Selected ATcT [1, 2] enthalpy of formation based on version 1.202 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.176 in order to include species related to the thermochemistry of glycine[4].

Glycine

Formula: NH2CH2C(O)OH (aq, undissoc)

CAS RN: 56-40-6

ATcT ID: 56-40-6*1000

SMILES: NCC(=O)O

InChI: InChI=1S/C2H5NO2/c3-1-2(4)5/h1,3H2,(H,4,5)

InChIKey: DHMQDGOQFOQNFH-UHFFFAOYSA-N

Hills Formula: C2H5N1O2

2D Image:

Aliases: NH2CH2C(O)OH; Glycine; 2-Aminoacetic acid; Aminoacetic acid; Aminoethanoic acid; alpha-Glycine; beta-Glycine; gamma-Glycine; Aminomethanecarboxylic acid; Aciport; Glicoamin; Glycocoll; Glycolixir; Glycosthene; Padil; Amitone; Athenon; Gly; Gyn-hydralin; Corilin; NSC 25936

Relative Molecular Mass: 75.0666 ± 0.0017

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
	-514.22	± 0.20	kJ/mol

Top contributors to the provenance of Δ_fH° of NH2CH2C(O)OH (aq, undissoc)

The 5 contributors listed below account for 90.5% of the provenance of Δ_fH° of NH2CH2C(O)OH (aq, undissoc).

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
66.1	7682.1	2 NH2CH2C(O)OH (cr, alpha) + 9/2 O2 (g) → 4 CO2 (g) + 5 H2O (cr,l) + N2 (g)	Δ_rH°(298.15 K) = -1945.95 ± 0.44 kJ/mol	Ngauv 1977
18.2	7682.3	2 NH2CH2C(O)OH (cr, alpha) + 9/2 O2 (g) → 4 CO2 (g) + 5 H2O (cr,l) + N2 (g)	Δ_rH°(298.15 K) = -465.14 ± 0.20 kcal/mol	Huffman 1937
3.0	7682.2	2 NH2CH2C(O)OH (cr, alpha) + 9/2 O2 (g) → 4 CO2 (g) + 5 H2O (cr,l) + N2 (g)	Δ_rH°(298.15 K) = -1948.2 ± 1.0 (×2.044) kJ/mol	Vasilev 1991, Vasilev 1991a, as quoted by NIST WebBook
2.0	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
0.9	2376.1	2 H2 (g) + C (graphite) → CH4 (g)	Δ_rG°(1165 K) = 37.521 ± 0.068 kJ/mol	Smith 1946, note COf, 3rd Law

Top 10 species with enthalpies of formation correlated to the Δ_fH° of NH2CH2C(O)OH (aq, undissoc)

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
99.9	Glycine	NH2CH2C(O)OH (cr, alpha)	-508.27	-528.37	± 0.20	kJ/mol	75.0666 ± 0.0017	56-40-6*511
98.0	Glycinate	[NH2CH2C(O)O]- (aq)		-470.09	± 0.21	kJ/mol	74.0592 ± 0.0017	23297-34-9*800
98.0	Glycine	NH2CH2C(O)OH (aq)		-470.09	± 0.21	kJ/mol	75.0666 ± 0.0017	56-40-6*800
98.0	Glycine	NH2CH2C(O)OH (aq, 100000 H2O)		-470.09	± 0.21	kJ/mol	75.0666 ± 0.0017	56-40-6*861
96.1	Glycine	NH2CH2C(O)OH (aq, 300 H2O)		-470.16	± 0.21	kJ/mol	75.0666 ± 0.0017	56-40-6*831
96.1	Glycine	NH2CH2C(O)OH (aq, 100 H2O)		-470.30	± 0.21	kJ/mol	75.0666 ± 0.0017	56-40-6*828
96.1	Glycine	NH2CH2C(O)OH (aq, 75 H2O)		-470.37	± 0.21	kJ/mol	75.0666 ± 0.0017	56-40-6*825
96.1	Glycine	NH2CH2C(O)OH (aq, 30 H2O)		-470.67	± 0.21	kJ/mol	75.0666 ± 0.0017	56-40-6*820
96.1	Glycine	NH2CH2C(O)OH (aq, 25 H2O)		-470.76	± 0.21	kJ/mol	75.0666 ± 0.0017	56-40-6*819
96.1	Glycine	NH2CH2C(O)OH (aq, 700 H2O)		-470.12	± 0.21	kJ/mol	75.0666 ± 0.0017	56-40-6*835

Most Influential reactions involving NH2CH2C(O)OH (aq, undissoc)

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
0.658	7686.1	NH2CH2C(O)OH (cr, alpha) → NH2CH2C(O)OH (aq, undissoc)	Δ_rG°(298.15 K) = -2.21131 ± 0.006 kJ/mol	Rowland 2018
0.636	7694.1	NH2CH2C(O)OH (aq, undissoc) → [NH2CH2C(O)O]- (aq) + H+ (aq)	Δ_rG°(298.15 K) = 55.78 ± 0.050 kJ/mol	Hamborg 2007, est unc
0.449	7722.1	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rG°(298.15 K) = 3.206 ± 0.025 kcal/mol	King 1951a, est unc
0.237	7686.4	NH2CH2C(O)OH (cr, alpha) → NH2CH2C(O)OH (aq, undissoc)	Δ_rH°(298.15 K) = 14.16 ± 0.01 kJ/mol	Spink 1975, Miller 1990
0.159	7694.3	NH2CH2C(O)OH (aq, undissoc) → [NH2CH2C(O)O]- (aq) + H+ (aq)	Δ_rG°(298.15 K) = 55.810 ± 0.1 kJ/mol	Datta 1958, Datta 1958a, est unc
0.145	7694.5	NH2CH2C(O)OH (aq, undissoc) → [NH2CH2C(O)O]- (aq) + H+ (aq)	Δ_rG°(298.15 K) = 13.340 ± 0.025 kcal/mol	King 1951a, est unc
0.123	7722.7	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rH°(298.15 K) = 4.1 ± 0.2 kJ/mol	Wu 1990, est unc
0.123	7722.8	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rG°(298.15 K) = 13.4 ± 0.2 kJ/mol	Wu 1990, est unc
0.112	7722.5	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rG°(298.15 K) = 3.2068 ± 0.05 kcal/mol	King 1945, est unc
0.112	7722.3	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rG°(298.15 K) = 3.207 ± 0.05 kcal/mol	Owen 1934, est unc
0.059	7686.10	NH2CH2C(O)OH (cr, alpha) → NH2CH2C(O)OH (aq, undissoc)	Δ_rH°(298.15 K) = 14.17 ± 0.02 kJ/mol	Qiu 2009
0.039	7694.7	NH2CH2C(O)OH (aq, undissoc) → [NH2CH2C(O)O]- (aq) + H+ (aq)	Δ_rG°(298.15 K) = 55.80 ± 0.2 kJ/mol	Owen 1934, est unc
0.028	7722.6	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rH°(298.15 K) = 0.958 ± 0.10 kcal/mol	King 1945, est unc
0.019	7722.10	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rG°(298.15 K) = 13.47 ± 0.50 kJ/mol	Isaeva 2018, est unc
0.019	7722.2	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rH°(298.15 K) = 0.953 ± 0.12 kcal/mol	King 1951a, est unc
0.014	7686.3	NH2CH2C(O)OH (cr, alpha) → NH2CH2C(O)OH (aq, undissoc)	Δ_rG°(298.15 K) = -2.22 ± 0.04 kJ/mol	Miller 1990
0.009	7686.8	NH2CH2C(O)OH (cr, alpha) → NH2CH2C(O)OH (aq, undissoc)	Δ_rH°(298.15 K) = 14.17 ± 0.05 kJ/mol	Korolev 2007, Korolev 2007a
0.007	7722.9	[NH3CH2C(O)OH]+ (aq) → NH2CH2C(O)OH (aq, undissoc) + H+ (aq)	Δ_rH°(298.15 K) = 4.57 ± 0.80 kJ/mol	Isaeva 2018
0.006	7686.7	NH2CH2C(O)OH (cr, alpha) → NH2CH2C(O)OH (aq, undissoc)	Δ_rH°(298.15 K) = 14.20 ± 0.06 kJ/mol	Palecz 1998, Palecz 1990
0.006	7686.15	NH2CH2C(O)OH (cr, alpha) → NH2CH2C(O)OH (aq, undissoc)	Δ_rH°(298.15 K) = 14.12 ± 0.06 kJ/mol	Kelley 1978

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. 1.202 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		B. Ruscic and D. H. Bross Accurate and Reliable Thermochemistry by Data Analysis of Complex Thermochemical Networks using Active Thermochemical Tables: The Case of Glycine Thermochemistry Faraday Discuss. (in press) (2024) [DOI: 10.1039/D4FD00110A]
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.