Selected ATcT [1, 2] enthalpy of formation based on version 1.122p of the Thermochemical Network [3]

This version of ATcT results was generated from an expansion of version 1.122o [4] to include an updated enthalpy of formation for Hydrazine. [5].

Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Molecular
Mass		 ATcT ID
Methyl iodide cation[CH3I]+ (g)C[I+]944.79935.39± 0.18kJ/mol141.93844 ±
0.00083		12538-72-6*0

Representative Geometry of [CH3I]+ (g)

spin ON           spin OFF
          

Top contributors to the provenance of ΔfH° of [CH3I]+ (g)

The 8 contributors listed below account for 90.4% of the provenance of ΔfH° of [CH3I]+ (g).

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
44.64436.2 CH3I (g) → [CH3]+ (g) + I (g) ΔrH°(0 K) = 12.251 ± 0.0024 eVLee 2007
25.14436.1 CH3I (g) → [CH3]+ (g) + I (g) ΔrH°(0 K) = 12.248 ± 0.003 (×1.067) eVBodi 2009
5.81888.1 2 H2 (g) + C (graphite) → CH4 (g) ΔrG°(1165 K) = 37.521 ± 0.068 kJ/molSmith 1946, note COf, 3rd Law
4.04436.3 CH3I (g) → [CH3]+ (g) + I (g) ΔrH°(0 K) = 12.243 ± 0.008 eVLee 2007, Bodi 2009
3.74438.4 CH3I (g) + HI (g) → I2 (g) + CH4 (g) ΔrG°(669 K) = -10.34 ± 0.09 (×2.134) kcal/molGoy 1965, 3rd Law
3.44438.2 CH3I (g) + HI (g) → I2 (g) + CH4 (g) ΔrG°(630.5 K) = -10.48 ± 0.08 (×2.484) kcal/molGolden 1965, 3rd Law, Cox 1970
2.24436.5 CH3I (g) → [CH3]+ (g) + I (g) ΔrH°(0 K) = 12.24 ± 0.01 (×1.067) eVMintz 1976
1.34450.1 2 CH3I (l) + 7/2 O2 (g) → 2 CO2 (g) + 3 H2O (l) + I2 (cr,l) ΔrH°(298.15 K) = -1617.2 ± 0.6 (×4.861) kJ/molCarson 1993

Top 10 species with enthalpies of formation correlated to the ΔfH° of [CH3I]+ (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
99.7 IodomethaneCH3I (g)CI24.5014.97± 0.18kJ/mol141.93899 ±
0.00083		74-88-4*0
89.4 IodomethaneCH3I (l)CI-12.18± 0.20kJ/mol141.93899 ±
0.00083		74-88-4*590
31.2 Methylium[CH3]+ (g)[CH3+]1099.3361095.392± 0.056kJ/mol15.03397 ±
0.00083		14531-53-4*0
30.6 MethaneCH4 (g)C-66.561-74.530± 0.055kJ/mol16.04246 ±
0.00085		74-82-8*0
28.6 MethylCH3 (g)[CH3]149.867146.453± 0.059kJ/mol15.03452 ±
0.00083		2229-07-4*0
25.5 Methane cation[CH4]+ (g)[CH4+]1150.6691144.286± 0.065kJ/mol16.04191 ±
0.00085		20741-88-2*0
9.4 BromomethaneCH3Br (g)CBr-20.86-36.26± 0.18kJ/mol94.9385 ±
0.0013		74-83-9*0
9.1 Methyl bromide cation[CH3Br]+ (g)C[Br+]996.25981.34± 0.18kJ/mol94.9380 ±
0.0013		12538-70-4*0
8.9 BromomethaneCH3Br (l)CBr-56.58-59.60± 0.19kJ/mol94.9385 ±
0.0013		74-83-9*590
8.3 ChloromethaneCH3Cl (g)CCl-74.63-82.56± 0.19kJ/mol50.4872 ±
0.0012		74-87-3*0

Most Influential reactions involving [CH3I]+ (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
0.9044435.3 CH3I (g) → [CH3I]+ (g) ΔrH°(0 K) = 76930.0 ± 1.0 cm-1Baig 1981
0.0564435.1 CH3I (g) → [CH3I]+ (g) ΔrH°(0 K) = 76932 ± 4 cm-1Urban 2002
0.0364435.2 CH3I (g) → [CH3I]+ (g) ΔrH°(0 K) = 76934 ± 5 cm-1Strobel 1994, Strobel 1993
0.0024435.5 CH3I (g) → [CH3I]+ (g) ΔrH°(0 K) = 76930 ± 20 cm-1Price 1936, est unc
0.0004435.6 CH3I (g) → [CH3I]+ (g) ΔrH°(0 K) = 9.540 ± 0.004 eVKarlsson 1977
0.0004435.7 CH3I (g) → [CH3I]+ (g) ΔrH°(0 K) = 9.533 ± 0.01 eVTsai 1975
0.0004435.8 CH3I (g) → [CH3I]+ (g) ΔrH°(0 K) = 9.550 ± 0.006 (×2) eVNicholson 1965
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. 1.122p of the Thermochemical Network (2020); available at ATcT.anl.gov
4   P. B. Changala, T. L. Nguyen, J. H. Baraban, G. B. Ellison, J. F. Stanton, D. H. Bross, and B. Ruscic,
Active Thermochemical Tables: The Adiabatic Ionization Energy of Hydrogen Peroxide.
J. Phys. Chem. A 121, 8799-8806 (2017) [DOI: 10.1021/acs.jpca.7b06221] (highlighted on the journal cover)
5   D. Feller, D. H. Bross, and B. Ruscic,
Enthalpy of Formation of N2H4 (Hydrazine) Revisited.
J. Phys. Chem. A 121, 6187-6198 (2017) [DOI: 10.1021/acs.jpca.7b06017]
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]
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]).
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.