CNN Radical

• Formula: CN₂
• Molecular weight: 40.0241
• IUPAC Standard InChI: InChI=1S/CN2/c1-3-2 Copy

  
• IUPAC Standard InChIKey: QDZARNQKIZUXDK-UHFFFAOYSA-N Copy
• CAS Registry Number: 2468-81-7
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
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• Information on this page:
  • Gas phase thermochemistry data
  • Gas phase ion energetics data
  • Vibrational and/or electronic energy levels
  • References
  • Notes
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Gas 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.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Gas phase ion energetics 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: John E. Bartmess

Electron affinity determinations

Vibrational and/or electronic energy levels

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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: Marilyn E. Jacox

State:   ?

State:   C

State:   B

State:   A

State:   b

State:   a

State:   X

Additional references: Jacox, 1994, page 71; Jacox, 2003, page 114; Wasserman, Barash, et al., 1965

Notes

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, NIST Free Links, 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]

Clifford, Wenthold, et al., 1998
Clifford, E.P.; Wenthold, P.G.; Lineberger, W.C.; Peterssom, G.A.; Broaddus, K.M.; Kass, S.R.; Kato, S., Properties of Diazocarbene [CNN] and the diazomethyl Radical [HCNN] via Ion Chemistry and Spectroscopy, J. Phys. Chem. A, 1998, 102, 36, 7100, https://doi.org/10.1021/jp9802735 . [all data]

Jacox, 1978
Jacox, M.E., Matrix isolation study of the reaction of carbon atoms with molecular nitrogen, J. Mol. Spectrosc., 1978, 72, 1, 26, https://doi.org/10.1016/0022-2852(78)90040-1 . [all data]

Bise, Hoops, et al., 2000
Bise, R.T.; Hoops, A.A.; Choi, H.; Neumark, D.M., Photodissociation dynamics of the CNN free radical, J. Chem. Phys., 2000, 113, 10, 4179, https://doi.org/10.1063/1.1288267 . [all data]

Braun, Bass, et al., 1969
Braun, W.; Bass, A.M.; Davis, D.D.; Simmons, J.D., Flash Photolysis of Carbon Suboxide: Absolute Rate Constants for Reactions of C(FormulaP) and C(Formula) with HFormula, NFormula, CO, NO, OFormula and CHFormula, Proc. Roy. Soc. (London) A312, 1969, 312, 1510, 417, https://doi.org/10.1098/rspa.1969.0168 . [all data]

Curtis, Levick, et al., 1988
Curtis, M.C.; Levick, A.P.; Sarre, P.J., Laser-Induced-Fluorescence Spectrum of the CNN Molecule, Laser Chem., 1988, 9, 4-6, 359, https://doi.org/10.1155/LC.9.359 . [all data]

Weltner and McLeod, 1966
Weltner, W., Jr.; McLeod, D., Jr., Spectroscopy of Carbon Vapor Condensed in Rare-Gas Matrices at 4°K. III, J. Chem. Phys., 1966, 45, 8, 3096, https://doi.org/10.1063/1.1728066 . [all data]

Milligan, Jacox, et al., 1965
Milligan, D.E.; Jacox, M.E.; Bass, A.M., Matrix Isolation Study of the Photolysis of Cyanogen Azide. The Infrared and Ultraviolet Spectra of the Free Radical NCN, J. Chem. Phys., 1965, 43, 9, 3149, https://doi.org/10.1063/1.1697289 . [all data]

Milligan and Jacox, 1966
Milligan, D.E.; Jacox, M.E., Matrix-Isolation Study of the Infrared and Ultraviolet Spectra of the Free Radical CNN, J. Chem. Phys., 1966, 44, 8, 2850, https://doi.org/10.1063/1.1727144 . [all data]

Bondybey and English, 1977
Bondybey, V.E.; English, J.H., Spectroscopy and vibrational relaxation of CNN in rare gas solids, J. Chem. Phys., 1977, 67, 2, 664, https://doi.org/10.1063/1.434869 . [all data]

Wilkerson and Guillory, 1977
Wilkerson, J.L.; Guillory, W.A., Laser-induced temporal and wavelength resolved spectroscopy of the 3Π-3Σ- system of matrix-isolated CNN, J. Mol. Spectrosc., 1977, 66, 2, 188, https://doi.org/10.1016/0022-2852(77)90209-0 . [all data]

Moll and Thompson, 1966
Moll, N.G.; Thompson, W.E., Reactions of Carbon Atoms with N2, H2, and D2 at 4.2°K, J. Chem. Phys., 1966, 44, 7, 2684, https://doi.org/10.1063/1.1727111 . [all data]

DeKock and Weltner, 1971
DeKock, R.L.; Weltner, W., Jr., C2O, CN2, and C3O molecules, J. Am. Chem. Soc., 1971, 93, 25, 7106, https://doi.org/10.1021/ja00754a081 . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 2003
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

Wasserman, Barash, et al., 1965
Wasserman, E.; Barash, L.; Yager, W.A., None, J. Am. Chem. Soc., 1965, 87, 9, 2075, https://doi.org/10.1021/ja01087a058 . [all data]

Notes

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• Symbols used in this document:
  

  EA	Electron affinity
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔfH°gas	Enthalpy of formation of gas at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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