Silicon dicarbide

• Formula: C₂Si
• Molecular weight: 52.1069
• CAS Registry Number: 12071-27-1
• 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 as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

Electron affinity determinations

Ionization energy 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:   A

State:   X

Additional references: Jacox, 1994, page 66; Jacox, 1998, page 170; Michalopoulos, Geusic, et al., 1984; Thaddeus, Cummins, et al., 1984; Snyder, Henkel, et al., 1985; Suenram, Lovas, et al., 1989; Coudert, 1993; Ross, Butenhoff, et al., 1994

Notes

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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]

Nakajima, Taguwa, et al., 1995
Nakajima, A.; Taguwa, T.; Nakao, K.; Gomei, M.; Kishi, R.; Iwata, S.; Kaya, K., Photoelectron Spectroscopy of silicon-carbon cluster Anions (SinCm-), J. Chem. Phys., 1995, 103, 6, 2050, https://doi.org/10.1063/1.469731 . [all data]

Stearns and Kohl, 1973
Stearns, C.A.; Kohl, F.J., Mass spectrometric determination of the dissociation energies of gaseous Al₂, AlSi, and AlSiO, High Temp. Sci., 1973, 5, 113. [all data]

Guido and Gigli, 1973
Guido, M.; Gigli, G., Mass spectrometric study of the CeSiC molecules, J. Chem. Phys., 1973, 59, 3437. [all data]

Drowart, DeMaria, et al., 1958
Drowart, J.; DeMaria, G.; Inghram, M.G., Thermodynamic study of SiC utilizing a mass spectrometer, J. Chem. Phys., 1958, 29, 1015. [all data]

Kleman, 1956
Kleman, B., Laboratory Excitation of the Blue-Green Bands Observed in the Spectra of N-Type Stars., Astrophys. J., 1956, 123, 162, https://doi.org/10.1086/146142 . [all data]

Verma and Nagaraj, 1974
Verma, R.D.; Nagaraj, S., Can. J. Phys., 1974, 52, 1938. [all data]

Bondybey, 1982
Bondybey, V.E., Laser vaporization of silicon carbide. Lifetime and spectroscopy of silicon carbide (SiC2), J. Phys. Chem., 1982, 86, 17, 3396, https://doi.org/10.1021/j100214a026 . [all data]

Bredohl, Dubois, et al., 1988
Bredohl, H.; Dubois, I.; Leclercq, H.; Melen, F., Rotational analysis of the 000-000 and 010-000 bands of SiC2, J. Mol. Spectrosc., 1988, 128, 2, 399, https://doi.org/10.1016/0022-2852(88)90156-7 . [all data]

Butenhoff and Rohlfing, 1991
Butenhoff, T.J.; Rohlfing, E.A., Laser-induced fluorescence spectroscopy of jet-cooled SiC2, J. Chem. Phys., 1991, 95, 1, 1, https://doi.org/10.1063/1.461476 . [all data]

Weltner and McLeod, 1964
Weltner, W., Jr.; McLeod, D., Jr., Spectroscopy of Silicon Carbide and Silicon Vapors Trapped in Neon and Argon Matrices at 4° and 20°K, J. Chem. Phys., 1964, 41, 1, 235, https://doi.org/10.1063/1.1725627 . [all data]

Shepherd and Graham, 1986
Shepherd, R.A.; Graham, W.R.M., Proc. 17th Internatl. Sympos. on Free Radicals, 1986, Natl. Bur. Stand. Special Publ. 716. [all data]

Shepherd and Graham, 1985
Shepherd, R.A.; Graham, W.R.M., FTIR matrix isolation study of carbon-13 substituted SiC2, J. Chem. Phys., 1985, 82, 11, 4788, https://doi.org/10.1063/1.448696 . [all data]

Presilla-Marquez, Graham, et al., 1990
Presilla-Marquez, J.D.; Graham, W.R.M.; Shepherd, R.A., Fourier transform far infrared spectroscopy of the ν'3 vibration of SiC2 in Ar at 10 K, J. Chem. Phys., 1990, 93, 8, 5424, https://doi.org/10.1063/1.459638 . [all data]

Shepherd and Graham, 1988
Shepherd, R.A.; Graham, W.R.M., Some implications from matrix studies for the structure and vibrational assignments of SiC2, J. Chem. Phys., 1988, 88, 5, 3399, https://doi.org/10.1063/1.453938 . [all data]

Gottlieb, Vrtilek, et al., 1989
Gottlieb, C.A.; Vrtilek, J.M.; Thaddeus, P., Laboratory Measurement of the Rotational Spectrum of SiCC, Astrophys. J., 1989, 343, L29, https://doi.org/10.1086/185503 . [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, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Michalopoulos, Geusic, et al., 1984
Michalopoulos, D.L.; Geusic, M.E.; Langridge-Smith, P.R.R.; Smalley, R.E., Visible spectroscopy of jet-cooled SiC2: Geometry and electronic structure, J. Chem. Phys., 1984, 80, 8, 3556, https://doi.org/10.1063/1.447201 . [all data]

Thaddeus, Cummins, et al., 1984
Thaddeus, P.; Cummins, S.E.; Linke, R.A., Identification of the SiCC radical toward IC +10216 - The first molecular ring in an astronomical source, Astrophys. J., 1984, 283, L45, https://doi.org/10.1086/184330 . [all data]

Snyder, Henkel, et al., 1985
Snyder, L.E.; Henkel, C.; Hollis, J.M.; Lovas, F.J., Observations of the SiC2 radical toward IRC + 10216 at 1.27 centimeters, Astrophys. J., 1985, 290, L29, https://doi.org/10.1086/184436 . [all data]

Suenram, Lovas, et al., 1989
Suenram, R.D.; Lovas, F.J.; Matsumura, K., Laboratory measurement of the 1(01)-0(00) transition and electric dipole moment of SiC2, Astrophys. J., 1989, 342, L103, https://doi.org/10.1086/185495 . [all data]

Coudert, 1993
Coudert, L.H., Analysis of the Rotational Levels of SiC2, J. Mol. Spectrosc., 1993, 160, 1, 225, https://doi.org/10.1006/jmsp.1993.1170 . [all data]

Ross, Butenhoff, et al., 1994
Ross, S.C.; Butenhoff, T.J.; Rohlfing, E.A.; Rohlfing, C.M., SiC2: A molecular pinwheel, J. Chem. Phys., 1994, 100, 6, 4110, https://doi.org/10.1063/1.466348 . [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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