Magnesium, bis(η5-2,4-cyclopentadien-1-yl)-
- Formula: C10H10Mg
- Molecular weight: 154.4914
- IUPAC Standard InChI: InChI=1S/2C5H5.Mg/c2*1-2-4-5-3-1;/h2*1-5H;
- IUPAC Standard InChIKey: USZGMDQWECZTIQ-UHFFFAOYSA-N
- CAS Registry Number: 1284-72-6
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Dicyclopentadienyl magnesium; Bis(cyclopentadienyl)magnesium; Magnesocene; wm
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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 | 137.5 ± 4.4 | kJ/mol | Review | Martinho Simões | Selected data |
| ΔfH°gas | 145.2 ± 3.3 | kJ/mol | Review | Martinho Simões |
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 | 69.3 ± 4.2 | kJ/mol | Review | Martinho Simões | Selected data |
| ΔfH°solid | 77. ± 3. | kJ/mol | CC-SB | Chipperfield, Sneyd, et al., 1979 | Value corrected based on a set of ancillary data by J.A. Martinho Simões; The enthalpy of combustion is not reported in Chipperfield, Sneyd, et al., 1979 |
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 |
|---|---|---|---|---|---|
| ΔsubH° | 68.2 ± 1.3 | kJ/mol | N/A | Pilcher and Skinner, 1983 | See also Hull, Reid, et al., 1967 and Turnbull, 1967.; AC |
| ΔsubH° | 68.2 ± 1.3 | kJ/mol | RSC | Hull, Reid, et al., 1967, 2 | MS |
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
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
2 (l) +
(cr) =
(cr) +
(g)
By formula: 2C5H6 (l) + Mg (cr) = C10H10Mg (cr) + H2 (g)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -142.5 ± 2.9 | kJ/mol | RSC | Hull, Reid, et al., 1967, 2 | Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970. |
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 by: Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 8.0 ± 0.1 | EI | Begun and Compton, 1973 | |
| 8.11 | PE | Evans, Green, et al., 1972 | Vertical value |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| C5H5Mg+ | 11.0 ± 0.2 | ? | EI | Begun and Compton, 1973 | |
| Mg+ | 13.9 ± 0.5 | ? | EI | Begun and Compton, 1973 |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, 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]
Chipperfield, Sneyd, et al., 1979
Chipperfield, J.R.; Sneyd, J.C.R.; Webster, D.E.,
J. Organometal. Chem., 1979, 178, 177. [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]
Hull, Reid, et al., 1967
Hull, H.S.; Reid, Allen Forrest; Turnbull, Alan G.,
Heat of formation and bond energy of bis(cyclopentadienyl)magnesium,
Inorg. Chem., 1967, 6, 4, 805-807, https://doi.org/10.1021/ic50050a032
. [all data]
Turnbull, 1967
Turnbull, AG,
Thermochemistry of biscyclopentsdienyl metal compounds,
Aust. J. Chem., 1967, 20, 12, 2757-621, https://doi.org/10.1071/CH9672757
. [all data]
Hull, Reid, et al., 1967, 2
Hull, H.S.; Reid, A.F.; Turnbull, A.G.,
Inorg. Chem., 1967, 6, 805. [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]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds
in Academic Press, New York, 1970. [all data]
Begun and Compton, 1973
Begun, G.M.; Compton, R.N.,
Electron impact ionization studies of ferrocene, cobaltocene, nickelocene, and magnesocene,
J. Chem. Phys., 1973, 58, 2271. [all data]
Evans, Green, et al., 1972
Evans, S.; Green, M.L.H.; Jewitt, B.; Orchard, A.F.; Pygall, C.F.,
Electronic structure of metal complexes containing π-cyclopentadienyl and related ligands,
J. Chem. Soc. Faraday Trans. 2, 1972, 68, 1847. [all data]
Notes
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- Symbols used in this document:
AE Appearance energy ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔrH° Enthalpy of reaction at standard conditions ΔsubH° Enthalpy of sublimation at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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