Selected ATcT [1, 2] enthalpy of formation based on version 1.172 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.156 to include species relevant to a study of photodissociation of formamide[4].

Hydroxyl

Formula: OH (g)

CAS RN: 3352-57-6

ATcT ID: 3352-57-6*0

SMILES: [OH]

InChI: InChI=1S/HO/h1H

InChIKey: TUJKJAMUKRIRHC-UHFFFAOYSA-N

Hills Formula: H1O1

2D Image:

Aliases: OH; Hydroxyl; Oxidanyl; Hydroxyl radical; Hydroxy; Hydroxy radical; Hydroxide radical; Hydroxo radical; Oxygen hydride; Hydrogen oxide; HO

Relative Molecular Mass: 17.00734 ± 0.00031

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
37.274	37.514	± 0.022	kJ/mol

3D Image of OH (g)

spin ON spin OFF

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

The 20 contributors listed below account only for 64.8% of the provenance of Δ_fH° of OH (g).
A total of 306 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
29.5	125.2	1/2 O2 (g) + H2 (g) → H2O (cr,l)	Δ_rH°(298.15 K) = -285.8261 ± 0.040 kJ/mol	Rossini 1939, Rossini 1931, Rossini 1931b, note H2Oa, Rossini 1930
8.7	2373.7	CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -890.578 ± 0.078 kJ/mol	Schley 2010
7.9	2375.1	2 H2 (g) + C (graphite) → CH4 (g)	Δ_rG°(1165 K) = 37.521 ± 0.068 kJ/mol	Smith 1946, note COf, 3rd Law
2.0	115.11	H2O (g) → O (g) + 2 H (g)	Δ_rH°(0 K) = 917.80 ± 0.15 kJ/mol	Thorpe 2021
1.8	157.1	OH (g) → [OH]+ (g)	Δ_rH°(0 K) = 104989 ± 5 (×2.378) cm-1	Wiedmann 1992, note unc
1.5	167.6	H2O (g) → [OH]+ (g) + H (g)	Δ_rH°(0 K) = 18.1183 ± 0.0015 (×1.067) eV	Bodi 2014
1.4	152.1	OH (g) → O (g) + H (g)	Δ_rH°(0 K) = 35580 ± 15 cm-1	Sun 2020
1.3	1731.1	N2 (g) + 3 H2O (cr,l) + 2 H+ (aq) → 3/2 O2 (g) + 2 [NH4]+ (aq)	Δ_rH°(298.15 K) = 141.292 ± 0.119 kcal/mol	Vanderzee 1972c
1.2	169.1	[OH]- (g) → O- (g) + H (g)	Δ_rH°(0 K) = 4.7796 ± 0.0010 (×2) eV	Martin 2001, est unc
1.2	2373.4	CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -890.61 ± 0.21 kJ/mol	Dale 2002
1.1	2268.11	CO (g) → C (g) + O (g)	Δ_rH°(0 K) = 1071.92 ± 0.10 kJ/mol	Thorpe 2021
1.0	167.7	H2O (g) → [OH]+ (g) + H (g)	Δ_rH°(0 K) = 18.1190 ± 0.002 eV	Bodi 2014
0.8	167.5	H2O (g) → [OH]+ (g) + H (g)	Δ_rH°(0 K) = 18.1177 ± 0.0015 (×1.477) eV	Bodi 2014
0.7	2373.8	CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -890.482 ± 0.260 kJ/mol	Haloua 2015
0.7	2373.6	CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (cr,l)	Δ_rH°(298.15 K) = -890.44 ± 0.26 kJ/mol	GOMB Ref Calorimeter, Alexandrov 2002
0.7	175.1	[OH]+ (g) → O+ (g) + H (g)	Δ_rH°(0 K) = 40412.0 ± 2.2 cm-1	Moselhy 1975, note unc
0.7	2285.3	CO (g) + H2O (g) → CO2 (g) + H2 (g)	Δ_rG°(893 K) = -6.369 ± 0.283 kJ/mol	Meyer 1938, note COi, 3rd Law
0.5	1542.4	NNO (g) + CO (g) → CO2 (g) + N2 (g)	Δ_rH°(293.15 K) = -365.642 ± 0.243 kJ/mol	Fenning 1933, note N2Oa
0.5	2278.2	CO (g) → C+ (g) + O (g)	Δ_rH°(0 K) = 22.3713 ± 0.0015 eV	Ng 2007
0.5	225.4	HOOH (g) → 2 H (g) + 2 O (g)	Δ_rH°(0 K) = 1054.84 ± 0.56 kJ/mol	Harding 2008

Top 10 species with enthalpies of formation correlated to the Δ_fH° of OH (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
100.0	Hydroxyde	[OH]- (g)	-139.068	-139.034	± 0.022	kJ/mol	17.00789 ± 0.00031	14280-30-9*0
99.8	Water	H2O (g)	-238.907	-241.810	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*0
99.8	Water	H2O (g, para)	-238.907	-241.810	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*2
99.8	Water	H2O (g, ortho)	-238.622	-241.810	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*1
99.8	Oxonium	[H3O]+ (aq)		-285.804	± 0.022	kJ/mol	19.02267 ± 0.00037	13968-08-6*800
99.8	Water	H2O (cr,l)	-286.276	-285.804	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*500
99.8	Water	H2O (cr, l, eq.press.)	-286.278	-285.806	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*499
99.8	Water	H2O (l)		-285.804	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*590
99.8	Water	H2O (l, eq.press.)		-285.806	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*589
99.7	Water	H2O (cr)	-286.276	-292.717	± 0.022	kJ/mol	18.01528 ± 0.00033	7732-18-5*510

Most Influential reactions involving OH (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
0.972	364.10	HOOO (g) → OH (g) + O2 (g)	Δ_rG°(94.7 K) = 4.509 ± 0.128 kJ/mol	Le Picard 2010, 3rd Law, Tizniti 2010
0.915	244.1	HOOH (g) → 2 OH (g)	Δ_rH°(0 K) = 17051.8 ± 3.4 cm-1	Luo 1992
0.834	159.1	[OH]- (g) → OH (g)	Δ_rH°(0 K) = 14740.982 ± 0.014 cm-1	Goldfarb 2005, note unc, Delsart 2002
0.720	1040.1	HOCl (g) → OH (g) + Cl (g)	Δ_rH°(0 K) = 19287.9 ± 0.7 cm-1	Barnes 1997
0.701	210.3	(H2O)2 (g) → [H3O]+ (g) + OH (g)	Δ_rH°(0 K) = 11.7556 ± 0.0020 eV	Bodi 2014
0.609	164.3	H2O (g) → OH (g) + H (g)	Δ_rH°(0 K) = 41145.92 ± 0.12 cm-1	Boyarkin 2013
0.394	2098.1	HOONO (g, cis, cis) → OH (g) + ONO (g)	Δ_rH°(450 K) = 86.08 ± 0.54 kJ/mol	Golden 2003, Hippler 2002, 3rd Law
0.389	164.2	H2O (g) → OH (g) + H (g)	Δ_rH°(0 K) = 41145.94 ± 0.15 cm-1	Maksyutenko 2006
0.363	5056.2	CH3C(O)OH (g) → OH (g) + [CH3CO]+ (g)	Δ_rH°(0 K) = 11.641 ± 0.008 eV	Shuman 2010
0.341	2013.6	HOON (g, trans) → OH (g) + NO (g)	Δ_rH°(0 K) = 25.6 ± 4 kJ/mol	Talipov 2013, est unc
0.277	1040.2	HOCl (g) → OH (g) + Cl (g)	Δ_rH°(0 K) = 19289.4 ± 0.7 (×1.61) cm-1	Wedlock 1997
0.220	4907.10	(OH)(CO) (g, vdW) → OH (g) + CO (g)	Δ_rH°(0 K) = 310 ± 150 cm-1	Pond 2003, Marshall 2003, est unc
0.220	4907.9	(OH)(CO) (g, vdW) → OH (g) + CO (g)	Δ_rH°(0 K) = 330 ± 150 cm-1	Lester 2001, est unc
0.204	1269.1	HOBr (g) + Cl (g) → BrCl (g) + OH (g)	Δ_rG°(298.15 K) = -10.14 ± 1.04 kJ/mol	Loewenstein 1984, Kukui 1996, Monks 1993a, Loewenstein 1984
0.191	4905.4	HCO (g) + 2 OH (g) → HCOO (g, cis) + H2O (g)	Δ_rH°(0 K) = -1.93 ± 1.60 kcal/mol	Ruscic G4
0.172	4604.6	CH2(OH)O (g, gauche) → CH2O (g) + OH (g)	Δ_rH°(0 K) = 90.51 ± 2.0 kJ/mol	Klippenstein 2017
0.166	4905.3	HCO (g) + 2 OH (g) → HCOO (g, cis) + H2O (g)	Δ_rH°(0 K) = -2.69 ± 1.72 kcal/mol	Ruscic G3X
0.161	9780.4	CH3S(OH)CH3 (g) → CH3SCH3 (g) + OH (g)	Δ_rH°(0 K) = 8.80 ± 1.50 kcal/mol	Ruscic W1RO
0.159	159.3	[OH]- (g) → OH (g)	Δ_rH°(0 K) = 14741.02 ± 0.03 (×1.067) cm-1	Smith 1997
0.155	710.9	FOOF (g) + 2 OH (g) → HOOH (g) + 2 FO (g)	Δ_rH°(0 K) = -4.55 ± 0.25 kcal/mol	Karton 2009c

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. 1.172 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		K. L. Caster, N. A. Seifert, B. Ruscic, A. W. Jasper, and K. Prozument, Dynamics of HCN, NHC, and HNCO Formation in the 193 nm Photodissociation of Formamide J. Phys. Chem. A (in press) (2024) [DOI: 10.1021/acs.jpca.4c02232]
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.