Chromium,pentacarbonyl(1H-pyrazole-N2)-(oc-6-22)-
- Formula: C8H4CrN2O5
- Molecular weight: 260.1239
- CAS Registry Number: 71127-65-6
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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.
Data compiled by: José A. Martinho Simões
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -146.8 ± 1.6 | kcal/mol | Review | Martinho Simões | The enthalpy of formation relies on -217.1 ± 0.62 kcal/mol for the enthalpy of formation of Cr(CO)6(g) |
Condensed 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.
Data compiled by: José A. Martinho Simões
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°solid | -167.9 ± 1.6 | kcal/mol | Review | Martinho Simões | The enthalpy of formation relies on -217.1 ± 0.62 kcal/mol for the enthalpy of formation of Cr(CO)6(g) |
Phase change 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.
Data compiled as indicated in comments:
MS - José A. Martinho Simões
AC - William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔsubH° | 21.1 ± 0.43 | kcal/mol | DSC | Daamen, Ernsting, et al., 1979 | MS |
Enthalpy of sublimation
| ΔsubH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 21.1 ± 0.43 | 287. | ME | Daamen, Ernsting, et al., 1979, 2 | Based on data from 270. to 303. K.; AC |
References
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Martinho Simões
Martinho Simões, J.A.,
Private communication (see http://webbook.nist.gov/chemistry/om/). [all data]
Daamen, Ernsting, et al., 1979
Daamen, H.; Ernsting, J.M.; Oskam, A.,
Thermochim. Acta, 1979, 33, 217. [all data]
Daamen, Ernsting, et al., 1979, 2
Daamen, H.; Ernsting, J.M.; Oskam, A.,
Vapour pressure measurements on M(CO)5L (M = Cr, Mo, W; L = piperidine, pyridine, pyrazine, pyrazole, thiazole),
Thermochimica Acta, 1979, 33, 217-223, https://doi.org/10.1016/0040-6031(79)87044-6
. [all data]
Notes
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- Symbols used in this document:
ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔsubH Enthalpy of sublimation ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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