Selected ATcT [1, 2] enthalpy of formation based on version 1.148 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.140 to include species relevant to a recent study of the role of atmospheric methanediol[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:

Aliases: CH3SiH2CH3; Dimethylsilane; 2-Silapropane; (CH3)2SiH2; SiH2(CH3)2

Relative Molecular Mass: 60.1704 ± 0.0017

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
-66.7	-88.2	± 1.1	kJ/mol

3D Image of CH3SiH2CH3 (g)

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

The 20 contributors listed below account only for 50.3% of the provenance of Δ_fH° 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
4.5	8198.1	Si (cr,l) + 2 F2 (g) → SiF4 (g)	Δ_rH°(298.15 K) = -385.98 ± 0.19 kcal/mol	Wise 1963, Wise 1963, Wise 1962
3.9	8418.2	Si(CH3)4 (g) → Si (g) + 4 C (g) + 12 H (g)	Δ_rH°(0 K) = 1451.02 ± 1.60 kcal/mol	Ruscic G4
3.9	8418.4	Si(CH3)4 (g) → Si (g) + 4 C (g) + 12 H (g)	Δ_rH°(0 K) = 1453.34 ± 1.50 (×1.067) kcal/mol	Ruscic W1RO
3.4	8418.1	Si(CH3)4 (g) → Si (g) + 4 C (g) + 12 H (g)	Δ_rH°(0 K) = 1451.64 ± 1.72 kcal/mol	Ruscic G3X
2.9	8377.4	2 CH3SiH3 (g) → SiH3SiH3 (g) + CH3CH3 (g)	Δ_rH°(0 K) = 10.76 ± 1.2 kcal/mol	Ruscic W1RO
2.8	8397.4	SiH(CH3)3 (g) → Si (g) + 3 C (g) + 10 H (g)	Δ_rH°(0 K) = 1165.30 ± 1.50 kcal/mol	Ruscic W1RO
2.4	8377.2	2 CH3SiH3 (g) → SiH3SiH3 (g) + CH3CH3 (g)	Δ_rH°(0 K) = 10.76 ± 1.3 kcal/mol	Ruscic G4
2.4	8291.1	SiH3SiH3 (g) → 2 Si (cr,l) + 3 H2 (g)	Δ_rH°(298.15 K) = -19.1 ± 0.6 (×1.61) kcal/mol	Gunn 1961, est unc
2.4	8397.2	SiH(CH3)3 (g) → Si (g) + 3 C (g) + 10 H (g)	Δ_rH°(0 K) = 1163.11 ± 1.60 kcal/mol	Ruscic G4
2.3	8255.1	SiH4 (g) → Si (cr,l) + 2 H2 (g)	Δ_rH°(298.15 K) = -8.3 ± 0.5 kcal/mol	Gunn 1961, Gurvich TPIS, est unc
2.2	8423.4	Si(CH3)3 (g) → Si (g) + 3 C (g) + 9 H (g)	Δ_rH°(0 K) = 1072.00 ± 1.50 kcal/mol	Ruscic W1RO
2.1	8377.1	2 CH3SiH3 (g) → SiH3SiH3 (g) + CH3CH3 (g)	Δ_rH°(0 K) = 10.66 ± 1.4 kcal/mol	Ruscic G3X
2.1	8397.1	SiH(CH3)3 (g) → Si (g) + 3 C (g) + 10 H (g)	Δ_rH°(0 K) = 1163.50 ± 1.72 kcal/mol	Ruscic G3X
2.0	8141.2	Si (cr,l) → Si (g)	Δ_rG°(1525 K) = 231.1 ± 2.0 kJ/mol	Batdorf 1959, 3rd Law
1.9	8423.2	Si(CH3)3 (g) → Si (g) + 3 C (g) + 9 H (g)	Δ_rH°(0 K) = 1070.89 ± 1.60 kcal/mol	Ruscic G4
1.8	8418.3	Si(CH3)4 (g) → Si (g) + 4 C (g) + 12 H (g)	Δ_rH°(0 K) = 1449.49 ± 2.16 (×1.067) kcal/mol	Ruscic CBS-n
1.7	546.1	SiF4 (g) + 2 H2O (cr,l) → Si (cr,l) + O2 (g) + 4 HF (aq, 5 H2O)	Δ_rH°(298.15 K) = 899.77 ± 1.20 kJ/mol	Paulechka 2020, Vorobev 1960, Hummel 1959, Johnson 1987, Good 1964, Good 1964, Johnson 1973
1.6	8423.1	Si(CH3)3 (g) → Si (g) + 3 C (g) + 9 H (g)	Δ_rH°(0 K) = 1070.39 ± 1.72 kcal/mol	Ruscic G3X
1.6	8377.3	2 CH3SiH3 (g) → SiH3SiH3 (g) + CH3CH3 (g)	Δ_rH°(0 K) = 11.43 ± 1.6 kcal/mol	Ruscic CBS-n
1.4	8388.4	CH3SiH2CH3 (g) → Si (g) + 2 C (g) + 8 H (g)	Δ_rH°(0 K) = 877.68 ± 1.50 kcal/mol	Ruscic W1RO

Top 10 species with enthalpies of formation correlated to the Δ_fH° 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	Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
94.4	Trimethylsilane	SiH(CH3)3 (g)	-125.8	-151.9	± 1.5	kJ/mol	74.1970 ± 0.0025	993-07-7*0
86.2	Tetramethylsilane	Si(CH3)4 (g)	-185.8	-216.2	± 1.9	kJ/mol	88.2236 ± 0.0033	75-76-3*0
84.8	Methylsilane	CH3SiH3 (g)	-9.81	-25.99	± 0.89	kJ/mol	46.14384 ± 0.00095	992-94-9*0
81.6	Trimethylsilylium	[Si(CH3)3]+ (g)	655.4	634.8	± 1.9	kJ/mol	73.1885 ± 0.0025	28927-31-3*0
78.2	Bromotrimethylsilane	SiBr(CH3)3 (g)	-259.3	-290.0	± 2.0	kJ/mol	153.0931 ± 0.0027	2857-97-8*0
76.9	Iodotrimethylsilane	SiI(CH3)3 (g)	-189.6	-214.4	± 2.1	kJ/mol	200.0935 ± 0.0025	16029-98-4*0
69.7	Fluorotrimethylsilane	SiF(CH3)3 (g)	-547.1	-570.7	± 2.0	kJ/mol	92.1875 ± 0.0025	420-56-4*0
64.8	Trimethylsilyl	Si(CH3)3 (g)	47.6	25.5	± 1.9	kJ/mol	73.1891 ± 0.0025	16571-41-8*0
64.8	Chlorotrimethylsilane	SiCl(CH3)3 (g)	-326.3	-349.4	± 2.3	kJ/mol	108.6418 ± 0.0027	75-77-4*0
62.7	Trimethylsilanide	[Si(CH3)3]- (g)	-41.9	-65.4	± 2.1	kJ/mol	73.1896 ± 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
0.984	8398.1	SiH(CH3)3 (g) + CH3SiH3 (g) → 2 CH3SiH2CH3 (g)	Δ_rG°(398 K) = -1.38 ± 0.10 kJ/mol	Doncaster 1986, 3rd Law
0.892	8419.1	Si(CH3)4 (g) + CH3SiH2CH3 (g) → 2 SiH(CH3)3 (g)	Δ_rG°(398 K) = -2.87 ± 0.32 kJ/mol	Doncaster 1986, 3rd Law
0.360	8389.1	CH3SiH2CH3 (g) + SiH4 (g) → 2 CH3SiH3 (g)	Δ_rG°(333 K) = -0.06 ± 1.38 kJ/mol	Russell 1959, Doncaster 1986, 3rd Law, est unc
0.257	8391.5	CH3CH2SiH3 (g) → CH3SiH2CH3 (g)	Δ_rH°(0 K) = -53.89 ± 3 kJ/mol	Vuori 2022
0.092	8391.4	CH3CH2SiH3 (g) → CH3SiH2CH3 (g)	Δ_rH°(0 K) = -12.86 ± 1.2 kcal/mol	Ruscic W1RO
0.078	8391.2	CH3CH2SiH3 (g) → CH3SiH2CH3 (g)	Δ_rH°(0 K) = -12.84 ± 1.3 kcal/mol	Ruscic G4
0.076	8389.6	CH3SiH2CH3 (g) + SiH4 (g) → 2 CH3SiH3 (g)	Δ_rH°(0 K) = 3.46 ± 3 kJ/mol	Vuori 2022
0.067	8391.1	CH3CH2SiH3 (g) → CH3SiH2CH3 (g)	Δ_rH°(0 K) = -12.78 ± 1.4 kcal/mol	Ruscic G3X
0.052	8420.4	Si(CH3)4 (g) + SiH4 (g) → 2 CH3SiH2CH3 (g)	Δ_rH°(0 K) = 2.51 ± 0.9 kcal/mol	Ruscic W1RO
0.051	8391.3	CH3CH2SiH3 (g) → CH3SiH2CH3 (g)	Δ_rH°(0 K) = -12.33 ± 1.6 kcal/mol	Ruscic CBS-n
0.048	8389.5	CH3SiH2CH3 (g) + SiH4 (g) → 2 CH3SiH3 (g)	Δ_rH°(0 K) = 0.86 ± 0.9 kcal/mol	Ruscic W1RO
0.048	8419.2	Si(CH3)4 (g) + CH3SiH2CH3 (g) → 2 SiH(CH3)3 (g)	Δ_rG°(333 K) = -2.54 ± 1.38 kJ/mol	Russell 1959, Doncaster 1986, 3rd Law, est unc
0.042	8420.2	Si(CH3)4 (g) + SiH4 (g) → 2 CH3SiH2CH3 (g)	Δ_rH°(0 K) = 3.01 ± 1.0 kcal/mol	Ruscic G4
0.039	8389.3	CH3SiH2CH3 (g) + SiH4 (g) → 2 CH3SiH3 (g)	Δ_rH°(0 K) = 0.92 ± 1.0 kcal/mol	Ruscic G4
0.032	8389.2	CH3SiH2CH3 (g) + SiH4 (g) → 2 CH3SiH3 (g)	Δ_rH°(0 K) = 1.05 ± 1.1 kcal/mol	Ruscic G3X
0.032	8420.1	Si(CH3)4 (g) + SiH4 (g) → 2 CH3SiH2CH3 (g)	Δ_rH°(0 K) = 3.44 ± 1.1 (×1.044) kcal/mol	Ruscic G3X
0.025	8420.3	Si(CH3)4 (g) + SiH4 (g) → 2 CH3SiH2CH3 (g)	Δ_rH°(0 K) = 3.09 ± 1.3 kcal/mol	Ruscic CBS-n
0.023	8389.4	CH3SiH2CH3 (g) + SiH4 (g) → 2 CH3SiH3 (g)	Δ_rH°(0 K) = 0.93 ± 1.3 kcal/mol	Ruscic CBS-n
0.020	8388.4	CH3SiH2CH3 (g) → Si (g) + 2 C (g) + 8 H (g)	Δ_rH°(0 K) = 877.68 ± 1.50 kcal/mol	Ruscic W1RO
0.018	8388.2	CH3SiH2CH3 (g) → Si (g) + 2 C (g) + 8 H (g)	Δ_rH°(0 K) = 875.79 ± 1.60 kcal/mol	Ruscic 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 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. 1.148 of the Thermochemical Network (2023); available at ATcT.anl.gov
4		T. L. Nguyen, J. Peeters, J.-F. Müller, A. Perera, D. H. Bross, B. Ruscic, and J. F. Stanton, Methanediol from Cloud-Processed Formaldehyde is Only a Minor Source of Atmospheric Formic Acid Natl. Acad. Sci. 120, e2304650120/1-8 (2023) [DOI: 10.1073/pnas.2304650120]
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.