Cyclobutane, octafluoro-
- Formula: C4F8
- Molecular weight: 200.0300
- IUPAC Standard InChIKey: BCCOBQSFUDVTJQ-UHFFFAOYSA-N
- CAS Registry Number: 115-25-3
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Cyclooctafluorobutane; Freon C 318; Freon 318; FC-C 318; Octafluorocyclobutane; Perfluorocyclobutane; Propellant C 318; R C318; Halocarbon C-138; UN 1976; Cyclobutane, 1,1,2,2,3,3,4,4-octafluoro-
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Condensed phase thermochemistry data
Go To: Top, Reaction thermochemistry 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: Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
S°liquid | 69.57 | cal/mol*K | N/A | Furukawa, McCoskey, et al., 1954 |
Constant pressure heat capacity of liquid
Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
53.15 | 296.41 | Ponomareva, 1982 | T = 240 to 340 K. Value is unsmoothed experimental datum: Cp given as 1.112 J/g*K. |
50.136 | 268.52 | Furukawa, McCoskey, et al., 1954 | T = 17 to 270 K. Value is unsmoothed experimental datum. |
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 by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
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
By formula: C4F8 + 4Na = 4C + 8FNa
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -714.5 ± 2.2 | kcal/mol | Ccb | Kolesov, Talakin, et al., 1968 | gas phase; Correction of Kolesov, Talakin, et al., 1964 |
By formula: 2C2F4 = C4F8
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -50.3 | kcal/mol | Eqk | Atkinson and Trenwith, 1953 | gas phase; At 527-800 °K |
Gas phase ion energetics data
Go To: Top, Condensed phase thermochemistry data, Reaction 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:
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess
View reactions leading to C4F8+ (ion structure unspecified)
Electron affinity determinations
EA (eV) | Method | Reference | Comment |
---|---|---|---|
0.630 ± 0.050 | Kine | Miller, Freidman, et al., 2004 | Re-determination of foreward/reverse rates constants, to refute Hiraoka, Mizuno, et al., 2002 higher value.See also Bopp, Roscioli, et al., 2007; B |
0.630 ± 0.020 | Kine | Miller, Morris, et al., 1994 | FALP experiment: ratio of attach/detach rate constants; B |
0.520 ± 0.052 | IMRE | Hiraoka, Mizuno, et al., 2002 | isomer, accessible at >350 K; B |
1.05 ± 0.10 | IMRE | Hiraoka, Mizuno, et al., 2002 | equilibrium vs. SF6; may be kinetic stationary state; B |
>0.40 ± 0.30 | Endo | Lifshitz, Tiernan, et al., 1973 | B |
Appearance energy determinations
Ion | AE (eV) | Other Products | Method | Reference | Comment |
---|---|---|---|---|---|
CF3+ | 15.7 | ? | EI | Bibby and Carter, 1963 | RDSH |
C2F4+ | 12.25 | ? | EI | Bibby and Carter, 1963 | RDSH |
C3F5+ | 12.25 | ? | EI | Bibby and Carter, 1963 | RDSH |
F+ | 24.0 | ? | EI | Bibby and Carter, 1963 | RDSH |
References
Go To: Top, Condensed phase thermochemistry data, Reaction 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.
Furukawa, McCoskey, et al., 1954
Furukawa, G.T.; McCoskey, R.E.; Reilly, M.L.,
Heat capacity, heats of transitions, fusion and vaporization, and vapor pressure of octafluorocyclobutane,
J. Res., 1954, NBS 52, 11-16. [all data]
Ponomareva, 1982
Ponomareva, O.P.,
Study of the isobaric heat capacity of Freon-113 and Freon-C318 in a broad range of parametric conditions, Teplofiz. Svoistva Veshchestv i Materialov,
Moskva, 1982, 16, 64-70. [all data]
Kolesov, Talakin, et al., 1968
Kolesov, V.P.; Talakin, O.G.; Skuratov, S.M.,
Enthalpy of formation of some specimens of amorphous carbon,
Russ. J. Phys. Chem. (Engl. Transl.), 1968, 42, 1218-1220. [all data]
Kolesov, Talakin, et al., 1964
Kolesov, V.P.; Talakin, O.G.; Skuratov, S.M.,
Standard enthalpy of formation of perfluorocyclobutane,
Russ. J. Phys. Chem. (Engl. Transl.), 1964, 38, 930-931. [all data]
Atkinson and Trenwith, 1953
Atkinson, B.; Trenwith, A.B.,
424. The thermal decomposition of tetrafluorethylene,
J. Chem. Soc. London, 1953, 2082-2087. [all data]
Miller, Freidman, et al., 2004
Miller, T.M.; Freidman, J.F.; Viggiano, A.A.,
Electron Attachment and detachment and the Electron Affinity of cyclo-C4F8,
J. Chem. Phys., 2004, 120, 15, 7024-7028, https://doi.org/10.1063/1.1683082
. [all data]
Hiraoka, Mizuno, et al., 2002
Hiraoka, K.; Mizuno, T.; Eguchi, D.; Takao, K.; Iino, T.; Yamabe, S.,
Gas-phase ion/molecule reactions in octafluorocyclobutane,
J. Chem. Phys., 2002, 116, 17, 7574-7582, https://doi.org/10.1063/1.1400787
. [all data]
Bopp, Roscioli, et al., 2007
Bopp, J.C.; Roscioli, J.R.; Johnson, M.A.; Miller, T.M.; Viggiano, A.A.; Villano, S.M.; Wren, S.W.; Lineberger,
Spectroscopic characterization of the isolated SF6- and C4F8- anions: Observation of very long harmonic progressions in symmetric deformation modes upon photodetachment,
J. Phys. Chem. A, 2007, 111, 7, 1214-1221, https://doi.org/10.1021/jp0665372
. [all data]
Miller, Morris, et al., 1994
Miller, T.M.; Morris, R.A.; Miller, A.E.S.; Viggiano, A.A.; Paulson, J.F.,
Observation of Thermal Electron Detachment from Cyclo-C4F8- in FALP Experiments,
Int. J. Mass Spectrom. Ion Proc., 1994, 135, 2-3, 195, https://doi.org/10.1016/0168-1176(94)03999-2
. [all data]
Lifshitz, Tiernan, et al., 1973
Lifshitz, C.; Tiernan, T.O.; Hughes, B.M.,
Electron affinities from endothermic negative-ion charge transfer reactions. IV. SF6, selected fluorocarbons, and other polyatomic molecules,
J. Chem. Phys., 1973, 59, 3182. [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]
Notes
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- Symbols used in this document:
AE Appearance energy Cp,liquid Constant pressure heat capacity of liquid EA Electron affinity S°liquid Entropy of liquid at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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