1,2-Cyclobutanedione
- Formula: C4H4O2
- Molecular weight: 84.0734
- IUPAC Standard InChI: InChI=1S/C4H4O2/c5-3-1-2-4(3)6/h1-2H2
- IUPAC Standard InChIKey: QDMRCCGQLCIMLG-UHFFFAOYSA-N
- CAS Registry Number: 33689-28-0
- Chemical structure:
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Phase change data
Go To: Top, Gas phase ion energetics 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: William E. Acree, Jr., James S. Chickos
Enthalpy of sublimation
| ΔsubH (kJ/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 54.8 | 315. | Cao and Back, 1985 | Based on data from 295. - 335. K. |
Gas phase ion energetics data
Go To: Top, Phase change 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 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 |
|---|---|---|---|
| 9.60 | PE | Gleiter, Schang, et al., 1985 | Vertical value; LBLHLM |
| 9.61 | PE | Schang, Gleiter, et al., 1978 | Vertical value; LLK |
| 9.61 | PE | Gleiter, Schang, et al., 1978 | Vertical value; LLK |
References
Go To: Top, Phase change 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.
Cao and Back, 1985
Cao, J.-R.; Back, R.A.,
The thermal decomposition of cyclobutane-1,2-dione,
Can. J. Chem., 1985, 63, 11, 2945-2948, https://doi.org/10.1139/v85-488
. [all data]
Gleiter, Schang, et al., 1985
Gleiter, R.; Schang, P.; Bloch, M.; Heilbronner, E.; Bunzli, J.-C.; Frost, D.C.; Weiler, L.,
The He(Iα) PE spectra and electronic absorption spectra of hexafluorocyclobutanone and of tetrafluoro-1,2-cyclobutanedione,
Chem. Ber., 1985, 118, 2127. [all data]
Schang, Gleiter, et al., 1978
Schang, P.; Gleiter, R.; Rieker, A.,
The He(I) photoelectron spectrum of cyclobutene-1,2-dione and o-benzoquinone,
Ber. Bunsen-Ges. Phys. Chem., 1978, 82, 629. [all data]
Gleiter, Schang, et al., 1978
Gleiter, R.; Schang, P.; Seitz, G.,
Photoelectron spectra of cyclobutene-1,2-dione derivatives,
Chem. Phys. Lett., 1978, 55, 144. [all data]
Notes
Go To: Top, Phase change data, Gas phase ion energetics data, References
- Symbols used in this document:
ΔsubH Enthalpy of sublimation - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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