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

This version of ATcT results was generated from an expansion of version 1.122b [4][5] to include the enthalpies of formation of methylamine, dimethylamine and trimethylamine that were used as reference values to derive the bond dissociation energies of 20 diatomic molecules containing 3d transition metals.[6].

Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
Iminomethyl anion[HCNH]- (g)[CH-]=N237.4233.6± 1.8kJ/mol28.03387 ±

Representative Geometry of [HCNH]- (g)

spin ON           spin OFF

Top contributors to the provenance of ΔfH° of [HCNH]- (g)

The 20 contributors listed below account only for 88.6% of the provenance of ΔfH° of [HCNH]- (g).
A total of 21 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.

Reaction Measured Quantity Reference
11.12168.8 [HCNH]- (g, trans) → HCNH (g, trans) ΔrH°(0 K) = 0.400 ± 0.050 eVRuscic W1RO
7.62171.8 [HCNH]- (g, trans) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 329.14 ± 1.50 kcal/molRuscic W1RO
7.42168.4 [HCNH]- (g, trans) → HCNH (g, trans) ΔrH°(0 K) = 0.419 ± 0.061 eVRuscic G4
6.62171.7 [HCNH]- (g, trans) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 328.12 ± 1.60 kcal/molRuscic CBS-n
6.62171.4 [HCNH]- (g, trans) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 330.09 ± 1.60 kcal/molRuscic G4
5.72171.3 [HCNH]- (g, trans) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 329.28 ± 1.72 kcal/molRuscic G3X
3.92169.8 [HCNH]- (g, cis) → HCNH (g, cis) ΔrH°(0 K) = 0.428 ± 0.050 eVRuscic W1RO
3.82168.3 [HCNH]- (g, trans) → HCNH (g, trans) ΔrH°(0 K) = 0.388 ± 0.085 eVRuscic G3X
3.62171.6 [HCNH]- (g, trans) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 328.57 ± 2.16 kcal/molRuscic CBS-n
3.42168.7 [HCNH]- (g, trans) → HCNH (g, trans) ΔrH°(0 K) = 0.370 ± 0.090 eVRuscic CBS-n
3.22168.6 [HCNH]- (g, trans) → HCNH (g, trans) ΔrH°(0 K) = 0.398 ± 0.092 eVRuscic CBS-n
3.02172.8 [HCNH]- (g, cis) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 325.41 ± 1.50 kcal/molRuscic W1RO
3.02176.8 [HCNH]- (g, trans) → [HCNH]- (g, cis) ΔrH°(0 K) = 1304 ± 300 cm-1Ruscic W1RO
2.82176.7 [HCNH]- (g, trans) → [HCNH]- (g, cis) ΔrH°(0 K) = 1291 ± 310 cm-1Ruscic CBS-n
2.82176.4 [HCNH]- (g, trans) → [HCNH]- (g, cis) ΔrH°(0 K) = 1238 ± 310 cm-1Ruscic G4
2.72176.3 [HCNH]- (g, trans) → [HCNH]- (g, cis) ΔrH°(0 K) = 1257 ± 315 cm-1Ruscic G3X
2.72172.7 [HCNH]- (g, cis) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 324.43 ± 1.60 kcal/molRuscic CBS-n
2.72172.4 [HCNH]- (g, cis) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 326.55 ± 1.60 kcal/molRuscic G4
2.62169.4 [HCNH]- (g, cis) → HCNH (g, cis) ΔrH°(0 K) = 0.445 ± 0.061 eVRuscic G4
2.32172.3 [HCNH]- (g, cis) → C (g) N (g) + 2 H (g) ΔrH°(0 K) = 325.69 ± 1.72 kcal/molRuscic G3X

Top 10 species with enthalpies of formation correlated to the ΔfH° of [HCNH]- (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.

Species Name Formula Image    ΔfH°(0 K)    ΔfH°(298.15 K) Uncertainty Units Relative
100.0 Iminomethyl anion[HCNH]- (g, trans)[CH-]=N237.4233.6± 1.8kJ/mol28.03387 ±
63.5 Iminomethyl anion[HCNH]- (g, cis)[CH-]=N252.7248.9± 1.8kJ/mol28.03387 ±
17.3 (E)-IminomethylHCNH (g, trans)[CH]=N275.83272.22± 0.71kJ/mol28.03332 ±
17.3 IminomethylHCNH (g)[CH]=N275.83272.23± 0.71kJ/mol28.03332 ±
15.7 (Z)-IminomethylHCNH (g, cis)[CH]=N294.51291.02± 0.92kJ/mol28.03332 ±
6.6 MethyleneamidogenCH2N (g)C=[N]241.95238.30± 0.67kJ/mol28.03332 ±
4.4 Iminomethyl cation[HCNH]+ (g)[NH+]#C953.3949.3± 1.4kJ/mol28.03277 ±
4.4 Methyleneamidogen anion[CH2N]- (g)C=[N-]192.72188.97± 0.96kJ/mol28.03387 ±
3.6 AminomethylidyneCNH2 (g)[C]N371.9368.3± 1.1kJ/mol28.03332 ±
2.7 Carbon atomC (g)[C]711.407716.892± 0.048kJ/mol12.01070 ±

Most Influential reactions involving [HCNH]- (g)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Reaction Measured Quantity Reference
1.0002174.1 [HCNH]- (g) → [HCNH]- (g, trans) ΔrH°(0 K) = 0 ± 0 cm-1triv, Ruscic G3B3

References (for your convenience, also available in RIS and BibTex format)
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. 1.122d of the Thermochemical Network, Argonne National Laboratory (2018); available at
4   B. Ruscic,
Active Thermochemical Tables: Sequential Bond Dissociation Enthalpies of Methane, Ethane, and Methanol and the Related Thermochemistry.
J. Phys. Chem. A 119, 7810-7837 (2015) [DOI: 10.1021/acs.jpca.5b01346]
5   T. L. Nguyen, J. H. Baraban, B. Ruscic, and J. F. Stanton,
On the HCN – HNC Energy Difference.
J. Phys. Chem. A 119, 10929-10934 (2015) [DOI: 10.1021/acs.jpca.5b08406]
6   L. Cheng, J. Gauss, B. Ruscic, P. Armentrout, and J. Stanton,
Bond Dissociation Energies for Diatomic Molecules Containing 3d Transition Metals: Benchmark Scalar-Relativistic Coupled-Cluster Calculations for Twenty Molecules.
J. Chem. Theory Comput. 13, 1044-1056 (2017) [DOI: 10.1021/acs.jctc.6b00970]
7   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]

The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [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.

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.