Uranium hexafluoride
- Formula: F6U
- Molecular weight: 352.01933
- IUPAC Standard InChI: InChI=1S/6FH.U/h6*1H;/q;;;;;;+6/p-6
- IUPAC Standard InChIKey: SANRKQGLYCLAFE-UHFFFAOYSA-H
- CAS Registry Number: 7783-81-5
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Uranium fluoride (UF6); Uranium fluoride (238UF6); UF6; Uranium fluoride (UF6), (OC-6-11)-; Uranium fluoride; UN 2977; UN 2978; Hexafluorouranium; Uranium-238 hexafluoride
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Phase change 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: William E. Acree, Jr., James S. Chickos
Enthalpy of vaporization
| ΔvapH (kcal/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 7.05 | 352. | Oliver, Milton, et al., 1953 | Based on data from 337. to 389. K. |
Reaction thermochemistry data
Go To: Top, Phase change 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: John E. Bartmess
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: F- + F6U = (F- • F6U)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 56.6 ± 7.2 | kcal/mol | Ther | Pyatenko, Guasarov, et al., 1984 | gas phase; Critical review; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 46. ± 10. | kcal/mol | IMRB | Beauchamp, 1976 | gas phase |
Gas phase ion energetics data
Go To: Top, Phase change 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:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 5.06 ± 0.20 | R-A | Borshchevskii, Boltalina, et al., 1988 | value altered from reference due to conversion from electron convention to ion convention; B |
| 5.51 ± 0.31 | R-A | Pyatenko, Guasarov, et al., 1984 | Critical review; value altered from reference due to conversion from electron convention to ion convention; B |
| 5.13 ± 0.31 | R-A | Skokan, Sorokin, et al., 1983 | Fluoride Affinity: 13.1±2 kcal > UF4; value altered from reference due to conversion from electron convention to ion convention; B |
| >5.099621 | NBIE | Compton, 1977 | B |
| 4.90 ± 0.50 | IMRB | Beauchamp, 1976 | Endo F- transfer to BF3 at 1.5 eV observed; B |
| 6.33 ± 0.50 | TDEq | Pyatenko, Gusarov, et al., 1980 | B |
| 5.98 ± 0.43 | R-A | Mallouk, Rosenthal, et al., 1984 | B |
| >5.499959 | IMRB | Annis and Stockdale, 1980 | B |
| >3.6079 | IMRB | Streit and Newton, 1980 | B |
| >4.30 ± 0.40 | NBIE | Mathur, Rothe, et al., 1977 | B |
| 2.90973 | SI | Page and Goode, 1969 | The Magnetron method, lacking mass analysis, is not considered reliable.; B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 14.00 ± 0.10 | EI | Hildenbrand, 1977 | LLK |
| 14.14 | PE | Potts, Lempka, et al., 1970 | Vertical value; RDSH |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| F4U+ | 17.4 ± 0.1 | 2F | EI | Hildenbrand, 1977 | LLK |
| F5U+ | 14.24 ± 0.10 | F | EI | Hildenbrand, 1977 | LLK |
References
Go To: Top, Phase change 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.
Oliver, Milton, et al., 1953
Oliver, George D.; Milton, H.T.; Grisard, J.W.,
The Vapor Pressure and Critical Constants of Uranium Hexafluoride 1,
J. Am. Chem. Soc., 1953, 75, 12, 2827-2829, https://doi.org/10.1021/ja01108a011
. [all data]
Pyatenko, Guasarov, et al., 1984
Pyatenko, A.T.; Guasarov, A.V.; Gorokhov, L.N.,
Thermochemistry of Negative Ions in the U-F System,
Russ. J. Phys. Chem., 1984, 58, 1. [all data]
Beauchamp, 1976
Beauchamp, J.L.,
Ion cyclotron resonance studies of endothermic reactions of UF6-Generated by surface ionization,
J. Chem. Phys., 1976, 64, 929. [all data]
Borshchevskii, Boltalina, et al., 1988
Borshchevskii, A.Ya.; Boltalina, O.V.; Sorokin, I.D.; Sidorov, L.N.,
Thermochemical Quantities for Gas Phase Iron, Uranium, and Molybdenum Fluorides, and Their Negative Ions.,
J. Chem. Thermodyn., 1988, 20, 5, 523, https://doi.org/10.1016/0021-9614(88)90080-8
. [all data]
Skokan, Sorokin, et al., 1983
Skokan, E.V.; Sorokin, I.D.; Nikitin, M.I.; Chilingarov, N.S.; Sidorov, L.N.,
The electron affinity of UF6,
Russ. J. Phys. Chem., 1983, 57, 1745. [all data]
Compton, 1977
Compton, R.N.,
On the formation of positive and negative ions in gaseous UF6,
J. Chem. Phys., 1977, 66, 4478. [all data]
Pyatenko, Gusarov, et al., 1980
Pyatenko, A.T.; Gusarov, A.V.; Gorokhov, L.N.,
Thermochemical Properties of Negative Ions in Vapor over UF4,
High Temp., 1980, 18, 857. [all data]
Mallouk, Rosenthal, et al., 1984
Mallouk, T.E.; Rosenthal, G.L.; Muller, G.; Brusasco, R.; Bartlett, N.,
Fluoride ion affinities of GeF4 and BF4 from thermodynamic and structural data for (SF2)2GeF6, ClO2GeF5, and ClO2BF4,
Inorg. Chem., 1984, 23, 3167. [all data]
Annis and Stockdale, 1980
Annis, B.K.; Stockdale, J.A.D.,
Internal excitation of UF6- ions in collisions with argon atoms,
Chem. Phys. Lett., 1980, 74, 365. [all data]
Streit and Newton, 1980
Streit, G.E.; Newton, T.W.,
Negative ion-uranium hexafluoride charge transfer reactions,
J. Chem. Phys., 1980, 73, 3178. [all data]
Mathur, Rothe, et al., 1977
Mathur, B.P.; Rothe, R.W.; Reck, G.P.,
Ionization reactions of metal hexafluorides with alkali atoms and dimers,
J. Chem. Phys., 1977, 67, 377. [all data]
Page and Goode, 1969
Page, F.M.; Goode, G.C.,
Negative Ions and the Magnetron., Wiley, NY, 1969. [all data]
Hildenbrand, 1977
Hildenbrand, D.L.,
Thermochemistry of gaseous UF5 and UF4,
J. Chem. Phys., 1977, 66, 4788. [all data]
Potts, Lempka, et al., 1970
Potts, A.W.; Lempka, H.J.; Streets, D.G.; Price, W.C.,
Photoelectron spectra of the halides of elements in groups III, IV, V and VI,
Phil. Trans. Roy. Soc. (London), 1970, A268, 59. [all data]
Notes
Go To: Top, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy EA Electron affinity ΔrH° Enthalpy of reaction at standard conditions ΔvapH Enthalpy of vaporization - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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