iron difluoride
- Formula: F2Fe
- Molecular weight: 93.842
- CAS Registry Number: 7789-28-8
- Information on this page:
- Options:
Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -93.100 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 63.382 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1965 |
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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 3000. to 6000. |
|---|---|
| A | 14.99440 |
| B | 0.535214 |
| C | -0.154445 |
| D | 0.012072 |
| E | 0.244254 |
| F | -97.30129 |
| G | 81.37321 |
| H | -93.10000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1965 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -161.22 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 22.12 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -168.70 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1965 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 20.78 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1965 |
Liquid 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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 1373. to 3000. |
|---|---|
| A | 23.50000 |
| B | 5.255801×10-11 |
| C | -2.871631×10-11 |
| D | 4.888531×10-12 |
| E | 1.702391×10-12 |
| F | -168.2280 |
| G | 50.55559 |
| H | -161.2210 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1965 |
Solid 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 (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
| Temperature (K) | 298. to 1373. |
|---|---|
| A | 14.70710 |
| B | 9.529221 |
| C | -5.711191 |
| D | 1.172511 |
| E | -0.071081 |
| F | -173.7010 |
| G | 35.58241 |
| H | -168.7000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1965 |
Phase change data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, 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
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 64.8 ± 0.48 | kcal/mol | N/A | Bardi, Brunetti, et al., 1996 | |
| ΔsubH° | 64.5 ± 0.7 | kcal/mol | N/A | Zhuravleva, Alikhanyan, et al., 1976 | See also Bardi, Brunetti, et al., 1996. |
Enthalpy of sublimation
| ΔsubH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 62.9 ± 0.48 | 1068. | TE,ME | Bardi, Brunetti, et al., 1996 | Based on data from 958. to 1178. K. |
| 62.9 ± 0.7 | 995. | ME | Zhuravleva, Alikhanyan, et al., 1976 | Based on data from 848. to 1142. K. See also Bardi, Brunetti, et al., 1996. |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, 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
(F- • 4294967295F2Fe) + F2Fe = F-
By formula: (F- • 4294967295F2Fe) + F2Fe = F-
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 87.7 ± 3.6 | kcal/mol | TDAs | Boltalina, Borshchevskii, et al., 1992 | gas phase; Critical review; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 85.8 ± 2.6 | kcal/mol | TDEq | Borshchevskii, Boltalina, et al., 1988 | gas phase; Fluoride Affinity: FeF2 < FeF3 by 22.6±2.6 kcal/mol.; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 89.3 ± 4.1 | kcal/mol | TDEq | Kuznetsov, Korobov, et al., 1986 | gas phase; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 85.8 ± 2.1 | kcal/mol | TDEq | Sidirov, Borshchevsky, et al., 1986 | gas phase; Corrections to Sorokin, Sidorov, et al., 1981, better neutral pressure determination; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 105.4 ± 3.3 | kcal/mol | TDEq | Sorokin, Sidorov, et al., 1981 | gas phase; Fluoride Affinity: 15.3±1.2 kcal < AlF3; value altered from reference due to conversion from electron convention to ion convention |
By formula: F3Fe- + F2Fe = F5Fe2-
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 48.3 ± 8.8 | kcal/mol | TDEq | Sidirov, Borshchevsky, et al., 1986 | gas phase; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 48.1 ± 1.0 | kcal/mol | TDAs | Sorokin, Sidorov, et al., 1981 | gas phase; ΔHf(A-) at 0 K; value altered from reference due to conversion from electron convention to ion convention |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Ion clustering data, NIST Free Links, 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 F2Fe+ (ion structure unspecified)
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| <2.69291 | TDEq | Borshchevskii, Boltalina, et al., 1988 | B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 11.3 ± 0.3 | EI | Kent and Margrave, 1965 | RDSH |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| FeF+ | 12.6 ± 0.3 | F | EI | Kent and Margrave, 1965 | RDSH |
| Fe+ | 16.5 ± 0.3 | ? | EI | Kent and Margrave, 1965 | RDSH |
Ion clustering data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, NIST Free Links, 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. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
(F- • 4294967295F2Fe) + F2Fe = F-
By formula: (F- • 4294967295F2Fe) + F2Fe = F-
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 87.7 ± 3.6 | kcal/mol | TDAs | Boltalina, Borshchevskii, et al., 1992 | gas phase; Critical review; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 85.8 ± 2.6 | kcal/mol | TDEq | Borshchevskii, Boltalina, et al., 1988 | gas phase; Fluoride Affinity: FeF2 < FeF3 by 22.6±2.6 kcal/mol.; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 89.3 ± 4.1 | kcal/mol | TDEq | Kuznetsov, Korobov, et al., 1986 | gas phase; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 85.8 ± 2.1 | kcal/mol | TDEq | Sidirov, Borshchevsky, et al., 1986 | gas phase; Corrections to Sorokin, Sidorov, et al., 1981, better neutral pressure determination; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 105.4 ± 3.3 | kcal/mol | TDEq | Sorokin, Sidorov, et al., 1981 | gas phase; Fluoride Affinity: 15.3±1.2 kcal < AlF3; value altered from reference due to conversion from electron convention to ion convention |
By formula: F3Fe- + F2Fe = F5Fe2-
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 48.3 ± 8.8 | kcal/mol | TDEq | Sidirov, Borshchevsky, et al., 1986 | gas phase; value altered from reference due to conversion from electron convention to ion convention |
| ΔrH° | 48.1 ± 1.0 | kcal/mol | TDAs | Sorokin, Sidorov, et al., 1981 | gas phase; ΔHf(A-) at 0 K; value altered from reference due to conversion from electron convention to ion convention |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, 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]
Bardi, Brunetti, et al., 1996
Bardi, Gianpiero; Brunetti, Bruno; Piacente, Vincenzo,
Vapor Pressure and Standard Enthalpies of Sublimation of Iron Difluoride, Iron Dichloride, and Iron Dibromide,
J. Chem. Eng. Data, 1996, 41, 1, 14-20, https://doi.org/10.1021/je950115w
. [all data]
Zhuravleva, Alikhanyan, et al., 1976
Zhuravleva, L.V.; Alikhanyan, A.S.; Sidorov, L.N.,
Russ. J. Phys. Chem., 1976, 50, 818. [all data]
Boltalina, Borshchevskii, et al., 1992
Boltalina, O.V.; Borshchevskii, A.Y.; Sidorov, L.N.,
Thermochemistry of 3d Elements Fluorides and Their Negative Ions in Gas Phase,
Russ. J. Phys. Chem., 1992, 66, 1223. [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]
Kuznetsov, Korobov, et al., 1986
Kuznetsov, S.V.; Korobov, M.V.; Savinova, L.N.; Sidirov, L.N.,
Enthalpy of the addition of the F- ion to copper and iron difluorides,
Russ. J. Phys. Chem., 1986, 60, 766. [all data]
Sidirov, Borshchevsky, et al., 1986
Sidirov, L.N.; Borshchevsky, A.Ya.; Boltalina, O.V.; Sorokin, I.D.; Skokan, E.V.,
Electron affinities of gaseous iron fluorides and dimers,
Int. J. Mass Spectrom. Ion Processes, 1986, 73, 1. [all data]
Sorokin, Sidorov, et al., 1981
Sorokin, I.D.; Sidorov, L.N.; Nikitin, M.I.; Skokan, E.V.,
Mass-spectrometric determination of the enthalpies of dissociation of gaseous complex fluorides into neutral and charged particles. V. Heats of formation of FeF3- and FeF4-,
Int. J. Mass Spectrom. Ion Phys., 1981, 41, 45. [all data]
Kent and Margrave, 1965
Kent, R.A.; Margrave, J.L.,
Mass spectrometric studies at high temperatures. VIII. The sublimation pressure of iron(II) fluoride,
J. Am. Chem. Soc., 1965, 87, 4754. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References
- Symbols used in this document:
AE Appearance energy EA Electron affinity S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔsubH Enthalpy of sublimation ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.