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].

1,3-Propanediyl

Formula: CH2CH2CH2 (g, triplet Cs)

CAS RN: 32458-33-6

ATcT ID: 32458-33-6*11

SMILES: [CH2]C[CH2]

InChI: InChI=1S/C3H6/c1-3-2/h1-3H2

InChIKey: CUJPFPXNDSIBPG-UHFFFAOYSA-N

Hills Formula: C3H6

2D Image:

Aliases: CH2CH2CH2; 1,3-Propanediyl; Trimethylene diradical; Trimethylene biradical; Trimethylene

Relative Molecular Mass: 42.0797 ± 0.0024

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
319.3	307.1	± 1.3	kJ/mol

3D Image of CH2CH2CH2 (g, triplet Cs)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of CH2CH2CH2 (g, triplet Cs)

The 20 contributors listed below account only for 67.8% of the provenance of Δ_fH° of CH2CH2CH2 (g, triplet Cs).
A total of 46 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
5.8	3225.5	CH2CH2CH2 (g, triplet Cs) → CH2(CH2CH2) (g)	Δ_rH°(0 K) = -59.30 ± 1.2 kcal/mol	Ruscic W1RO
4.9	3225.4	CH2CH2CH2 (g, triplet Cs) → CH2(CH2CH2) (g)	Δ_rH°(0 K) = -59.82 ± 1.3 kcal/mol	Ruscic CBS-n
4.9	3225.2	CH2CH2CH2 (g, triplet Cs) → CH2(CH2CH2) (g)	Δ_rH°(0 K) = -59.03 ± 1.3 kcal/mol	Ruscic G4
4.3	3225.1	CH2CH2CH2 (g, triplet Cs) → CH2(CH2CH2) (g)	Δ_rH°(0 K) = -58.55 ± 1.4 kcal/mol	Ruscic G3X
4.2	3252.5	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.30 ± 1.2 kcal/mol	Ruscic W1RO
3.6	3252.4	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.18 ± 1.3 kcal/mol	Ruscic CBS-n
3.6	3252.2	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.12 ± 1.3 kcal/mol	Ruscic G4
3.5	3226.5	CH2CH2CH2 (g, triplet Cs) → CH3CCH3 (g, triplet)	Δ_rH°(0 K) = 1.98 ± 1.2 kcal/mol	Ruscic W1RO
3.2	3225.3	CH2CH2CH2 (g, triplet Cs) → CH2(CH2CH2) (g)	Δ_rH°(0 K) = -59.76 ± 1.6 kcal/mol	Ruscic CBS-n
3.1	3232.4	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, singlet Cs TS)	Δ_rH°(0 K) = 9.58 ± 1.2 kcal/mol	Ruscic W1RO
3.1	3252.1	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.19 ± 1.4 kcal/mol	Ruscic G3X
3.0	3226.2	CH2CH2CH2 (g, triplet Cs) → CH3CCH3 (g, triplet)	Δ_rH°(0 K) = 1.86 ± 1.3 kcal/mol	Ruscic G4
3.0	3226.4	CH2CH2CH2 (g, triplet Cs) → CH3CCH3 (g, triplet)	Δ_rH°(0 K) = 1.70 ± 1.3 kcal/mol	Ruscic CBS-n
2.6	3232.2	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, singlet Cs TS)	Δ_rH°(0 K) = 9.51 ± 1.3 kcal/mol	Ruscic G4
2.6	3226.1	CH2CH2CH2 (g, triplet Cs) → CH3CCH3 (g, triplet)	Δ_rH°(0 K) = 2.14 ± 1.4 kcal/mol	Ruscic G3X
2.4	3244.5	2 CH3CH2CH2 (g) → CH3CH2CH3 (g) + CH2CH2CH2 (g, triplet C2)	Δ_rH°(0 K) = 0.00 ± 0.85 kcal/mol	Ruscic W1RO
2.4	3252.3	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.30 ± 1.6 kcal/mol	Ruscic CBS-n
2.3	3232.1	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, singlet Cs TS)	Δ_rH°(0 K) = 9.93 ± 1.4 kcal/mol	Ruscic G3X
2.2	3244.1	2 CH3CH2CH2 (g) → CH3CH2CH3 (g) + CH2CH2CH2 (g, triplet C2)	Δ_rH°(0 K) = 0.00 ± 0.90 kcal/mol	Ruscic G3X
2.2	3244.4	2 CH3CH2CH2 (g) → CH3CH2CH3 (g) + CH2CH2CH2 (g, triplet C2)	Δ_rH°(0 K) = 0.00 ± 0.90 kcal/mol	Ruscic CBS-n

Top 10 species with enthalpies of formation correlated to the Δ_fH° of CH2CH2CH2 (g, triplet Cs)

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
100.0	1,3-Propanediyl	CH2CH2CH2 (g, triplet)	319.3	307.9	± 1.3	kJ/mol	42.0797 ± 0.0024	32458-33-6*1
100.0	1,3-Propanediyl	CH2CH2CH2 (g)	319.3	307.9	± 1.3	kJ/mol	42.0797 ± 0.0024	32458-33-6*0
48.8	1,3-Propanediyl	CH2CH2CH2 (g, triplet C2)	320.3	308.5	± 1.5	kJ/mol	42.0797 ± 0.0024	32458-33-6*12
25.2	1-Methylethylidene	CH3CCH3 (g, triplet)	326.9	313.7	± 1.2	kJ/mol	42.0797 ± 0.0024	40852-89-9*1
24.6	1,3-Propanediyl	CH2CH2CH2 (g, singlet Cs TS)	358.7	343.7	± 1.4	kJ/mol	42.0797 ± 0.0024	32458-33-6*22
22.1	Propylidene	CH3CH2CH (g)	349.52	335.83	± 0.92	kJ/mol	42.0797 ± 0.0024	6700-78-3*0
22.1	Propylidene	CH3CH2CH (g, triplet)	349.52	335.76	± 0.92	kJ/mol	42.0797 ± 0.0024	6700-78-3*1
22.1	Propylidene	CH3CH2CH (g, triplet gauche)	349.52	335.83	± 0.92	kJ/mol	42.0797 ± 0.0024	6700-78-3*11
19.9	n-Propyl	CH3CH2CH2 (g)	118.47	101.06	± 0.39	kJ/mol	43.0877 ± 0.0024	2143-61-5*0
13.5	1,3-Propanediyl	CH2CH2CH2 (g, singlet C2v TS EE)	337.7	323.0	± 2.2	kJ/mol	42.0797 ± 0.0024	32458-33-6*21

Most Influential reactions involving CH2CH2CH2 (g, triplet Cs)

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
1.000	3223.1	CH2CH2CH2 (g, triplet) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = 0 ± 0 cm-1	Ruscic W1RO, Ruscic G4, Ruscic CBS-n
1.000	3222.1	CH2CH2CH2 (g) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = 0 ± 0 cm-1	Ruscic W1RO, Ruscic G4, Ruscic CBS-n
0.145	3224.5	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, triplet C2)	Δ_rH°(0 K) = 46 ± 300 cm-1	Ruscic W1RO
0.136	3224.4	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, triplet C2)	Δ_rH°(0 K) = 69 ± 310 cm-1	Ruscic CBS-n
0.136	3224.2	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, triplet C2)	Δ_rH°(0 K) = 86 ± 310 cm-1	Ruscic G4
0.131	3224.1	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, triplet C2)	Δ_rH°(0 K) = 81 ± 315 cm-1	Ruscic G3X
0.106	3224.3	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, triplet C2)	Δ_rH°(0 K) = 84 ± 350 cm-1	Ruscic CBS-n
0.105	3232.4	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, singlet Cs TS)	Δ_rH°(0 K) = 9.58 ± 1.2 kcal/mol	Ruscic W1RO
0.089	3232.2	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, singlet Cs TS)	Δ_rH°(0 K) = 9.51 ± 1.3 kcal/mol	Ruscic G4
0.085	3226.5	CH2CH2CH2 (g, triplet Cs) → CH3CCH3 (g, triplet)	Δ_rH°(0 K) = 1.98 ± 1.2 kcal/mol	Ruscic W1RO
0.077	3232.1	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, singlet Cs TS)	Δ_rH°(0 K) = 9.93 ± 1.4 kcal/mol	Ruscic G3X
0.074	3252.5	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.30 ± 1.2 kcal/mol	Ruscic W1RO
0.072	3226.4	CH2CH2CH2 (g, triplet Cs) → CH3CCH3 (g, triplet)	Δ_rH°(0 K) = 1.70 ± 1.3 kcal/mol	Ruscic CBS-n
0.072	3226.2	CH2CH2CH2 (g, triplet Cs) → CH3CCH3 (g, triplet)	Δ_rH°(0 K) = 1.86 ± 1.3 kcal/mol	Ruscic G4
0.063	3252.2	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.12 ± 1.3 kcal/mol	Ruscic G4
0.063	3252.4	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.18 ± 1.3 kcal/mol	Ruscic CBS-n
0.062	3226.1	CH2CH2CH2 (g, triplet Cs) → CH3CCH3 (g, triplet)	Δ_rH°(0 K) = 2.14 ± 1.4 kcal/mol	Ruscic G3X
0.062	3225.5	CH2CH2CH2 (g, triplet Cs) → CH2(CH2CH2) (g)	Δ_rH°(0 K) = -59.30 ± 1.2 kcal/mol	Ruscic W1RO
0.059	3232.3	CH2CH2CH2 (g, triplet Cs) → CH2CH2CH2 (g, singlet Cs TS)	Δ_rH°(0 K) = 8.27 ± 1.6 kcal/mol	Ruscic CBS-n
0.054	3252.1	CH3CH2CH (g, triplet gauche) → CH2CH2CH2 (g, triplet Cs)	Δ_rH°(0 K) = -7.19 ± 1.4 kcal/mol	Ruscic G3X

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.