Potassium fluoride
- Formula: FK
- Molecular weight: 58.0967
- IUPAC Standard InChI: InChI=1S/FH.K/h1H;/q;+1/p-1
- IUPAC Standard InChIKey: NROKBHXJSPEDAR-UHFFFAOYSA-M
- CAS Registry Number: 7789-23-3
- Chemical structure:
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Gas phase 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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -326.77 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1969 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 226.60 | J/mol*K | Review | Chase, 1998 | Data 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.
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| Temperature (K) | 3000. to 6000. |
|---|---|
| A | 37.20911 |
| B | 0.861908 |
| C | -0.047662 |
| D | 0.004070 |
| E | -0.201727 |
| F | -338.5785 |
| G | 270.2433 |
| H | -326.7704 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1969 |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Constants of diatomic molecules, 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
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
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- + FK = (F- • FK)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 223.8 ± 3.3 | kJ/mol | TDAs | Nikitin, Sidorov, et al., 1981 | gas phase; value altered from reference due to conversion from electron convention to ion convention; B |
| ΔrH° | 200. ± 4.2 | kJ/mol | TDEq | Sidorov, Nikitin, et al., 1980 | gas phase; Fluoride Affinity:1100K, ΔHf(KF2-):298K; value altered from reference due to conversion from electron convention to ion convention; B |
| ΔrH° | >220. ± 21. | kJ/mol | TDEq | Gusarov, Gorokhov, et al., 1979 | gas phase; value altered from reference due to conversion from electron convention to ion convention; B |
| ΔrH° | 194. | kJ/mol | MS | Nikitin, Skokan, et al., 1979 | gas phase; Knudsen cell; M |
By formula: AlF4- + FK = (AlF4- • FK)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 120. ± 8.4 | kJ/mol | TDAs | Gusarov, Gorokhov, et al., 1979 | gas phase; value altered from reference due to conversion from electron convention to ion convention; B |
By formula: Be2F5- + FK = (Be2F5- • FK)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 290. ± 10. | kJ/mol | N/A | Nikitin, Sorokin, et al., 1980 | gas phase; value altered from reference due to conversion from electron convention to ion convention; B |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, Constants of diatomic molecules, 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:
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
B - John E. Bartmess
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 0.23 | NBAE | De Vreugd, Wijnaendts van Resandt, et al., 1979 | B |
| <1.5004 | IMRE | Sidorov, Skokan, et al., 1980 | B |
| 1.04 ± 0.21 | EIAE | Shevchenko, Iljin, et al., 1976 | From K2BO2F; value altered from reference due to conversion from electron convention to ion convention; B |
| >1.25999 | EIAE | Ebinghaus, 1964 | From (KF)2; B |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| K+ | 9.8 | F | EI | Schafer and Rabeneck, 1987 | LBLHLM |
| K+ | 9.54 ± 0.20 | F | EI | Shevchenko, Iljin, et al., 1976 | LLK |
| K+ | 9.5 ± 0.3 | F | EI | Hastie, Zmbov, et al., 1968 | RDSH |
Ion clustering data
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, 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
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
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
By formula: AlF4- + FK = (AlF4- • FK)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 120. ± 8.4 | kJ/mol | TDAs | Gusarov, Gorokhov, et al., 1979 | gas phase; value altered from reference due to conversion from electron convention to ion convention; B |
By formula: Be2F5- + FK = (Be2F5- • FK)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 290. ± 10. | kJ/mol | N/A | Nikitin, Sorokin, et al., 1980 | gas phase; value altered from reference due to conversion from electron convention to ion convention; B |
+
= (
•
)
By formula: F- + FK = (F- • FK)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 223.8 ± 3.3 | kJ/mol | TDAs | Nikitin, Sidorov, et al., 1981 | gas phase; value altered from reference due to conversion from electron convention to ion convention; B |
| ΔrH° | 200. ± 4.2 | kJ/mol | TDEq | Sidorov, Nikitin, et al., 1980 | gas phase; Fluoride Affinity:1100K, ΔHf(KF2-):298K; value altered from reference due to conversion from electron convention to ion convention; B |
| ΔrH° | >220. ± 21. | kJ/mol | TDEq | Gusarov, Gorokhov, et al., 1979 | gas phase; value altered from reference due to conversion from electron convention to ion convention; B |
| ΔrH° | 194. | kJ/mol | MS | Nikitin, Skokan, et al., 1979 | gas phase; Knudsen cell; M |
Constants of diatomic molecules
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering 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: Klaus P. Huber and Gerhard H. Herzberg
Data collected through January, 1977
| Symbol | Meaning |
|---|---|
| State | electronic state and / or symmetry symbol |
| Te | minimum electronic energy (cm-1) |
| ωe | vibrational constant – first term (cm-1) |
| ωexe | vibrational constant – second term (cm-1) |
| ωeye | vibrational constant – third term (cm-1) |
| Be | rotational constant in equilibrium position (cm-1) |
| αe | rotational constant – first term (cm-1) |
| γe | rotation-vibration interaction constant (cm-1) |
| De | centrifugal distortion constant (cm-1) |
| βe | rotational constant – first term, centrifugal force (cm-1) |
| re | internuclear distance (Å) |
| Trans. | observed transition(s) corresponding to electronic state |
| ν00 | position of 0-0 band (units noted in table) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| The electron energy loss spectrum Geiger and Pfeiffer, 1968 has peaks at 6.8, 8.5, 9.6 and 18.4, 22.5, 23.8,24.9 eV. | ||||||||||||
| A 1 | A ← X | |||||||||||
| ↳Barrow and Caunt, 1953 | ||||||||||||
| X 1Σ+ | 0 | 428 2 | (2.4) | 0.279937413 | 2.335038E-3 3 | 0.04834E-5 4 | 2.171457 5 | |||||
| ↳Ritchie and Lew, 1964; Baikov and Vasilevskii, 1967 | ||||||||||||
| Rotation sp. | ||||||||||||
| ↳Grabner and Hughes, 1950; Green and Lew, 1960; Veazey and Gordy, 1965; Dijkerman, Flegel, et al., 1972 | ||||||||||||
| Mol. beam rf electric 6 | ||||||||||||
| ↳Bonczyk and Hughes, 1967; missing citation; Van Wachem, De Leeuw, et al., 1967 | ||||||||||||
| and magn. reson. 7 | ||||||||||||
| ↳Mehran, Brooks, et al., 1966 | ||||||||||||
Notes
| 1 | Fluctuation bands, 34300 - 46700 cm-1 (absorption). |
| 2 | From the IR spectrum Ritchie and Lew, 1964, Baikov and Vasilevskii, 1967. Veazey and Gordy, 1965, applying the Dunham theory to the microwave results, calculate ωe = 426.04 Veazey and Gordy, 1965 and ωexe = 2.43 Veazey and Gordy, 1965. |
| 3 | missing note |
| 4 | missing note |
| 5 | Rot.-vibr. sp. 9 |
| 6 | μel[D] = 8.5583 + 0.06841(v+1/2) + 0.000256(v+1/2)2 Graff and Runolfsson, 1963,105, electric quadrupole and other hyperfine coupling constants Schlier, 1957, Bonczyk and Hughes, 1967, missing citation; see also Grabner and Hughes, 1950, Green and Lew, 1960. |
| 7 | gJ = (-)0.0364 μN Mehran, Brooks, et al., 1966. |
| 8 | Thermochemical value Brewer and Brackett, 1961, Bulewicz, Phillips, et al., 1961; an upper limit, D00 ≤ 5.28eV, was derived Barrow and Caunt, 1953, from the analysis of the fluctuation bands. |
| 9 | IR spectrum of matrix isolated KF Ismail, Hauge, et al., 1973. |
| 10 | missing note |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Constants of diatomic molecules, 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]
Nikitin, Sidorov, et al., 1981
Nikitin, M.I.; Sidorov, L.N.; Skokan, E.V.; Sorokin, I.D.,
Mass spectrometric determination of the heats of formation of ScF4- and KF2-,
Russ. J. Phys. Chem., 1981, 55, 1107. [all data]
Sidorov, Nikitin, et al., 1980
Sidorov, L.N.; Nikitin, M.I.; Skokan, E.V.; Sorokin, I.D.,
Mass-spectrometric determination of enthalpies of dissociation of gaseous complex fluorides into neutral and charged particles. II. Heats of formation of AlF4- and KF2-,
Int. J. Mass Spectrom. Ion Phys., 1980, 35, 203. [all data]
Gusarov, Gorokhov, et al., 1979
Gusarov, A.V.; Gorokhov, L.N.; Pyatenko, A.T.; Sidorova, I.V.,
Negative ions in the vapors of inorganic compounds,
Adv. Mass Spectrom., 1979, 8, 262. [all data]
Nikitin, Skokan, et al., 1979
Nikitin, M.I.; Skokan, E.V.; Sorokin, I.D.; Sidorov, L.N.,
Sov. Phys. Dokl., 1979, 247, 594. [all data]
Nikitin, Sorokin, et al., 1980
Nikitin, M.I.; Sorokin, I.D.; Skokan, E.V.; Sidorov, L.N.,
Negative Ions in the Saturated Vapors of the Potassium Fluoride - Hafnium Tetrafluoride and Potassium Fluoride - Beryllium Difluoride Systems,
Russ. J. Phys. Chem., 1980, 54, page]. [all data]
De Vreugd, Wijnaendts van Resandt, et al., 1979
De Vreugd, C.; Wijnaendts van Resandt, R.W.; Los, J.; Smith, B.,
Differential Cross Sections for Collisions of Negative Halogen Ions and Alkali Atoms,
Chem. Phys., 1979, 42, 3, 305, https://doi.org/10.1016/0301-0104(79)80078-6
. [all data]
Sidorov, Skokan, et al., 1980
Sidorov, L.N.; Skokan, E.V.; Nitikin, M.I.; Sorokin, I.D.,
Mass spectrometric determination of enthalpies of dissociation of gaseous complex fluorides into neutral and charged particles. III. Heat of formation of UF5- and electron affinity of UF5,
Int. J. Mass Spectrom. Ion Phys., 1980, 35, 215. [all data]
Shevchenko, Iljin, et al., 1976
Shevchenko, V.E.; Iljin, M.K.; Nikitin, O.T.; Sidorov, L.N.,
Mass-spectrometric study of mixed dimers M2BO2F,
Int. J. Mass Spectrom. Ion Phys., 1976, 21, 279. [all data]
Ebinghaus, 1964
Ebinghaus, H.Z.,
Negative Ionen aus Alkalihalogeniden und Electronenaffinitaten der Alkalimetalle und Alkalihalogenide,
Z. Naturfor., 1964, 19A, 727. [all data]
Schafer and Rabeneck, 1987
Schafer, H.; Rabeneck, H.,
Massenspektroskopische untersuchung der borfluorid-komplexe ABF4,
Z. Anorg. Allg. Chem., 1987, 545, 224. [all data]
Hastie, Zmbov, et al., 1968
Hastie, J.W.; Zmbov, K.F.; Margrave, J.L.,
Mass spectrometric studies at high temperatures. XXIII. Vapor equilibria over molten NaSnF3 and KSnF3,
J. Inorg. Nucl. Chem., 1968, 30, 729. [all data]
Geiger and Pfeiffer, 1968
Geiger, J.; Pfeiffer, H.-C.,
Untersuchung der Anregung innerer Elektronen von Alkalihalogenidmolekulen im Energieverlustspektrum von 25 keV-Elektronen,
Z. Phys., 1968, 208, 105. [all data]
Barrow and Caunt, 1953
Barrow, R.F.; Caunt, A.D.,
The ultra-violet absorption spectra of some gaseous alkali-metal halides and the dissociation energy of fluorine,
Proc. R. Soc. London A, 1953, 219, 120. [all data]
Ritchie and Lew, 1964
Ritchie, R.K.; Lew, H.,
Infrared spectra of NaF and KF,
Can. J. Phys., 1964, 42, 43. [all data]
Baikov and Vasilevskii, 1967
Baikov, V.I.; Vasilevskii, K.P.,
Infrared spectra of sodium, potassium, rubidium, and cesium fluoride vapors,
Opt. Spectrosc. Engl. Transl., 1967, 22, 198, In original 364. [all data]
Grabner and Hughes, 1950
Grabner, L.; Hughes, V.,
The radiofrequency spectrum of K39F by the electric resonance method,
Phys. Rev., 1950, 79, 819. [all data]
Green and Lew, 1960
Green, G.W.; Lew, H.,
Rotational spectrum of K39F by the molecular beam electric resonance method,
Can. J. Phys., 1960, 38, 482. [all data]
Veazey and Gordy, 1965
Veazey, S.E.; Gordy, W.,
Millimeter-wave molecular-beam spectroscopy: alkali fluorides,
Phys. Rev. A: Gen. Phys., 1965, 138, 1303. [all data]
Dijkerman, Flegel, et al., 1972
Dijkerman, H.; Flegel, W.; Graff, G.; Monter, B.,
Beitrage zum Stark-Effekt der molekule 205Tl19F und 39K19F,
Z. Naturforsch. A, 1972, 27, 100. [all data]
Bonczyk and Hughes, 1967
Bonczyk, P.A.; Hughes, V.W.,
Hyperfine structure of the v=O, J=l state in Rb85F, Rb87F, K39F, and K41F by the molecular-beam electric-resonance method,
Phys. Rev., 1967, 161, 15. [all data]
Van Wachem, De Leeuw, et al., 1967
Van Wachem, R.; De Leeuw, F.H.; Dymanus, A.,
Dipole moments of KF and KBr measured by the molecular-beam electric-resonance method,
J. Chem. Phys., 1967, 47, 2256. [all data]
Mehran, Brooks, et al., 1966
Mehran, F.; Brooks, R.A.; Ramsey, N.F.,
Rotational magnetic moments of alkali-halide molecules,
Phys. Rev., 1966, 141, 93. [all data]
Graff and Runolfsson, 1963
Graff, G.; Runolfsson, O.,
Gleichzeitige Messung von Hyperfeinstruktur, Stark-Effekt und Zeeman-Effekt des 39K19F mit einer Molekulstrahlresonanzapparatur,
Z. Phys., 1963, 176, 90. [all data]
Schlier, 1957
Schlier, C.,
Messung der Hyperfeinstruktur des Kaliumfluorids mit der Molekulstrahlresonanzmethode,
Z. Phys., 1957, 147, 600. [all data]
Brewer and Brackett, 1961
Brewer, L.; Brackett, E.,
The dissociation energies of gaseous alkali halides,
Chem. Rev., 1961, 61, 425. [all data]
Bulewicz, Phillips, et al., 1961
Bulewicz, E.M.; Phillips, L.F.; Sugden, T.M.,
Determination of dissociation constants and heats of formation of simple molecules by flame photometry. Part 8. Stabilities of the gaseous diatomic halides of certain metals,
Trans. Faraday Soc., 1961, 57, 921. [all data]
Ismail, Hauge, et al., 1973
Ismail, Z.K.; Hauge, R.H.; Margrave, J.L.,
Infrared spectra of sodium and potassium fluorides by matrix isolation,
J. Inorg. Nucl. Chem., 1973, 35, 3201. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Constants of diatomic molecules, References
- Symbols used in this document:
AE Appearance energy EA Electron affinity S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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