Chromium monoxide
- Formula: CrO
- Molecular weight: 67.9955
- IUPAC Standard InChIKey: XVOFZWCCFLVFRR-UHFFFAOYSA-N
- CAS Registry Number: 12018-00-7
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Reaction thermochemistry 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.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 188.28 | kJ/mol | Review | Chase, 1998 | Data last reviewed in December, 1973 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 239.26 | J/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1973 |
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) | 298. to 1400. | 1400. to 6000. |
---|---|---|
A | 27.49080 | 40.66358 |
B | 21.35694 | -2.222764 |
C | -16.56504 | 0.679749 |
D | 4.565706 | -0.045004 |
E | -0.106995 | -2.753395 |
F | 178.9124 | 170.3436 |
G | 266.2589 | 281.4811 |
H | 188.2800 | 188.2800 |
Reference | Chase, 1998 | Chase, 1998 |
Comment | Data last reviewed in December, 1973 | Data last reviewed in December, 1973 |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry 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 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
(CAS Reg. No. 53293-42-8 • 4294967295) +
= CAS Reg. No. 53293-42-8
By formula: (CAS Reg. No. 53293-42-8 • 4294967295CrO) + CrO = CAS Reg. No. 53293-42-8
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 617. ± 36. | kJ/mol | N/A | Wenthold, Jonas, et al., 1997 | gas phase |
Constants of diatomic molecules
Go To: Top, Gas phase thermochemistry 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 by: Klaus P. Huber and Gerhard H. Herzberg
Data collected through December, 1974
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 |
---|---|---|---|---|---|---|---|---|---|---|---|---|
B 5Π | 16586 1 | 750.5 H | 9.4 | 0.4874 | 0.0044 | 1.703 | B → X R | 16487.6 | ||||
↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964 | ||||||||||||
750.5 H | 9.4 | 0.4801 | 0.0048 | 1.703 | B → X R | 16501.2 | ||||||
↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964 | ||||||||||||
750.5 H | 9.4 | 0.4751 | 0.0057 | 1.703 | B → X R | 16511.3 | ||||||
↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964 | ||||||||||||
750.5 H | 9.4 | 0.4735 | 0.0070 | 1.703 | B → X R | 16519.4 | ||||||
↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964 | ||||||||||||
750.5 H | 9.4 | 0.4675 | 0.0050 | 1.703 | B → X R | 16515.2 | ||||||
↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964 | ||||||||||||
State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
(11117) | ||||||||||||
↳missing citation | ||||||||||||
X 5Π | 0 2 | 898.4 H | 6.75 | 0.5410 | 0.0049 | 1.615 | ||||||
0 2 | 898.4 H | 6.75 | 0.5348 | 0.0049 | 1.615 | |||||||
0 2 | 898.4 H | 6.75 | 0.5284 | 0.0050 | 1.615 | |||||||
0 2 | 898.4 H | 6.75 | 0.5233 | 0.0036 | 1.615 | |||||||
0 2 | 898.4 H | 6.75 | 0.5231 | 0.0070 | 1.615 |
Notes
1 | |A| ~100. |
2 | |A| ~110. Not certain that this is the ground state. |
3 | Thermochemical value (mass-spectrom.) Grimley, Burns, et al., 1961. |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry 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]
Wenthold, Jonas, et al., 1997
Wenthold, P.G.; Jonas, K.-L.; Lineberger, W.C.,
Ultraviolet Photoelectron Spectroscopy of the Chromium Dioxide Negative Ion,
J. Chem. Phys., 1997, 106, 23, 9961, https://doi.org/10.1063/1.473840
. [all data]
Ferguson, 1932
Ferguson, W.F.C.,
The chromium oxide and the vanadium oxide band spectra,
Bur. Stand. J. Res. US, 1932, 8, 381. [all data]
Ghosh, 1932
Ghosh, C.,
Das bandenspektrum des chromoxyds,
Z. Phys., 1932, 78, 521. [all data]
Murthy and Nagaraj, 1964
Murthy, N.S.; Nagaraj, S.,
A note on the Franck-Condon factors and r-centroids of the CrO (A→X) band system,
Proc. Phys. Soc. London, 1964, 84, 827. [all data]
Grimley, Burns, et al., 1961
Grimley, R.T.; Burns, R.P.; Inghram, M.G.,
Thermodynamics of the vaporization of Cr2O3: dissociation energies of CrO, CrO2, and CrO3,
J. Chem. Phys., 1961, 34, 664. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Constants of diatomic molecules, References
- 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 ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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