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].

Dimethylsilane

Formula: CH3SiH2CH3 (g)
CAS RN: 1111-74-6
ATcT ID: 1111-74-6*0
SMILES: C[SiH2]C
InChI: InChI=1S/C2H8Si/c1-3-2/h3H2,1-2H3
InChIKey: UBHZUDXTHNMNLD-UHFFFAOYSA-N
Hills Formula: C2H8Si1

2D Image:

C[SiH2]C
Aliases: CH3SiH2CH3; Dimethylsilane; 2-Silapropane; (CH3)2SiH2; SiH2(CH3)2
Relative Molecular Mass: 60.1704 ± 0.0017

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
-66.8-88.2± 1.1kJ/mol

3D Image of CH3SiH2CH3 (g)

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Top contributors to the provenance of ΔfH° of CH3SiH2CH3 (g)

The 20 contributors listed below account only for 50.3% of the provenance of ΔfH° of CH3SiH2CH3 (g).
A total of 95 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
4.58538.1 Si (cr,l) + 2 F2 (g) → SiF4 (g) ΔrH°(298.15 K) = -385.98 ± 0.19 kcal/molWise 1963, Wise 1963, Wise 1962
3.98759.2 Si(CH3)4 (g) → Si (g) + 4 C (g) + 12 H (g) ΔrH°(0 K) = 1451.02 ± 1.60 kcal/molRuscic G4
3.98759.4 Si(CH3)4 (g) → Si (g) + 4 C (g) + 12 H (g) ΔrH°(0 K) = 1453.34 ± 1.50 (×1.067) kcal/molRuscic W1RO
3.48759.1 Si(CH3)4 (g) → Si (g) + 4 C (g) + 12 H (g) ΔrH°(0 K) = 1451.64 ± 1.72 kcal/molRuscic G3X
2.98718.4 CH3SiH3 (g) → SiH3SiH3 (g) CH3CH3 (g) ΔrH°(0 K) = 10.76 ± 1.2 kcal/molRuscic W1RO
2.88738.4 SiH(CH3)3 (g) → Si (g) + 3 C (g) + 10 H (g) ΔrH°(0 K) = 1165.30 ± 1.50 kcal/molRuscic W1RO
2.48718.2 CH3SiH3 (g) → SiH3SiH3 (g) CH3CH3 (g) ΔrH°(0 K) = 10.76 ± 1.3 kcal/molRuscic G4
2.48738.2 SiH(CH3)3 (g) → Si (g) + 3 C (g) + 10 H (g) ΔrH°(0 K) = 1163.11 ± 1.60 kcal/molRuscic G4
2.48631.1 SiH3SiH3 (g) → 2 Si (cr,l) + 3 H2 (g) ΔrH°(298.15 K) = -19.1 ± 0.6 (×1.61) kcal/molGunn 1961, est unc
2.38595.1 SiH4 (g) → Si (cr,l) + 2 H2 (g) ΔrH°(298.15 K) = -8.3 ± 0.5 kcal/molGunn 1961, Gurvich TPIS, est unc
2.28764.4 Si(CH3)3 (g) → Si (g) + 3 C (g) + 9 H (g) ΔrH°(0 K) = 1072.00 ± 1.50 kcal/molRuscic W1RO
2.18718.1 CH3SiH3 (g) → SiH3SiH3 (g) CH3CH3 (g) ΔrH°(0 K) = 10.66 ± 1.4 kcal/molRuscic G3X
2.18738.1 SiH(CH3)3 (g) → Si (g) + 3 C (g) + 10 H (g) ΔrH°(0 K) = 1163.50 ± 1.72 kcal/molRuscic G3X
2.08481.2 Si (cr,l) → Si (g) ΔrG°(1525 K) = 231.1 ± 2.0 kJ/molBatdorf 1959, 3rd Law
1.98764.2 Si(CH3)3 (g) → Si (g) + 3 C (g) + 9 H (g) ΔrH°(0 K) = 1070.89 ± 1.60 kcal/molRuscic G4
1.88759.3 Si(CH3)4 (g) → Si (g) + 4 C (g) + 12 H (g) ΔrH°(0 K) = 1449.49 ± 2.16 (×1.067) kcal/molRuscic CBS-n
1.8546.1 SiF4 (g) + 2 H2O (cr,l) → Si (cr,l) O2 (g) + 4 HF (aq, 5 H2O) ΔrH°(298.15 K) = 899.77 ± 1.20 kJ/molPaulechka 2020, Vorobev 1960, Hummel 1959, Johnson 1987, Good 1964, Good 1964, Johnson 1973
1.78764.1 Si(CH3)3 (g) → Si (g) + 3 C (g) + 9 H (g) ΔrH°(0 K) = 1070.39 ± 1.72 kcal/molRuscic G3X
1.68718.3 CH3SiH3 (g) → SiH3SiH3 (g) CH3CH3 (g) ΔrH°(0 K) = 11.43 ± 1.6 kcal/molRuscic CBS-n
1.48729.4 CH3SiH2CH3 (g) → Si (g) + 2 C (g) + 8 H (g) ΔrH°(0 K) = 877.68 ± 1.50 kcal/molRuscic W1RO

Top 10 species with enthalpies of formation correlated to the ΔfH° of CH3SiH2CH3 (g)

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
94.4 TrimethylsilaneSiH(CH3)3 (g)C[SiH](C)C-125.8-151.9± 1.5kJ/mol74.1970 ±
0.0025
993-07-7*0
86.2 TetramethylsilaneSi(CH3)4 (g)C[Si](C)(C)C-185.8-216.3± 1.9kJ/mol88.2236 ±
0.0033
75-76-3*0
84.8 MethylsilaneCH3SiH3 (g)C[SiH3]-9.83-26.00± 0.89kJ/mol46.14384 ±
0.00095
992-94-9*0
81.6 Trimethylsilylium[Si(CH3)3]+ (g)C[Si+](C)C655.4634.8± 1.9kJ/mol73.1885 ±
0.0025
28927-31-3*0
78.3 BromotrimethylsilaneSiBr(CH3)3 (g)C[Si](Br)(C)C-259.4-290.1± 2.0kJ/mol153.0931 ±
0.0027
2857-97-8*0
76.9 IodotrimethylsilaneSiI(CH3)3 (g)C[Si](I)(C)C-189.7-214.5± 2.1kJ/mol200.0935 ±
0.0025
16029-98-4*0
69.7 FluorotrimethylsilaneSiF(CH3)3 (g)C[Si](F)(C)C-547.2-570.8± 2.0kJ/mol92.1875 ±
0.0025
420-56-4*0
64.9 TrimethylsilylSi(CH3)3 (g)C[Si](C)C47.525.4± 1.9kJ/mol73.1891 ±
0.0025
16571-41-8*0
64.8 ChlorotrimethylsilaneSiCl(CH3)3 (g)C[Si](Cl)(C)C-326.3-349.5± 2.3kJ/mol108.6418 ±
0.0027
75-77-4*0
62.6 Trimethylsilanide[Si(CH3)3]- (g)C[Si-](C)C-42.0-65.5± 2.1kJ/mol73.1896 ±
0.0025
54711-92-1*0

Most Influential reactions involving CH3SiH2CH3 (g)

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
0.9848739.1 SiH(CH3)3 (g) CH3SiH3 (g) → 2 CH3SiH2CH3 (g) ΔrG°(398 K) = -1.38 ± 0.10 kJ/molDoncaster 1986, 3rd Law
0.8928760.1 Si(CH3)4 (g) CH3SiH2CH3 (g) → 2 SiH(CH3)3 (g) ΔrG°(398 K) = -2.87 ± 0.32 kJ/molDoncaster 1986, 3rd Law
0.3608730.1 CH3SiH2CH3 (g) SiH4 (g) → 2 CH3SiH3 (g) ΔrG°(333 K) = -0.06 ± 1.38 kJ/molRussell 1959, Doncaster 1986, 3rd Law, est unc
0.2578732.5 CH3CH2SiH3 (g) → CH3SiH2CH3 (g) ΔrH°(0 K) = -53.89 ± 3 kJ/molVuori 2022
0.0928732.4 CH3CH2SiH3 (g) → CH3SiH2CH3 (g) ΔrH°(0 K) = -12.86 ± 1.2 kcal/molRuscic W1RO
0.0788732.2 CH3CH2SiH3 (g) → CH3SiH2CH3 (g) ΔrH°(0 K) = -12.84 ± 1.3 kcal/molRuscic G4
0.0768730.6 CH3SiH2CH3 (g) SiH4 (g) → 2 CH3SiH3 (g) ΔrH°(0 K) = 3.46 ± 3 kJ/molVuori 2022
0.0678732.1 CH3CH2SiH3 (g) → CH3SiH2CH3 (g) ΔrH°(0 K) = -12.78 ± 1.4 kcal/molRuscic G3X
0.0528761.4 Si(CH3)4 (g) SiH4 (g) → 2 CH3SiH2CH3 (g) ΔrH°(0 K) = 2.51 ± 0.9 kcal/molRuscic W1RO
0.0518732.3 CH3CH2SiH3 (g) → CH3SiH2CH3 (g) ΔrH°(0 K) = -12.33 ± 1.6 kcal/molRuscic CBS-n
0.0488730.5 CH3SiH2CH3 (g) SiH4 (g) → 2 CH3SiH3 (g) ΔrH°(0 K) = 0.86 ± 0.9 kcal/molRuscic W1RO
0.0488760.2 Si(CH3)4 (g) CH3SiH2CH3 (g) → 2 SiH(CH3)3 (g) ΔrG°(333 K) = -2.54 ± 1.38 kJ/molRussell 1959, Doncaster 1986, 3rd Law, est unc
0.0428761.2 Si(CH3)4 (g) SiH4 (g) → 2 CH3SiH2CH3 (g) ΔrH°(0 K) = 3.01 ± 1.0 kcal/molRuscic G4
0.0398730.3 CH3SiH2CH3 (g) SiH4 (g) → 2 CH3SiH3 (g) ΔrH°(0 K) = 0.92 ± 1.0 kcal/molRuscic G4
0.0328730.2 CH3SiH2CH3 (g) SiH4 (g) → 2 CH3SiH3 (g) ΔrH°(0 K) = 1.05 ± 1.1 kcal/molRuscic G3X
0.0328761.1 Si(CH3)4 (g) SiH4 (g) → 2 CH3SiH2CH3 (g) ΔrH°(0 K) = 3.44 ± 1.1 (×1.044) kcal/molRuscic G3X
0.0258761.3 Si(CH3)4 (g) SiH4 (g) → 2 CH3SiH2CH3 (g) ΔrH°(0 K) = 3.09 ± 1.3 kcal/molRuscic CBS-n
0.0238730.4 CH3SiH2CH3 (g) SiH4 (g) → 2 CH3SiH3 (g) ΔrH°(0 K) = 0.93 ± 1.3 kcal/molRuscic CBS-n
0.0208729.4 CH3SiH2CH3 (g) → Si (g) + 2 C (g) + 8 H (g) ΔrH°(0 K) = 877.68 ± 1.50 kcal/molRuscic W1RO
0.0178729.2 CH3SiH2CH3 (g) → Si (g) + 2 C (g) + 8 H (g) ΔrH°(0 K) = 875.79 ± 1.60 kcal/molRuscic G4


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. 1.176 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.