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Cyanogen

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Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Reaction thermochemistry data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Deltafgas309.07kJ/molReviewChase, 1998Data last reviewed in March, 1961
Deltafgas308.9 ± 1.8kJ/molCcbKnowlton and Prosen, 1951ALS
Deltafgas263.kJ/molCmMcMorris and Badger, 1933ALS
Deltafgas306.7 ± 0.84kJ/molCcbWartenberg and Schutza, 1933Reanalyzed by Cox and Pilcher, 1970, Original value = 305. ± 0.8 kJ/mol; ALS
Quantity Value Units Method Reference Comment
Deltacgas-1096.0 ± 1.8kJ/molCcbKnowlton and Prosen, 1951ALS
Deltacgas-1051.9 ± 5.0kJ/molCmMcMorris and Badger, 1933ALS
Deltacgas-1093.7 ± 0.84kJ/molCcbWartenberg and Schutza, 1933Reanalyzed by Cox and Pilcher, 1970, Original value = -1093. ± 0.8 kJ/mol; ALS
Quantity Value Units Method Reference Comment
gas,1 bar241.57J/mol*KReviewChase, 1998Data last reviewed in March, 1961

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. - 1300.1300. - 6000.
A 51.6929083.01014
B 36.793512.209166
C -12.46154-0.419735
D 0.7018030.027676
E -0.428743-9.308648
F 290.6951264.0342
G 291.2884315.7192
H 309.0725309.0725
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in March, 1961 Data last reviewed in March, 1961

Condensed phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
liquid138.83J/mol*KN/ARuehrwein and Giauque, 1939 

Constant pressure heat capacity of liquid

Cp,liquid (J/mol*K) Temperature (K) Reference Comment
105.73255.Ruehrwein and Giauque, 1939T = 15 to 252 K.

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

NH4+ + Cyanogen = (NH4+ bullet Cyanogen)

By formula: H4N+ + C2N2 = (H4N+ bullet C2N2)

Quantity Value Units Method Reference Comment
Deltar43.5kJ/molPHPMSSpeller and Meot-Ner (Mautner), 1985gas phase; Entropy change calculated or estimated, DG<, «DELTA»rH<; M
Quantity Value Units Method Reference Comment
Deltar96.J/mol*KN/ASpeller and Meot-Ner (Mautner), 1985gas phase; Entropy change calculated or estimated, DG<, «DELTA»rH<; M

Free energy of reaction

DeltarG° (kJ/mol) T (K) Method Reference Comment
13.315.PHPMSSpeller and Meot-Ner (Mautner), 1985gas phase; Entropy change calculated or estimated, DG<, «DELTA»rH<; M

Cyanogen + Ethane, hexafluoro- = 2Acetonitrile, trifluoro-

By formula: C2N2 + C2F6 = 2C2F3N

Quantity Value Units Method Reference Comment
Deltar44.10 ± 0.59kJ/molEqkWalker, Sinke, et al., 1970gas phase; ALS

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Knowlton and Prosen, 1951
Knowlton, J.W.; Prosen, E.J., Heat of combustion and formation of cyanogen, J. Res. NBS, 1951, 46, 489-495. [all data]

McMorris and Badger, 1933
McMorris, J.; Badger, R.M., The heat of combustion, entropy and free energy of cyanogen gas, J. Am. Chem. Soc., 1933, 55, 1952-1957. [all data]

Wartenberg and Schutza, 1933
Wartenberg, H.V.; Schutza, H., Die verbrennungswarme des cyans, Z. Phys. Chem., 1933, 164, 386-388. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Ruehrwein and Giauque, 1939
Ruehrwein, R.A.; Giauque, W.F., The entropy of cyanogen. Heat capacity and vapor pressure of solid and liquid. Heats of fusion and vaporization, J. Am. Chem. Soc., 1939, 61, 2940-2944. [all data]

Speller and Meot-Ner (Mautner), 1985
Speller, C.V.; Meot-Ner (Mautner), M., The Ionic Hydrogen Bond and Ion Solvation. 3. Bonds Involving Cyanides. Correlations with Proton Affinites, J. Phys. Chem., 1985, 81, 24, 5217, https://doi.org/10.1021/j100270a020 . [all data]

Walker, Sinke, et al., 1970
Walker, L.C.; Sinke, G.C.; Perettie, D.J.; Janz, G.J., Enthalpy of formation of trifluoroacetonitrile, J. Am. Chem. Soc., 1970, 92, 4525-4526. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, References