Selected ATcT [1, 2] enthalpy of formation based on version 1.156 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.148 to include species relevant to a recent study of the oxidation of ethylene [4] as well as new measurements that led to refining the thermochemistry of CF and SiF and their cations [5].

Silylidyne

Formula: SiH (g)
CAS RN: 13774-94-2
ATcT ID: 13774-94-2*0
SMILES: [SiH]
InChI: InChI=1S/HSi/h1H
InChIKey: QHGSGZLLHBKSAH-UHFFFAOYSA-N
Hills Formula: H1Si1

2D Image:

[SiH]
Aliases: SiH; Silylidyne; Silicon monohydride
Relative Molecular Mass: 29.09344 ± 0.00031

   ΔfH°(0 K)   ΔfH°(298.15 K)UncertaintyUnits
371.24373.03± 0.67kJ/mol

3D Image of SiH (g)

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

The 20 contributors listed below account only for 78.2% of the provenance of ΔfH° of SiH (g).
A total of 34 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
12.68342.1 Si (cr,l) + 2 F2 (g) → SiF4 (g) ΔrH°(298.15 K) = -385.98 ± 0.19 kcal/molWise 1963, Wise 1963, Wise 1962
6.98425.10 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.47 ± 0.20 kcal/molFeller 2008, Feller 1999a, Feller 1999a
4.9546.1 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
4.98285.2 Si (cr,l) → Si (g) ΔrG°(1525 K) = 231.1 ± 2.0 kJ/molBatdorf 1959, 3rd Law
4.48435.1 SiH3SiH3 (g) → 2 Si (cr,l) + 3 H2 (g) ΔrH°(298.15 K) = -19.1 ± 0.6 (×1.646) kcal/molGunn 1961, est unc
4.48425.9 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.63 ± 0.25 kcal/molKarton 2007b
4.38399.1 SiH4 (g) → Si (cr,l) + 2 H2 (g) ΔrH°(298.15 K) = -8.3 ± 0.5 kcal/molGunn 1961, Gurvich TPIS, est unc
3.78386.5 SiF (g, doublet) CH (g) → SiH (g) CF (g) ΔrH°(0 K) = 19.61 ± 0.25 kcal/molKarton 2007b
3.38342.3 Si (cr,l) + 2 F2 (g) → SiF4 (g) ΔrH°(298.15 K) = -1615.78 ± 0.46 (×3.364) kJ/molJohnson 1986, Johnson 1986
3.08425.8 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.50 ± 0.30 kcal/molKarton 2007b
3.08425.7 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.48 ± 0.30 kcal/molKarton 2007b
2.98320.6 SiO2 (cr,l) Si (cr,l) → 2 SiO (g) ΔrG°(1618 K) = 37.94 ± 0.29 kcal/molRamstad 1961, 3rd Law, Gurvich TPIS
2.88384.7 SiF4 (g) → SiF (g, doublet) + 3 F (g) ΔrH°(0 K) = 425.42 ± 0.25 kcal/molKarton 2007b
2.78303.1 Si (cr,l) O2 (g) → SiO2 (cr,l) ΔrH°(298.15 K) = -217.58 ± 0.35 (×1.164) kcal/molGood 1964, Good 1964, Good 1962, King 1951
2.58312.10 SiO (g) → Si (g) O (g) ΔrH°(0 K) = 190.23 ± 0.30 kcal/molKarton 2011
2.58312.5 SiO (g) → Si (g) O (g) ΔrH°(0 K) = 189.99 ± 0.30 kcal/molFeller 2008
2.48385.5 SiH4 (g) + 4 SiF (g, doublet) → SiF4 (g) + 4 SiH (g) ΔrH°(0 K) = 17.46 ± 1.00 kcal/molKarton 2007b
1.98384.5 SiF4 (g) → SiF (g, doublet) + 3 F (g) ΔrH°(0 K) = 425.49 ± 0.30 kcal/molKarton 2007b
1.98384.6 SiF4 (g) → SiF (g, doublet) + 3 F (g) ΔrH°(0 K) = 425.58 ± 0.30 kcal/molKarton 2007b
1.98285.3 Si (cr,l) → Si (g) ΔrH°(1932 K) = 393.1 ± 2.5 (×1.269) kJ/molDrowart 1960, 2nd Law, Gurvich TPIS

Top 10 species with enthalpies of formation correlated to the ΔfH° of SiH (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
82.5 Silyliumylidene[SiH]+ (g)[SiH+]1136.501137.70± 0.80kJ/mol29.09289 ±
0.00031
31241-66-4*0
80.3 SiliconSi (g)[Si]450.32454.66± 0.56kJ/mol28.08550 ±
0.00030
7440-21-3*0
80.3 Silicon anionSi- (g)[Si-]316.26319.24± 0.56kJ/mol28.08605 ±
0.00030
14337-02-1*0
80.3 Silicon cationSi+ (g)[Si+]1236.841240.97± 0.56kJ/mol28.08495 ±
0.00030
14067-07-3*0
80.3 Silicon atom dication[Si]+2 (g)[Si++]2813.982816.96± 0.56kJ/mol28.08440 ±
0.00030
14175-55-4*0
80.3 Silicon atom trication[Si]+3 (g)[Si+3]6045.566048.54± 0.56kJ/mol28.08385 ±
0.00030
14175-56-5*0
80.3 Silicon atom tetracation[Si]+4 (g)[Si+4]10401.0810404.06± 0.56kJ/mol28.08331 ±
0.00030
22537-24-2*0
74.8 FluorosilylidyneSiF (g, doublet)F[Si]-60.26-58.43± 0.62kJ/mol47.08390 ±
0.00030
11128-24-8*1
74.8 FluorosilylidyneSiF (g)F[Si]-60.26-58.43± 0.62kJ/mol47.08390 ±
0.00030
11128-24-8*0
74.8 FluorosilylidyneSiF (g, quartet)F[Si]297.24298.46± 0.62kJ/mol47.08390 ±
0.00030
11128-24-8*2

Most Influential reactions involving SiH (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
0.8668426.1 SiH (g) → [SiH]+ (g) ΔrH°(0 K) = 7.934 ± 0.005 eVChen 2022
0.7178427.6 [SiH]- (g) → SiH (g) ΔrH°(0 K) = 1.254 ± 0.010 eVFeller 2016a, est unc
0.2258425.10 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.47 ± 0.20 kcal/molFeller 2008, Feller 1999a, Feller 1999a
0.1948386.5 SiF (g, doublet) CH (g) → SiH (g) CF (g) ΔrH°(0 K) = 19.61 ± 0.25 kcal/molKarton 2007b
0.1788385.5 SiH4 (g) + 4 SiF (g, doublet) → SiF4 (g) + 4 SiH (g) ΔrH°(0 K) = 17.46 ± 1.00 kcal/molKarton 2007b
0.1638427.1 [SiH]- (g) → SiH (g) ΔrH°(0 K) = 1.277 ± 0.009 (×2.327) eVKasdan 1975a
0.1448425.9 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.63 ± 0.25 kcal/molKarton 2007b
0.1318485.4 SiH3SiH (g, singlet) + 2 SiH2 (g, singlet) → SiH2SiH2 (g, singlet) SiH3 (g) SiH (g) ΔrH°(0 K) = 0.91 ± 0.90 kcal/molRuscic W1RO
0.1068485.2 SiH3SiH (g, singlet) + 2 SiH2 (g, singlet) → SiH2SiH2 (g, singlet) SiH3 (g) SiH (g) ΔrH°(0 K) = 1.42 ± 1.00 kcal/molRuscic G4
0.1008425.7 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.48 ± 0.30 kcal/molKarton 2007b
0.1008425.8 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.50 ± 0.30 kcal/molKarton 2007b
0.0878485.1 SiH3SiH (g, singlet) + 2 SiH2 (g, singlet) → SiH2SiH2 (g, singlet) SiH3 (g) SiH (g) ΔrH°(0 K) = 1.01 ± 1.10 kcal/molRuscic G3X
0.0698385.6 SiH4 (g) + 4 SiF (g, doublet) → SiF4 (g) + 4 SiH (g) ΔrH°(0 K) = 17.7 ± 1.6 kcal/molFeller 1999a, Feller 1999a
0.0628485.3 SiH3SiH (g, singlet) + 2 SiH2 (g, singlet) → SiH2SiH2 (g, singlet) SiH3 (g) SiH (g) ΔrH°(0 K) = 0.81 ± 1.30 kcal/molRuscic CBS-n
0.0568426.2 SiH (g) → [SiH]+ (g) ΔrH°(0 K) = 7.912 ± 0.010 (×1.957) eVBerkowitz 1987a
0.0288425.6 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 70.47 ± 0.56 kcal/molKarton 2007b
0.0288427.5 [SiH]- (g) → SiH (g) ΔrH°(0 K) = 1.246 ± 0.050 eVRuscic W1RO
0.0218430.6 SiH2 (g, singlet) → SiH (g) H (g) ΔrH°(0 K) = 315.93 ± 4.6 kJ/molGuo 2023
0.0198427.3 [SiH]- (g) → SiH (g) ΔrH°(0 K) = 1.220 ± 0.061 eVRuscic G4
0.0188425.12 SiH (g) → Si (g) H (g) ΔrH°(0 K) = 3.06 ± 0.03 eVLi 2013c, est unc


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. 1.156 of the Thermochemical Network (2024); available at ATcT.anl.gov
4   N. A. Seifert, B. Ruscic, R. Sivaramakrishnan, and K. Prozument,
The C2H4O Isomers in the Oxidation of Ethylene
J. Mol. Spectrosc. 398, 111847/1-8 (2023) [DOI: 10.1016/j.jms.2023.111847]
5   U. Jacovella, B. Ruscic, N. L. Chen, H.-L. Le, S. Boyé-Péronne, S. Hartweg, M. Roy-Chowdhury, G. A. Garcia, J.-C. Loison, and B. Gans,
Refining Thermochemical Properties of CF, SiF, and Their Cations by Combining Photoelectron Spectroscopy, Quantum Chemical Calculations, and the Active Thermochemical Tables Approach
Phys. Chem. Chem. Phys. 25, 30838-30847 (2023) [DOI: 10.1039/D3CP04244H]
6   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]
7   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 [6] and Ruscic and Bross[7]).
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.