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].

Nitrogen sesquioxide

Formula: ONN(O)O (g)

CAS RN: 10544-73-7

ATcT ID: 10544-73-7*0

SMILES: O=N-[N](=O)[O]

InChI: InChI=1S/N2O3/c3-1-2(4)5

InChIKey: LZDSILRDTDCIQT-UHFFFAOYSA-N

Hills Formula: N2O3

2D Image:

Aliases: ONN(O)O; Nitrogen sesquioxide; N-Oxonitramide; Dinitrogen trioxide; asym-Dinitrogen trioxide; Nitrogen trioxide; Nitrous anhydride; asym-N2O3; O2NNO; ONNO2

Relative Molecular Mass: 76.01168 ± 0.00091

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
90.74	86.17	± 0.15	kJ/mol

3D Image of ONN(O)O (g)

spin ON spin OFF

Top contributors to the provenance of Δ_fH° of ONN(O)O (g)

The 20 contributors listed below account only for 82.5% of the provenance of Δ_fH° of ONN(O)O (g).
A total of 44 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
18.3	1469.1	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52400 ± 10 cm-1	Callear 1970
18.3	1469.2	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52400 ± 10 cm-1	Dingle 1975
15.3	1561.10	ONN(O)O (g) → NO (g) + ONO (g)	Δ_rG°(300 K) = -1.84 ± 0.07 kJ/mol	Beattie 1957, 3rd Law, apud Gurvich TPIS
12.9	1469.4	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52408 ± 10 (×1.189) cm-1	Kley 1973, Miescher 1974, est unc
3.1	1469.3	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 52420 ± 12 (×2) cm-1	Miescher 1974, Huber 1979
1.8	1422.3	N2 (g) → N+ (g) + N (g)	Δ_rH°(0 K) = 24.2880 ± 0.0009 eV	Tang 2005
1.5	1422.1	N2 (g) → N+ (g) + N (g)	Δ_rH°(0 K) = 24.2888 ± 0.0010 eV	Tang 2005
1.5	1422.2	N2 (g) → N+ (g) + N (g)	Δ_rH°(0 K) = 24.2883 ± 0.0010 eV	Tang 2005
1.5	1711.3	(NH4)NO3 (cr,l) → N2 (g) + 1/2 O2 (g) + 2 H2O (cr,l)	Δ_rH°(293.65 K) = -49.44 ± 0.06 kcal/mol	Becker 1934
1.1	1561.2	ONN(O)O (g) → NO (g) + ONO (g)	Δ_rG°(263.15 K) = 3.429 ± 0.255 kJ/mol	Solc 1967, 3rd Law
0.9	1561.4	ONN(O)O (g) → NO (g) + ONO (g)	Δ_rG°(298.15 K) = -1.85 ± 0.15 (×1.834) kJ/mol	Vosper 1976, 3rd Law, apud Gurvich TPIS
0.8	1472.4	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 626.47 ± 0.56 kJ/mol	Harding 2008
0.7	1986.3	ONN(O)O (g) + H2O (g) → 2 HONO (g)	Δ_rG°(298.15 K) = -3.26 ± 0.15 (×2.044) kJ/mol	Vosper 1976, 3rd Law
0.6	1471.10	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 149.82 ± 0.15 kcal/mol	Karton 2007a, Karton 2008
0.6	1399.11	N2 (g) → 2 N (g)	Δ_rH°(0 K) = 941.14 ± 0.15 kJ/mol	Thorpe 2021
0.6	1469.6	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 6.503 ± 0.004 (×1.682) eV	Brewer 1956, Frisch 1965
0.5	1470.10	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 149.78 ± 0.16 kcal/mol	Feller 2014
0.5	1938.4	HNO (g) → H (g) + N (g) + O (g)	Δ_rH°(0 K) = 823.10 ± 0.56 kJ/mol	Harding 2008
0.5	1472.2	NO (g) → N (g) + O (g)	Δ_rH°(0 K) = 626.74 ± 0.70 kJ/mol	Harding 2008
0.5	1945.4	HNO (g) → H (g) + NO (g)	Δ_rH°(0 K) = 16450 ± 10 cm-1	Dixon 1981, Dixon 1984, Dixon 1996

Top 10 species with enthalpies of formation correlated to the Δ_fH° of ONN(O)O (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
89.7	Nitrogen dioxide	ONO (g)	36.867	34.060	± 0.065	kJ/mol	46.00554 ± 0.00060	10102-44-0*0
89.7	Nitric oxide	NO (g)	90.628	91.132	± 0.065	kJ/mol	30.00614 ± 0.00031	10102-43-9*0
89.6	Nitrosyl ion	[NO]+ (g)	984.496	984.490	± 0.065	kJ/mol	30.00559 ± 0.00031	14452-93-8*0
87.2	Dinitrogen tetraoxide	O2NNO2 (g)	20.17	10.88	± 0.14	kJ/mol	92.0111 ± 0.0012	10544-72-6*0
86.6	Nitrosyl chloride	ClNO (g)	54.462	52.560	± 0.067	kJ/mol	65.45884 ± 0.00095	2696-92-6*0
84.5	Dioxohydrazine	ONNO (g)	172.91	171.15	± 0.14	kJ/mol	60.01228 ± 0.00062	16824-89-8*0
84.5	Dioxohydrazine	ONNO (g, cis)	172.91	171.15	± 0.14	kJ/mol	60.01228 ± 0.00062	16824-89-8*2
75.4	Nitrous acid	HONO (g)	-72.985	-78.642	± 0.078	kJ/mol	47.01348 ± 0.00061	7782-77-6*0
75.4	Nitrous acid	HONO (g, trans)	-72.985	-79.128	± 0.078	kJ/mol	47.01348 ± 0.00061	7782-77-6*1
73.7	Nitric oxide	NO (aq, undissoc)		79.219	± 0.078	kJ/mol	30.00614 ± 0.00031	10102-43-9*1000

Most Influential reactions involving ONN(O)O (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
0.799	1561.10	ONN(O)O (g) → NO (g) + ONO (g)	Δ_rG°(300 K) = -1.84 ± 0.07 kJ/mol	Beattie 1957, 3rd Law, apud Gurvich TPIS
0.463	1553.3	ONN(O)O (g) → [ONN(O)O]+ (g, vdW)	Δ_rH°(0 K) = 9.660 ± 0.073 eV	Ruscic G4
0.285	1553.2	ONN(O)O (g) → [ONN(O)O]+ (g, vdW)	Δ_rH°(0 K) = 9.765 ± 0.093 eV	Ruscic G3X
0.269	1576.9	ONN(O)O (g) → ONONO (g, t, t)	Δ_rH°(0 K) = 294 ± 200 cm-1	Ruscic ab initio
0.251	1553.4	ONN(O)O (g) → [ONN(O)O]+ (g, vdW)	Δ_rH°(0 K) = 9.741 ± 0.099 eV	Ruscic CBS-n
0.196	1555.7	[ONN(O)O]- (g, non-vdW) → ONN(O)O (g)	Δ_rH°(0 K) = 1.894 ± 0.050 eV	Ruscic W1RO
0.171	1592.8	ONN(O)O (g) → N(O3)N (g)	Δ_rH°(0 K) = 122.03 ± 1.2 kcal/mol	Ruscic W1RO
0.165	1586.4	ONN(OO) (g, trans) + ONO (g) → ONN(O)O (g) + N(OO) (g)	Δ_rH°(0 K) = -1.16 ± 0.9 kcal/mol	Ruscic W1RO
0.146	1592.7	ONN(O)O (g) → N(O3)N (g)	Δ_rH°(0 K) = 123.08 ± 1.3 kcal/mol	Ruscic CBS-n
0.146	1592.4	ONN(O)O (g) → N(O3)N (g)	Δ_rH°(0 K) = 121.96 ± 1.3 kcal/mol	Ruscic G4
0.140	1554.6	[ONN(O)O]- (g, vdW) → ONN(O)O (g)	Δ_rH°(0 K) = 2.005 ± 0.050 eV	Ruscic W1RO
0.134	1586.3	ONN(OO) (g, trans) + ONO (g) → ONN(O)O (g) + N(OO) (g)	Δ_rH°(0 K) = -0.46 ± 1.0 kcal/mol	Ruscic CBS-n
0.134	1586.2	ONN(OO) (g, trans) + ONO (g) → ONN(O)O (g) + N(OO) (g)	Δ_rH°(0 K) = -0.95 ± 1.0 kcal/mol	Ruscic G4
0.131	1555.4	[ONN(O)O]- (g, non-vdW) → ONN(O)O (g)	Δ_rH°(0 K) = 1.830 ± 0.061 eV	Ruscic G4
0.125	1592.3	ONN(O)O (g) → N(O3)N (g)	Δ_rH°(0 K) = 122.61 ± 1.4 kcal/mol	Ruscic G3X
0.122	1585.4	ONN(OO) (g, trans) → ONN(O)O (g)	Δ_rH°(0 K) = -77.05 ± 1.2 kcal/mol	Ruscic W1RO
0.110	1586.1	ONN(OO) (g, trans) + ONO (g) → ONN(O)O (g) + N(OO) (g)	Δ_rH°(0 K) = -1.12 ± 1.1 kcal/mol	Ruscic G3X
0.110	1986.3	ONN(O)O (g) + H2O (g) → 2 HONO (g)	Δ_rG°(298.15 K) = -3.26 ± 0.15 (×2.044) kJ/mol	Vosper 1976, 3rd Law
0.104	1585.3	ONN(OO) (g, trans) → ONN(O)O (g)	Δ_rH°(0 K) = -77.09 ± 1.3 kcal/mol	Ruscic CBS-n
0.104	1585.2	ONN(OO) (g, trans) → ONN(O)O (g)	Δ_rH°(0 K) = -76.96 ± 1.3 kcal/mol	Ruscic G4

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.