Selected ATcT [1, 2] enthalpy of formation based on version 1.202 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.176 in order to include species related to the thermochemistry of glycine[4].

Diiodomethane

Formula: CH2I2 (g)

CAS RN: 75-11-6

ATcT ID: 75-11-6*0

SMILES: C(I)I

InChI: InChI=1S/CH2I2/c2-1-3/h1H2

InChIKey: NZZFYRREKKOMAT-UHFFFAOYSA-N

Hills Formula: C1H2I2

2D Image:

Aliases: CH2I2; Diiodomethane; Methylene iodide; Methylene diiodide; Methane diiodide; Carbon diiodide; Diiodocarbon; Mi-gee

Relative Molecular Mass: 267.83552 ± 0.00081

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
122.96	113.52	± 0.78	kJ/mol

3D Image of CH2I2 (g)

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Top contributors to the provenance of Δ_fH° of CH2I2 (g)

The 4 contributors listed below account for 94.1% of the provenance of Δ_fH° of CH2I2 (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
43.0	6432.1	CH2I2 (l) + 3/2 O2 (g) → CO2 (g) + H2O (cr,l) + I2 (cr,l)	Δ_rH°(298.15 K) = -747.8 ± 0.6 kJ/mol	Carson 1993, Carson 1993
41.1	6433.1	CH2I2 (l) → CH2I2 (g)	Δ_rH°(298.15 K) = 45.6 ± 0.6 kJ/mol	Carson 1994, Carson 1994
5.1	6430.1	2 CH3I (g) → CH2I2 (g) + CH4 (g)	Δ_rH°(0 K) = 4.0 ± 2.5 (×1.354) kJ/mol	Bross 2023
4.8	6429.1	CH2I2 (g) → C (g) + 2 H (g) + 2 I (g)	Δ_rH°(0 K) = 1238.3 ± 2.5 (×1.414) kJ/mol	Bross 2023
43.0	6432.1	CH2I2 (l) + 3/2 O2 (g) → CO2 (g) + H2O (cr,l) + I2 (cr,l)	Δ_rH°(298.15 K) = -747.8 ± 0.6 kJ/mol	Carson 1993, Carson 1993
41.1	6433.1	CH2I2 (l) → CH2I2 (g)	Δ_rH°(298.15 K) = 45.6 ± 0.6 kJ/mol	Carson 1994, Carson 1994
5.1	6430.1	2 CH3I (g) → CH2I2 (g) + CH4 (g)	Δ_rH°(0 K) = 4.0 ± 2.5 (×1.354) kJ/mol	Bross 2023
4.8	6429.1	CH2I2 (g) → C (g) + 2 H (g) + 2 I (g)	Δ_rH°(0 K) = 1238.3 ± 2.5 (×1.414) kJ/mol	Bross 2023

Top 10 species with enthalpies of formation correlated to the Δ_fH° of CH2I2 (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
68.2	Diiodomethane	CH2I2 (l)		68.21	± 0.58	kJ/mol	267.83552 ± 0.00081	75-11-6*590
68.2	Diiodomethane	CH2I2 (l)		68.21	± 0.58	kJ/mol	267.83552 ± 0.00081	75-11-6*590
3.6	Tetraiodomethane	CI4 (g)	323.7	318.6	± 1.1	kJ/mol	519.62858 ± 0.00081	507-25-5*0
3.6	Tetraiodomethane	CI4 (g)	323.7	318.6	± 1.1	kJ/mol	519.62858 ± 0.00081	507-25-5*0
3.1	Iodomethane	CH3I (g)	24.53	14.99	± 0.16	kJ/mol	141.93899 ± 0.00083	74-88-4*0
3.1	Iodomethane	CH3I (g)	24.53	14.99	± 0.16	kJ/mol	141.93899 ± 0.00083	74-88-4*0
3.1	Iodomethane cation	[CH3I]+ (g)	944.82	935.42	± 0.16	kJ/mol	141.93844 ± 0.00083	12538-72-6*0
3.1	Iodomethane cation	[CH3I]+ (g)	944.82	935.42	± 0.16	kJ/mol	141.93844 ± 0.00083	12538-72-6*0
2.8	Carbonic acid	C(O)(OH)2 (aq, undissoc)		-698.669	± 0.028	kJ/mol	62.0248 ± 0.0012	463-79-6*1000
2.8	Carbonic acid	C(O)(OH)2 (aq, undissoc)		-698.669	± 0.028	kJ/mol	62.0248 ± 0.0012	463-79-6*1000
2.7	Iodomethane	CH3I (l)		-12.15	± 0.18	kJ/mol	141.93899 ± 0.00083	74-88-4*590
2.7	Iodomethane	CH3I (l)		-12.15	± 0.18	kJ/mol	141.93899 ± 0.00083	74-88-4*590
2.5	Oxonium	[H3O]+ (aq)		-285.801	± 0.022	kJ/mol	19.02267 ± 0.00037	13968-08-6*800
2.5	Water	H2O (l)		-285.801	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*590
2.5	Water	H2O (cr,l)	-286.273	-285.801	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*500
2.5	Water	H2O (cr,l)	-286.273	-285.801	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*500
2.5	Water	H2O (l, eq.press.)		-285.802	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*589
2.5	Oxonium	[H3O]+ (aq)		-285.801	± 0.022	kJ/mol	19.02267 ± 0.00037	13968-08-6*800
2.5	Water	H2O (l)		-285.801	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*590
2.5	Water	H2O (l, eq.press.)		-285.802	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*589

Most Influential reactions involving CH2I2 (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
0.906	6433.1	CH2I2 (l) → CH2I2 (g)	Δ_rH°(298.15 K) = 45.6 ± 0.6 kJ/mol	Carson 1994, Carson 1994
0.067	6431.1	2 CH2I2 (g) → CI4 (g) + CH4 (g)	Δ_rH°(0 K) = 18.3 ± 2.5 (×2.828) kJ/mol	Bross 2023
0.060	6430.1	2 CH3I (g) → CH2I2 (g) + CH4 (g)	Δ_rH°(0 K) = 4.0 ± 2.5 (×1.354) kJ/mol	Bross 2023
0.048	6429.1	CH2I2 (g) → C (g) + 2 H (g) + 2 I (g)	Δ_rH°(0 K) = 1238.3 ± 2.5 (×1.414) kJ/mol	Bross 2023
0.020	6433.2	CH2I2 (l) → CH2I2 (g)	Δ_rH°(298.15 K) = 46.1 ± 4.0 kJ/mol	NBS Tables 1989
0.906	6433.1	CH2I2 (l) → CH2I2 (g)	Δ_rH°(298.15 K) = 45.6 ± 0.6 kJ/mol	Carson 1994, Carson 1994
0.067	6431.1	2 CH2I2 (g) → CI4 (g) + CH4 (g)	Δ_rH°(0 K) = 18.3 ± 2.5 (×2.828) kJ/mol	Bross 2023
0.060	6430.1	2 CH3I (g) → CH2I2 (g) + CH4 (g)	Δ_rH°(0 K) = 4.0 ± 2.5 (×1.354) kJ/mol	Bross 2023
0.048	6429.1	CH2I2 (g) → C (g) + 2 H (g) + 2 I (g)	Δ_rH°(0 K) = 1238.3 ± 2.5 (×1.414) kJ/mol	Bross 2023
0.020	6433.2	CH2I2 (l) → CH2I2 (g)	Δ_rH°(298.15 K) = 46.1 ± 4.0 kJ/mol	NBS Tables 1989

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. 1.202 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		B. Ruscic and D. H. Bross Accurate and Reliable Thermochemistry by Data Analysis of Complex Thermochemical Networks using Active Thermochemical Tables: The Case of Glycine Thermochemistry Faraday Discuss. (in press) (2024) [DOI: 10.1039/D4FD00110A]
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.