
Lifshitz, C.; Grajower, R., Dissociative electron capture and dissociative ionization in perfluoropropane, Intern. J. Mass Spectrom. Ion Phys., 1969, 3, 211. [all data]

Spyrou, Sauers, et al., 1983
Spyrou, S.M.; Sauers, I.; Christophorou, L.G., Electron attachment to the perfluoroalkanes n-CnF2n+2 (n = 1-6) and i-C4F10, J. Chem. Phys., 1983, 78, 7200. [all data]

Franklin, Wang, et al., 1974
Franklin, J.L.; Wang, J.L.-F.; Bennett, S.L.; Harland, P.W.; Margrave, J.L., Studies of the energies of negative ions at high temperatures, Adv. Mass Spectrom., 1974, 6, 319. [all data]

Harland and Franklin, 1974
Harland, P.W.; Franklin, J.L., Partitioning of excess energy in dissociative resonance capture processes, J. Chem. Phys., 1974, 61, 1621. [all data]

Lifshitz and Grajower, 1972
Lifshitz, C.; Grajower, R., Dissociative electron capture and dissociative ionization in perfluorocyclobutane, Int. J. Mass Spectrom. Ion Phys., 1972, 10, 25. [all data]

Harland and Thynne, 1970
Harland, P.; Thynne, J.C.J., Positive and negative ion formation in hexafluoroacetone by electron impact, J. Phys. Chem., 1970, 74, 52. [all data]

MacNeil and Thynne, 1970
MacNeil, K.A.G.; Thynne, J.C.J., The Formation of Negative Ions by Electron Impact on Silicon Tetrafluoride and Carbon Tetrafluoride, Int. J. Mass Spectrom. Ion Phys., 1970, 3, 6, 455, https://doi.org/10.1016/0020-7381(70)80004-3 . [all data]

Thynne and MacNeil, 1970, 2
Thynne, J.C.J.; MacNeil, K.A.G., Ionisation of Tetrafluoroethylene by Electron Impact, Int. J. Mass Spectrom. Ion Phys., 1970, 5, 3-4, 329, https://doi.org/10.1016/0020-7381(70)80026-2 . [all data]

MacNeil and Thynne, 1969
MacNeil, K.A.G.; Thynne, J.C.J., Ionization and Dissociation of Hexafluoroethane, and of 1,1,1-Trifluoroethane and Fluoroform, by Electron Impact, Int. J. Mass Spectrom. Ion Phys., 1969, 2, 1, 1, https://doi.org/10.1016/0020-7381(69)80001-X . [all data]

Bibby and Carter, 1963
Bibby, M.M.; Carter, G., Ionization and dissociation in some fluorocarbon gases, J. Chem. Soc. Faraday Trans., 1963, 59, 2455. [all data]

Page and Goode, 1969
Page, F.M.; Goode, G.C., Negative Ions and the Magnetron., Wiley, NY, 1969. [all data]

Tsuji, Aizawa, et al., 1995
Tsuji, M.; Aizawa, M.; Nishimura, Y., Mass spectroscopic studies on ion-molecule reactions of CF3+ with benzene and toluene at near-thermal energy, Chem. Lett., 1995, 3, 211. [all data]

Goto, Nakamura, et al., 1994
Goto, M.; Nakamura, K.; Toyoda, H.; Sugai, H., Cross section measurements for electron-impact dissociation of CHF3 into neutral and ionic fragments, Jpn. J. Appl. Phys. Part 1, 1994, 33, 3602. [all data]

Tarnovsky and Becker, 1993
Tarnovsky, V.; Becker, K., Absolute partial cross sections for the parent ionization of the CFx (x = 1-3) free radicals by electron impact, J. Chem. Phys., 1993, 98, 7868. [all data]

Fischer and Armentrout, 1990
Fischer, E.R.; Armentrout, P.B., The appearance energy of CF3+ from CF4: Ion/molecule reactions related to the thermochemistry of CF3+., Int. J. Mass Spectrom. Ion Processes, 1990, 101, 1. [all data]

Kime, Driscoll, et al., 1987
Kime, Y.J.; Driscoll, D.C.; Dowben, P.A., The stability of the carbon tetrahalide ions, J. Chem. Soc. Faraday Trans. 2, 1987, 83, 403. [all data]

Loguinov, Takhistov, et al., 1981
Loguinov, Y.; Takhistov, V.V.; Vatlina, L.P., Photoionization studies of substituted trimethylamines, Org. Mass Spectrom., 1981, 16, 239. [all data]

Berman, Beauchamp, et al., 1981
Berman, D.W.; Beauchamp, J.L.; Thorne, L.R., Ion cyclotron resonance and photoionization investigations of the thermochemistry and reactions of ions derived from CF3I, Int. J. Mass Spectrom. Ion Phys., 1981, 39, 47. [all data]

Aue and Bowers, 1979
Aue, D.H.; Bowers, M.T., Chapter 9. Stabilities of positive ions from equilibrium gas phase basicity measurements in Ions Chemistry,, ed. M.T. Bowers, 1979. [all data]

Syrvatka, Gil'burd, et al., 1973
Syrvatka, B.G.; Gil'burd, M.M.; Bel'ferman, A.L., Ion-dissociative processes of some halogen containing butadienes and particles structure, Zh. Org. Khim., 1973, 9, 1117. [all data]

Walter, Lifshitz, et al., 1969
Walter, T.A.; Lifshitz, C.; Chupka, W.A.; Berkowitz, J., Mass-spectrometric study of the photoionization of C2F4 and CF4, J. Chem. Phys., 1969, 51, 3531. [all data]

Ehlert, 1969, 2
Ehlert, T.C., Bonding in C1 and C2 fluorides, J. Phys. Chem., 1969, 73, 949. [all data]

Lifshitz and Chupka, 1967
Lifshitz, C.; Chupka, W.A., Photoionization of the CF3 free radical, J. Chem. Phys., 1967, 47, 3439. [all data]

Tarnovsky, Kurunczi, et al., 1993
Tarnovsky, V.; Kurunczi, P.; Rogozhnikov, D.; Becker, K., Absolute cross sections for the dissociative electron impact ionization of the CFx (x=1-3) free radicals, Int. J. Mass Spectrom. Ion Processes, 1993, 128, 181. [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

Paulino and Squires, 1991
Paulino, J.A.; Squires, R.R., Carbene Thermochemistry from Collision-Induced Dissociation Threshold Energy Measurements - The Heats of Formation of X1A1 CF2 and X1A1 CCl2, J. Am. Chem. Soc., 1991, 113, 15, 5573, https://doi.org/10.1021/ja00015a009 . [all data]

Graul and Squires, 1990
Graul, S.T.; Squires, R.R., Gas-Phase Acidities Derived from Threshold Energies for Activated Reactions, J. Am. Chem. Soc., 1990, 112, 7, 2517, https://doi.org/10.1021/ja00163a007 . [all data]


Notes

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