Selected ATcT [1, 2] enthalpy of formation based on version 1.176 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.172 to include species related to Criegee intermediates that are involved in several ongoing studies[4].

1-Hydroperoxyethylium

Formula: [CH3CHOOH]+ (g, trans singlet)

CAS RN: *126898-98-4

ATcT ID: *126898-98-4*21

SMILES: C[CH+]OO

InChI: InChI=1S/C2H5O2/c1-2-4-3/h2-3H,1H3/q+1

InChIKey: HOOOUYZWAHEWIO-UHFFFAOYSA-N

InChI: InChI=1S/C2H4O2/c1-2-4-3/h2H,1H3/p+1

InChIKey: OATRENYCMVOEIQ-UHFFFAOYSA-O

Hills Formula: C2H5O2+

2D Image:

Aliases: [CH3CHOOH]+; 1-Hydroperoxyethylium; 1-Hydroperoxyeth-1-ylium; 1-Ethylidenedioxidan-1-ium; CH3CHOOH+

Relative Molecular Mass: 61.0594 ± 0.0017

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
690.7	675.0	± 1.5	kJ/mol

3D Image of [CH3CHOOH]+ (g, trans singlet)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of [CH3CHOOH]+ (g, trans singlet)

The 20 contributors listed below account only for 51.7% of the provenance of Δ_fH° of [CH3CHOOH]+ (g, trans singlet).
A total of 85 contributors would be needed to account for 90% of the provenance.

Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.

Contribution (%)	TN ID	Reaction	Measured Quantity	Reference
9.9	4698.5	CH3CH2OOH (g) → [CH3CHOOH]+ (g, trans singlet) + H (g)	Δ_rH°(0 K) = 10.869 ± 0.040 eV	Ruscic W1RO
3.1	4680.5	CH3CHOOH (g) → [CH3CHOOH]+ (g, trans singlet)	Δ_rH°(0 K) = 6.742 ± 0.040 eV	Ruscic W1RO
3.0	4699.5	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = 0.011 ± 0.037 eV	Ruscic W1RO
2.9	4698.2	CH3CH2OOH (g) → [CH3CHOOH]+ (g, trans singlet) + H (g)	Δ_rH°(0 K) = 10.871 ± 0.073 eV	Ruscic G4
2.8	4698.4	CH3CH2OOH (g) → [CH3CHOOH]+ (g, trans singlet) + H (g)	Δ_rH°(0 K) = 10.868 ± 0.075 eV	Ruscic CBS-n
2.8	4652.5	CH3CH2OO (g, gauche) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 10.027 ± 0.040 eV	Ruscic W1RO
2.6	4699.2	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = -0.001 ± 0.040 eV	Ruscic G4
2.6	4699.4	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = 0.031 ± 0.040 eV	Ruscic CBS-n
2.6	4699.1	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = 0.006 ± 0.040 eV	Ruscic G3X
2.2	4694.5	[CH3CHOOH]+ (g, trans singlet) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 65.21 ± 0.9 kcal/mol	Ruscic W1RO
2.2	4699.3	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = 0.004 ± 0.043 eV	Ruscic CBS-n
1.8	4694.2	[CH3CHOOH]+ (g, trans singlet) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 64.18 ± 1.0 kcal/mol	Ruscic G4
1.8	4694.4	[CH3CHOOH]+ (g, trans singlet) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 65.19 ± 1.0 kcal/mol	Ruscic CBS-n
1.8	4698.1	CH3CH2OOH (g) → [CH3CHOOH]+ (g, trans singlet) + H (g)	Δ_rH°(0 K) = 10.876 ± 0.093 eV	Ruscic G3X
1.7	4692.4	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, trans triplet)	Δ_rH°(0 K) = 12761 ± 420 cm-1	Ruscic W1RO
1.6	4698.3	CH3CH2OOH (g) → [CH3CHOOH]+ (g, trans singlet) + H (g)	Δ_rH°(0 K) = 10.900 ± 0.099 eV	Ruscic CBS-n
1.5	4694.1	[CH3CHOOH]+ (g, trans singlet) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 64.51 ± 1.1 kcal/mol	Ruscic G3X
1.5	4692.2	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, trans triplet)	Δ_rH°(0 K) = 12338 ± 450 cm-1	Ruscic G4
1.2	4692.1	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, trans triplet)	Δ_rH°(0 K) = 12294 ± 490 cm-1	Ruscic G3X
1.2	4641.6	CH3CH2OOH (g) → 2 C (g) + 6 H (g) + 2 O (g)	Δ_rH°(0 K) = 3354.43 ± 2. kJ/mol	Welch 2019, Welch 2018

Top 10 species with enthalpies of formation correlated to the Δ_fH° of [CH3CHOOH]+ (g, trans singlet)

Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.

Correlation Coefficent (%)	Species Name	Formula	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
100.0	1-Hydroperoxyethylium	[CH3CHOOH]+ (g, singlet)	690.7	675.8	± 1.5	kJ/mol	61.0594 ± 0.0017	126898-98-42
100.0	1-Hydroperoxyethylium	[CH3CHOOH]+ (g)	690.7	675.8	± 1.5	kJ/mol	61.0594 ± 0.0017	126898-98-40
64.9	1-Hydroperoxyethylium	[CH3CHOOH]+ (g, cis singlet)	692.0	676.3	± 2.3	kJ/mol	61.0594 ± 0.0017	126898-98-422
60.3	1-Hydroperoxyethyl	CH3CHOOH (g)	39.7	26.1	± 1.3	kJ/mol	61.0599 ± 0.0017	126898-98-4*0
54.2	Ethoxyoxoniumylidene	[CH3CH2OO]+ (g, singlet)	962.5	947.8	± 1.7	kJ/mol	61.0594 ± 0.0017	268728-77-4*2
54.2	Ethoxyoxoniumylidene	[CH3CH2OO]+ (g, cis singlet)	962.5	946.1	± 1.7	kJ/mol	61.0594 ± 0.0017	268728-77-4*22
46.8	1-Hydroperoxyethylium	[CH3CHOOH]+ (g, trans triplet)	841.5	829.5	± 1.7	kJ/mol	61.0594 ± 0.0017	126898-98-411
46.8	1-Hydroperoxyethylium	[CH3CHOOH]+ (g, triplet)	841.5	830.3	± 1.7	kJ/mol	61.0594 ± 0.0017	126898-98-41
42.8	Ethoxyoxoniumylidene	[CH3CH2OO]+ (g, triplet)	923.9	911.6	± 1.5	kJ/mol	61.0594 ± 0.0017	268728-77-4*1
42.8	Ethoxyoxoniumylidene	[CH3CH2OO]+ (g)	923.9	911.6	± 1.5	kJ/mol	61.0594 ± 0.0017	268728-77-4*0

Most Influential reactions involving [CH3CHOOH]+ (g, trans singlet)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Influence Coefficient	TN ID	Reaction	Measured Quantity	Reference
1.000	4689.1	[CH3CHOOH]+ (g, singlet) → [CH3CHOOH]+ (g, trans singlet)	Δ_rH°(0 K) = 0 ± 0 cm-1	Ruscic W1RO, Ruscic G4, Ruscic CBS-n
0.221	4691.5	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, cis singlet)	Δ_rH°(0 K) = 111 ± 300 cm-1	Ruscic W1RO
0.207	4691.4	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, cis singlet)	Δ_rH°(0 K) = 119 ± 310 cm-1	Ruscic CBS-n
0.207	4691.2	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, cis singlet)	Δ_rH°(0 K) = 113 ± 310 cm-1	Ruscic G4
0.200	4691.1	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, cis singlet)	Δ_rH°(0 K) = 81 ± 315 cm-1	Ruscic G3X
0.162	4691.3	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, cis singlet)	Δ_rH°(0 K) = 117 ± 350 cm-1	Ruscic CBS-n
0.151	4694.5	[CH3CHOOH]+ (g, trans singlet) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 65.21 ± 0.9 kcal/mol	Ruscic W1RO
0.125	4698.5	CH3CH2OOH (g) → [CH3CHOOH]+ (g, trans singlet) + H (g)	Δ_rH°(0 K) = 10.869 ± 0.040 eV	Ruscic W1RO
0.122	4694.2	[CH3CHOOH]+ (g, trans singlet) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 64.18 ± 1.0 kcal/mol	Ruscic G4
0.122	4694.4	[CH3CHOOH]+ (g, trans singlet) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 65.19 ± 1.0 kcal/mol	Ruscic CBS-n
0.116	4699.5	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = 0.011 ± 0.037 eV	Ruscic W1RO
0.102	4692.4	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, trans triplet)	Δ_rH°(0 K) = 12761 ± 420 cm-1	Ruscic W1RO
0.101	4694.1	[CH3CHOOH]+ (g, trans singlet) → [CH3CH2OO]+ (g, cis singlet)	Δ_rH°(0 K) = 64.51 ± 1.1 kcal/mol	Ruscic G3X
0.099	4699.4	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = 0.031 ± 0.040 eV	Ruscic CBS-n
0.099	4699.2	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = -0.001 ± 0.040 eV	Ruscic G4
0.099	4699.1	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = 0.006 ± 0.040 eV	Ruscic G3X
0.098	4680.5	CH3CHOOH (g) → [CH3CHOOH]+ (g, trans singlet)	Δ_rH°(0 K) = 6.742 ± 0.040 eV	Ruscic W1RO
0.089	4692.2	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, trans triplet)	Δ_rH°(0 K) = 12338 ± 450 cm-1	Ruscic G4
0.085	4699.3	[CH3CHOOH]+ (g, trans singlet) + CH3CHOH (g, gauche-anti) → CH3CHOOH (g) + [CH3CHOH]+ (g, anti)	Δ_rH°(0 K) = 0.004 ± 0.043 eV	Ruscic CBS-n
0.075	4692.1	[CH3CHOOH]+ (g, trans singlet) → [CH3CHOOH]+ (g, trans triplet)	Δ_rH°(0 K) = 12294 ± 490 cm-1	Ruscic G3X

References

1		B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner, Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited. J. Phys. Chem. A 108, 9979-9997 (2004) [DOI: 10.1021/jp047912y]
2		B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner, Active Thermochemical Tables: Thermochemistry for the 21^st Century. J. Phys. Conf. Ser. 16, 561-570 (2005) [DOI: 10.1088/1742-6596/16/1/078]
3		B. Ruscic and D. H. Bross, Active Thermochemical Tables (ATcT) values based on ver. 1.176 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		T. L. Nguyen et al, ongoing studies (2024)
5		B. Ruscic, Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables. Int. J. Quantum Chem. 114, 1097-1101 (2014) [DOI: 10.1002/qua.24605]
6		B. Ruscic and D. H. Bross, Thermochemistry Computer Aided Chem. Eng. 45, 3-114 (2019) [DOI: 10.1016/B978-0-444-64087-1.00001-2]

Formula

The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

Uncertainties

The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.000₅ kJ/mol.

Website Functionality Credits

The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.

Acknowledgement

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.