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].

Dichlorine cation

Formula: [Cl2]+ (g)

CAS RN: 12595-90-3

ATcT ID: 12595-90-3*0

SMILES: Cl[Cl+]

InChI: InChI=1S/Cl2/c1-2/q+1

InChIKey: IPYDCMMBWLZPDH-UHFFFAOYSA-N

Hills Formula: Cl2+

2D Image:

Aliases: [Cl2]+; Dichlorine cation; Diatomic chlorine cation; Diatomic chlorine ion (1+); Molecular chlorine cation; Molecular chlorine ion (1+); Chlorine molecule cation; Chlorine molecule ion (1+); Chlorine cation; Chlorine ion (1+); Dichlorine ion (1+)

Relative Molecular Mass: 70.9049 ± 0.0018

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
1108.307	1108.286	± 0.0062	kJ/mol

3D Image of [Cl2]+ (g)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of [Cl2]+ (g)

The 1 contributors listed below account for 91.1% of the provenance of Δ_fH° of [Cl2]+ (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
91.1	744.1	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 92647.37 ± 0.5 cm-1	Mollet 2013, note unc

Most Influential reactions involving [Cl2]+ (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
0.911	744.1	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 92647.37 ± 0.5 cm-1	Mollet 2013, note unc
0.087	744.2	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 92645.6 ± 1.0 (×1.61) cm-1	Li 2007
0.000	744.17	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 264.915 ± 0.097 kcal/mol	Feller 2017a
0.000	744.3	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.481 ± 0.003 (×1.957) eV	Yencha 1995
0.000	744.4	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.480 ± 0.005 (×1.384) eV	van Lonkhuyzen 1984
0.000	744.7	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.49 ± 0.01 eV	Anderson 1971, est unc
0.000	744.9	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.49 ± 0.01 eV	Dyke 1984c, est unc
0.000	744.8	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.48 ± 0.01 eV	Watanabe 1957
0.000	744.5	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.49 ± 0.01 eV	Cornford 1971, est unc
0.000	744.6	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.51 ± 0.01 (×2.327) eV	Potts 1971
0.000	744.16	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.506 ± 0.040 eV	Ruscic W1RO
0.000	746.7	[Cl2]+ (g) → 2 Cl (g)	Δ_rH°(0 K) = -208.79 ± 1.50 kcal/mol	Ruscic W1RO
0.000	746.4	[Cl2]+ (g) → 2 Cl (g)	Δ_rH°(0 K) = -207.81 ± 1.60 kcal/mol	Ruscic G4
0.000	746.3	[Cl2]+ (g) → 2 Cl (g)	Δ_rH°(0 K) = -209.13 ± 1.72 kcal/mol	Ruscic G3X
0.000	744.13	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.466 ± 0.073 eV	Ruscic G4
0.000	744.12	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.470 ± 0.093 eV	Ruscic G3X
0.000	744.15	Cl2 (g) → [Cl2]+ (g)	Δ_rH°(0 K) = 11.495 ± 0.099 eV	Ruscic CBS-n

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. 1.156 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.