Selected ATcT [1, 2] enthalpy of formation based on version 1.124 of the Thermochemical Network [3]

This version of ATcT results was generated by additional expansion of version 1.122x [4] to include additional information relevant to the study of thermophysical and thermochemical properties of CH2 and CH3 using nonrigid rotor anharmonic oscillator (NRRAO) partition functions [5], the development and benchmarking of a state-of-the-art computational approach that aims to reproduce total atomization energies of small molecules within 10–15 cm-1 [6], as well as the study of the reversible reaction C2H3 + H2 ⇌ C2H4 + H ⇌ C2H5 [7]

Methoxymethylene

Formula: CH3OCH (g, gauche triplet)
CAS RN: 19527-10-7
ATcT ID: 19527-10-7*1
SMILES: CO[CH]
InChI: InChI=1S/C2H4O/c1-3-2/h1H,2H3
InChIKey: QJVFBSULGFNYKF-UHFFFAOYSA-N
Hills Formula: C2H4O1

2D Image:

CO[CH]
Aliases: CH3OCH; Methoxymethylene; Methoxycarbene
Relative Molecular Mass: 44.0526 ± 0.0017

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
245.3235.8± 1.4kJ/mol

3D Image of CH3OCH (g, gauche triplet)

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Top contributors to the provenance of ΔfH° of CH3OCH (g, gauche triplet)

The 14 contributors listed below account for 90.3% of the provenance of ΔfH° of CH3OCH (g, gauche triplet).

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
13.74006.5 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 10.86 ± 0.85 kcal/molRuscic W1RO
12.24006.2 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 11.19 ± 0.90 kcal/molRuscic G4
12.24006.4 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 11.76 ± 0.90 kcal/molRuscic CBS-n
12.24006.1 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 10.30 ± 0.90 kcal/molRuscic G3X
9.94006.3 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 11.04 ± 1.0 kcal/molRuscic CBS-n
5.13977.7 CH3COH (g, anti singlet) → CH3COH (g, gauche triplet) ΔrH°(0 K) = 30.64 ± 0.50 kcal/molSchreiner 2011, est unc
4.23994.5 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.88 ± 0.85 kcal/molRuscic W1RO
3.83994.2 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.67 ± 0.90 kcal/molRuscic G4
3.83994.4 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.67 ± 0.90 kcal/molRuscic CBS-n
3.83994.1 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.63 ± 0.90 kcal/molRuscic G3X
3.03994.3 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.24 ± 1.0 kcal/molRuscic CBS-n
2.34159.1 CH3OCH3 (g) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (cr,l) ΔrH°(298.15 K) = -349.06 ± 0.11 kcal/molPilcher 1964
2.03977.6 CH3COH (g, anti singlet) → CH3COH (g, gauche triplet) ΔrH°(0 K) = 30.52 ± 0.80 kcal/molMatus 2006, est unc
1.33972.6 CH3COH (g, gauche triplet) → 2 C (g) O (g) + 4 H (g) ΔrH°(0 K) = 560.92 ± 1 kcal/molMatus 2006

Top 10 species with enthalpies of formation correlated to the ΔfH° of CH3OCH (g, gauche triplet)

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 Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass
ATcT ID
36.0 1-HydroxyethylideneCH3COH (g, gauche triplet)C[C]O184.9175.5± 1.4kJ/mol44.0526 ±
0.0017
30967-49-8*1
24.0 MethoxymethyleneCH3OCH (g, anti singlet)CO[CH]129.12118.59± 0.78kJ/mol44.0526 ±
0.0017
19527-10-7*21
24.0 MethoxymethyleneCH3OCH (g, singlet)CO[CH]129.12118.62± 0.78kJ/mol44.0526 ±
0.0017
19527-10-7*2
24.0 MethoxymethyleneCH3OCH (g)CO[CH]129.12118.62± 0.78kJ/mol44.0526 ±
0.0017
19527-10-7*0
20.3 MethoxymethaneCH3OCH3 (g)COC-166.51-184.01± 0.37kJ/mol46.0684 ±
0.0017
115-10-6*0
8.6 MethoxymethyleneCH3OCH (g, syn singlet)CO[CH]144.7134.3± 1.4kJ/mol44.0526 ±
0.0017
19527-10-7*22
5.9 MethoxyethaneCH3CH2OCH3 (g)CCOC-194.78-217.67± 0.57kJ/mol60.0950 ±
0.0025
540-67-0*0
5.7 MethyleneCH2 (g, triplet)[CH2]391.054391.600± 0.096kJ/mol14.02658 ±
0.00081
2465-56-7*1
5.7 MethyleneCH2 (g)[CH2]391.054391.600± 0.096kJ/mol14.02658 ±
0.00081
2465-56-7*0
5.6 1-HydroxyethylideneCH3COH (g, syn singlet)C[C]O69.9759.46± 0.86kJ/mol44.0526 ±
0.0017
30967-49-8*22

Most Influential reactions involving CH3OCH (g, gauche triplet)

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
0.1483994.5 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.88 ± 0.85 kcal/molRuscic W1RO
0.1484006.5 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 10.86 ± 0.85 kcal/molRuscic W1RO
0.1323994.4 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.67 ± 0.90 kcal/molRuscic CBS-n
0.1323994.2 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.67 ± 0.90 kcal/molRuscic G4
0.1323994.1 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.63 ± 0.90 kcal/molRuscic G3X
0.1324006.1 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 10.30 ± 0.90 kcal/molRuscic G3X
0.1324006.2 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 11.19 ± 0.90 kcal/molRuscic G4
0.1324006.4 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 11.76 ± 0.90 kcal/molRuscic CBS-n
0.1073994.3 CH3OCH (g, anti singlet) CH3COH (g, gauche triplet) → CH3OCH (g, gauche triplet) CH3COH (g, anti singlet) ΔrH°(0 K) = -2.24 ± 1.0 kcal/molRuscic CBS-n
0.1074006.3 CH3OCH (g, gauche triplet) CH4 (g) → CH3OCH3 (g) CH2 (g, triplet) ΔrH°(0 K) = 11.04 ± 1.0 kcal/molRuscic CBS-n


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 21st 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. 1.124 of the Thermochemical Network, Argonne National Laboratory, Lemont, Illinois 2022; available at ATcT.anl.gov
[DOI: 10.17038/CSE/1885923]
4   Y. Ren, L. Zhou, A. Mellouki, V. Daële, M. Idir, S. S. Brown, B. Ruscic, Robert S. Paton, M. R. McGillen, and A. R. Ravishankara,
Reactions of NO3 with Aromatic Aldehydes: Gas-Phase Kinetics and Insights into the Mechanism of the Reaction.
Atmos. Chem. Phys. 21, 13537-13551 (2021) [DOI: 10.5194/acp2021-228]
5   B. Ruscic and D. H. Bross,
Active Thermochemical Tables: The Thermophysical and Thermochemical Properties of Methyl, CH3, and Methylene, CH2, Corrected for Nonrigid Rotor and Anharmonic Oscillator Effects.
Mol. Phys. e1969046 (2021) [DOI: 10.1080/00268976.2021.1969046]
6   J. H. Thorpe, J. L. Kilburn, D. Feller, P. B. Changala, D. H. Bross, B. Ruscic, and J. F. Stanton,
Elaborated Thermochemical Treatment of HF, CO, N2, and H2O: Insight into HEAT and Its Extensions
J. Chem. Phys. 155, 184109 (2021) [DOI: 10.1063/5.0069322]
7   T. L. Nguyen, D. H. Bross, B. Ruscic, G. B. Ellison, and J. F. Stanton,
Mechanism, Thermochemistry, and Kinetics of the Reversible Reactions: C2H3 + H2 ⇌ C2H4 + H ⇌ C2H5.
Faraday Discuss. , (Advance Article) (2022) [DOI: 10.1039/D1FD00124H]
8   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]
9   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 [8,9]).
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.