Monopotassium monooxide
- Formula: KO
- Molecular weight: 55.0977
- IUPAC Standard InChI: InChI=1S/K.O
- IUPAC Standard InChIKey: RQPCXPDUSNVHSU-UHFFFAOYSA-N
- CAS Registry Number: 12401-70-6
- 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 | 17.00 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1967 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 56.888 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1967 |
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.
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| Temperature (K) | 298. to 6000. |
|---|---|
| A | 8.918421 |
| B | 0.247374 |
| C | -0.005562 |
| D | 0.000475 |
| E | -0.035223 |
| F | 14.21190 |
| G | 67.40990 |
| H | 17.00000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1967 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, 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:
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
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 7.1 ± 0.1 | S | Butman, Kudin, et al., 1984 | LBLHLM |
| 8.0 ± 1.0 | S | Farber, Srivastava, et al., 1982 | LBLHLM |
| 8. ± 1. | EI | Ehlert, 1977 | LLK |
| 7.1 ± 0.2 | EI | Ehlert, 1977 | LLK |
Constants of diatomic molecules
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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: 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A 2Π | (347) 1 | (442) 1 | (2.33) 1 | |||||||||
| X 2Σ+ | 0 1 | (384) 2 | (2.22) 1 |
Notes
| 1 | Ab initio calculation by So and Richards, 1975. The relative position of the two states is in accordance with results of a magnetic deflection analysis of M + NO2 scattering products (M = alkali metal) by Herm and Herschbach, 1970. |
| 2 | Fundamental in solid nitrogen matrix Spiker and Andrews, 1973; the ab initio value is ωe = 467 cm-1 So and Richards, 1975. |
| 3 | From a merging beam study of the reaction CO+ (K,C) KO+ Rol, Entemann, et al., 1974. |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, 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]
Butman, Kudin, et al., 1984
Butman, M.F.; Kudin, L.S.; Krasnov, K.S.,
The Mass-spectrometric determination of the proton affinity of the molecules M2O (M = Na, K, Rb, Cs),
Russ. J. Inorg. Chem., 1984, 29, 1228, In original 2150. [all data]
Farber, Srivastava, et al., 1982
Farber, M.; Srivastava, R.D.; Moyer, J.W.,
Mass spectrometric determination of the thermodynamics of potassium hydroxide and minor potassium-containing species required in magnetohydrodynamic power systems,
J. Chem. Thermodyn., 1982, 14, 1103. [all data]
Ehlert, 1977
Ehlert, T.C.,
Mass spectrometric investigations of the oxides of potassium,
High Temp. Sci., 1977, 9, 237. [all data]
So and Richards, 1975
So, S.P.; Richards, W.G.,
The electronic ground states of alkali monoxides,
Chem. Phys. Lett., 1975, 32, 227. [all data]
Herm and Herschbach, 1970
Herm, R.R.; Herschbach, D.R.,
Molecular beam kinetics: reactions of alkali atoms with NO2 and CH3NO2,
J. Chem. Phys., 1970, 52, 5783. [all data]
Spiker and Andrews, 1973
Spiker, R.C., Jr.; Andrews, L.,
Matrix reactions of Na, K, Rb, and Cs atoms with N2O: infrared spectra geometries of K2O, Rb2O, and Cs2O,
J. Chem. Phys., 1973, 58, 713. [all data]
Rol, Entemann, et al., 1974
Rol, P.K.; Entemann, E.A.; Wendell, K.L.,
Merging beams studies of Na, K, and Mg collisions with atmospheric ions,
J. Chem. Phys., 1974, 61, 2050. [all data]
Notes
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- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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