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.
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Vibrational and/or electronic energy levels
  • References
  • Notes
• Other data available:
  • Gas phase ion energetics data
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
• Options:
  • Switch to calorie-based units

Gas phase thermochemistry data

Go To: Top, Vibrational and/or electronic energy levels, References, Notes

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 (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Vibrational and/or electronic energy levels

Go To: Top, Gas 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 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, Vibrational and/or electronic energy levels, 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]

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]

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]

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

Go To: Top, Gas phase thermochemistry data, Vibrational and/or electronic energy levels, References

• Symbols used in this document:
  

  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
• The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
• Customer support for NIST Standard Reference Data products.