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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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 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, 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.
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
Go To: Top, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy EA Electron affinity - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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