Dicobalt octacarbonyl


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
Δfgas-1183.0 ± 9.1kJ/molReviewMartinho Simões 
Δfgas-1185.2 ± 9.4kJ/molReviewMartinho Simões 
Δfgas-1184.1 ± 6.9kJ/molReviewMartinho SimõesSelected data. Average of the values from Connor, Skinner, et al., 1973 and Gardner, Cartner, et al., 1975.

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
Δfsolid-1248.2 ± 8.5kJ/molReviewMartinho Simões 
Δfsolid-1250.4 ± 8.8kJ/molReviewMartinho Simões 
Δfsolid-1249.3 ± 6.1kJ/molReviewMartinho SimõesSelected data. Average of the values from Connor, Skinner, et al., 1973 and Gardner, Cartner, et al., 1975.

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:
AC - William E. Acree, Jr., James S. Chickos
MS - José A. Martinho Simões

Quantity Value Units Method Reference Comment
Δsub65.2 ± 3.3kJ/molN/APilcher and Skinner, 1983See also Cardner, Gartner, et al., 1975.; AC
Δsub65.2 ± 3.3kJ/molTD-HFCGardner, Cartner, et al., 1975Another value for the enthalpy of sublimation has been reported: 75.3±6.3 Cartner, Robinson, et al., 1973.; MS

Enthalpy of sublimation

ΔsubH (kJ/mol) Temperature (K) Method Reference Comment
84.3 ± 0.5271.TEGarner, Chandra, et al., 1995Based on data from 264. - 278. K.; AC
103.8301.5AStephenson and Malanowski, 1987Based on data from 288. - 315. K. See also Baev, 1968.; AC
75.3 ± 6.3207. - 287.EMCartner, Robinson, et al., 1973, 2AC

Reaction 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

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Individual Reactions

Dicobalt octacarbonyl (solution) + Hydrogen (solution) = 2Cobalt, tetracarbonylhydro- (solution)

By formula: C8Co2O8 (solution) + H2 (solution) = 2C4HCoO4 (solution)

Quantity Value Units Method Reference Comment
Δr19.7 ± 0.8kJ/molEqSRathke, Klingler, et al., 1992solvent: Supercritical carbon dioxide; Temperature range: 333-453 K. The results corrected for 1 atm pressure of H2 are 16.7 kJ/mol and -17.6 J/(mol K) Rathke, Klingler, et al., 1992
Δr13.0 ± 0.9kJ/molEqSBor, 1986solvent: n-Hexane; Temperature range: ca. 300-420 K
Δr26.4kJ/molKinSAlemdaroglu, Penninger, et al., 1976solvent: n-Heptane; The reaction enthalpy relies on the experimental values for the forward and reverse activation enthalpies, 72.4 and 46.0 kJ/mol, respectively Alemdaroglu, Penninger, et al., 1976. A rather different value has, however, been reported for the activation enthalpy of the forward reaction, 104.6 kJ/mol Ungváry, 1972
Δr27.6kJ/molEqSAlemdaroglu, Penninger, et al., 1976solvent: n-Heptane; Temperature range: 353-428 K
Δr13.4kJ/molEqSUngváry, 1972solvent: n-Heptane; Temperature range: 307-428 K. The results corrected for 1 atm pressure of H2 are 18.0 kJ/mol and -10.9 J/(mol K) Rathke, Klingler, et al., 1992

Dicobalt octacarbonyl (g) = 2Cobalt, tetracarbonyl (g)

By formula: C8Co2O8 (g) = 2C4CoO4 (g)

Quantity Value Units Method Reference Comment
Δr64.kJ/molESTConnor, 1977Please also see Pilcher and Skinner, 1982 and Martinho Simões and Beauchamp, 1990. The enthalpy of formation relies on -1184.1 ± 6.9 kJ/mol for the enthalpy of formation of Co2(CO)8(g).
Δr60. ± 13.kJ/molEG/EIMSBidinosti and McIntyre, 1970The reaction enthalpy includes an estimated correction to 298 K. A value of 60.7 ± 8.4 kJ/mol was reported at an average temperature of 330 K Bidinosti and McIntyre, 1970.

Dicobalt octacarbonyl (solution) = C7Co2O7 (solution) + Carbon monoxide (solution)

By formula: C8Co2O8 (solution) = C7Co2O7 (solution) + CO (solution)

Quantity Value Units Method Reference Comment
Δr92.7kJ/molKinSUngváry and Markó, 1974solvent: Heptane; Temperature range: 298-328 K
Δr87.9kJ/molKinSUngváry, 1972solvent: Heptane; Temperature range: 307-337 K

0.5Dicobalt octacarbonyl (solution) + sodium (cr) = C4CoNaO4 (solution)

By formula: 0.5C8Co2O8 (solution) + Na (cr) = C4CoNaO4 (solution)

Quantity Value Units Method Reference Comment
Δr-318. ± 11.kJ/molRSCKiss, Nolan, et al., 1994solvent: Tetrahydrofuran; The reaction enthalpy was calculated from the enthalpies of the following reactions: 0.5Co2(CO)8(solution) + (Na)(Ph2CO)(solution) = (Na)[Co(CO)4](solution) + Ph2CO(solution), -157. ± 11. kJ/mol, and Ph2CO(solution) + Na(cr) = (Na)(Ph2CO)(solution), -161.1 ± 2.5 kJ/mol Kiss, Nolan, et al., 1994.

Dimanganese decacarbonyl (solution) + Dicobalt octacarbonyl (solution) = 2C9CoMnO9 (solution)

By formula: C10Mn2O10 (solution) + C8Co2O8 (solution) = 2C9CoMnO9 (solution)

Quantity Value Units Method Reference Comment
Δr3.3 ± 1.3kJ/molEqSKlingler R.J. and Rathke, 1992solvent: Supercritical carbon dioxide; Temperature range: 353-453 K

2Dicobalt octacarbonyl (solution) = C12Co4O12 (solution) + 4Carbon monoxide (solution)

By formula: 2C8Co2O8 (solution) = C12Co4O12 (solution) + 4CO (solution)

Quantity Value Units Method Reference Comment
Δr123.4 ± 2.1kJ/molEqSBor and Dietler, 1980solvent: Hexane; Temperature range: 378-418 K

C13H10NaO (solution) + 0.5Dicobalt octacarbonyl (solution) = C4CoNaO4 (solution) + Benzophenone (solution)

By formula: C13H10NaO (solution) + 0.5C8Co2O8 (solution) = C4CoNaO4 (solution) + C13H10O (solution)

Quantity Value Units Method Reference Comment
Δr-157. ± 11.kJ/molRSCKiss, Nolan, et al., 1994solvent: Tetrahydrofuran

Dicobalt octacarbonyl (cr) = 8Carbon monoxide (g) + 2cobalt (cr)

By formula: C8Co2O8 (cr) = 8CO (g) + 2Co (cr)

Quantity Value Units Method Reference Comment
Δr364.0 ± 8.4kJ/molTD-HFCConnor, Skinner, et al., 1973Please also see Pedley and Rylance, 1977.

Gas phase ion energetics 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:
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Ionization energy determinations

IE (eV) Method Reference Comment
8.3 ± 0.1EIBidinosti and McIntyre, 1970RDSH
8.12 ± 0.22EIWinters and Kiser, 1965RDSH

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
CoCO+14.4 ± 0.5?EIWinters and Kiser, 1965RDSH
Co2CO+16.7 ± 0.37COEIWinters and Kiser, 1965RDSH
CoC2O2+12.7 ± 0.4?EIWinters and Kiser, 1965RDSH
Co2C2O2+14.7 ± 0.56COEIWinters and Kiser, 1965RDSH
CoC3O3+10.9 ± 0.3?EIWinters and Kiser, 1965RDSH
CoC4O4+8.8 ± 0.1?EIBidinosti and McIntyre, 1967RDSH
Co2C4O4+12.2 ± 0.34COEIWinters and Kiser, 1965RDSH
Co2C5O5+10.1 ± 0.43COEIWinters and Kiser, 1965RDSH
Co2C6O6+9.4 ± 0.32COEIWinters and Kiser, 1965RDSH
Co2C7O7+8.6 ± 0.3COEIWinters and Kiser, 1965RDSH
Co+16.9 ± 0.4?EIWinters and Kiser, 1965RDSH
Co2+17.8 ± 0.48COEIWinters and Kiser, 1965RDSH

Mass spectrum (electron ionization)

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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: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Origin Chemical Concepts
NIST MS number 154491

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References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Mass spectrum (electron ionization), Notes

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]

Connor, Skinner, et al., 1973
Connor, J.A.; Skinner, H.A.; Virmani, Y., High temperature microcalorimetric studies of the thermal decomposition and iodination of polynuclear carbonyls of Fe, Co, Ru, Rh, Re, Os and Ir, Faraday Symp. Chem. Soc., 1973, 8, 18, https://doi.org/10.1039/fs9730800018 . [all data]

Gardner, Cartner, et al., 1975
Gardner, P.J.; Cartner, A.; Cunninghame, R.G.; Robinson, B.H., J. Chem. Soc., Dalton Trans., 1975, 2582.. [all data]

Pilcher and Skinner, 1983
Pilcher, G.; Skinner, H.A., Thermochemistry of organometallic compounds, 1983, 43-90, https://doi.org/10.1002/9780470771686.ch2 . [all data]

Cardner, Gartner, et al., 1975
Cardner, Peter J.; Gartner, Anthony; Cunninghame, Robert G.; Robinson, Brian H., Bond energies in dicobalt octacarbonyl and bromo- and chloro-methylidynetricobalt enneacarbonyls, J. Chem. Soc., Dalton Trans., 1975, 23, 2582, https://doi.org/10.1039/dt9750002582 . [all data]

Cartner, Robinson, et al., 1973
Cartner, A.; Robinson, B.; Gardner, P.J., J. Chem. Soc., Chem. Commun., 1973, 317.. [all data]

Garner, Chandra, et al., 1995
Garner, M.L.; Chandra, D.; Lau, K.H., Low-temperature vapor pressures of W-, Cr-, and Co-carbonyls, JPE, 1995, 16, 1, 24-29, https://doi.org/10.1007/BF02646245 . [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

Baev, 1968
Baev, A.K., Vestsi Akad. Navak BSSR, Ser. Khim. Navuk, 1968, 4, 76. [all data]

Cartner, Robinson, et al., 1973, 2
Cartner, Anthony; Robinson, Brian; Gardner, Peter J., Heat of formation of dicobalt octacarbonyl and the metal?carbon monoxide bond strength in carbonyls, J. Chem. Soc., Chem. Commun., 1973, 9, 317b, https://doi.org/10.1039/c3973000317b . [all data]

Rathke, Klingler, et al., 1992
Rathke, J.W.; Klingler, R.J.; Krause, T.R., Organometallics, 1992, 11, 585. [all data]

Bor, 1986
Bor, G., Pure & Appl. Chem., 1986, 58, 543. [all data]

Alemdaroglu, Penninger, et al., 1976
Alemdaroglu, N.H.; Penninger, J.M.L.; Oltay, E., Monatsh. Chem., 1976, 107, 1043. [all data]

Ungváry, 1972
Ungváry, F., J. Organometal. Chem., 1972, 36, 363. [all data]

Connor, 1977
Connor, J.A., Top. Curr. Chem., 1977, 71, 71. [all data]

Pilcher and Skinner, 1982
Pilcher, G.; Skinner, H.A., In The Chemistry of the Metal-Carbon Bond Wiley: New York, Hartley, F. R.; Patai, S., ed(s)., 1982. [all data]

Martinho Simões and Beauchamp, 1990
Martinho Simões, J.A.; Beauchamp, J.L., Chem. Rev., 1990, 90, 629. [all data]

Bidinosti and McIntyre, 1970
Bidinosti, D.R.; McIntyre, N.S., Mass spectrometric study of the thermal decomposition of dimanganese decacarbonyl and dicobalt octacarbonyl, Can. J. Chem., 1970, 48, 593. [all data]

Ungváry and Markó, 1974
Ungváry, F.; Markó, L., J. Organometal. Chem., 1974, 71, 283. [all data]

Kiss, Nolan, et al., 1994
Kiss, G.; Nolan, S.P.; Hoff, C.D., Inorg. Chim. Acta, 1994, 227, 285. [all data]

Klingler R.J. and Rathke, 1992
Klingler R.J.; Rathke, J.W., Inorg. Chem., 1992, 31, 804. [all data]

Bor and Dietler, 1980
Bor, G.; Dietler, U.K., J. Organometal. Chem., 1980, 191, 295. [all data]

Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J., Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]

Winters and Kiser, 1965
Winters, R.E.; Kiser, R.W., Ions produced by electron impact with the dimetallic carbonyls of cobalt and manganese, J. Phys. Chem., 1965, 69, 1618. [all data]

Bidinosti and McIntyre, 1967
Bidinosti, D.R.; McIntyre, N.S., The metal-metal bond dissociation energy in cobalt octacarbonyl, Chem. Commun., 1967, 1. [all data]


Notes

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