Carbon

• Formula: C₅
• Molecular weight: 60.0535
• IUPAC Standard InChI: InChI=1S/C5/c1-3-5-4-2 Copy

  
• IUPAC Standard InChIKey: UNLWJHHUOPHOHT-UHFFFAOYSA-N Copy
• CAS Registry Number: 12595-82-3
• 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
  • 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 (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/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:
LL - Sharon G. Lias and Joel F. Liebman
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

View reactions leading to C₅⁺ (ion structure unspecified)

Electron affinity determinations

Ionization energy determinations

References

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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]

Hock, Kim, et al., 2012
Hock, C.; Kim, J.B.; Weichman, M.L.; Yacovitch, T.I.; Neumark, D.M., Slow photoelectron velocity-map imaging spectroscopy of cold negative ions, J. Chem. Phys., 2012, 137, 24, 244201, https://doi.org/10.1063/1.4772406 . [all data]

Wang, Averkiev, et al., 2010
Wang, L.M.; Averkiev, B.B.; Ramilowski, J.A.; Huang, W.; Wang, L.S.; Boldyrev, A.I., Planar to Linear Structural Transition in Small Boron-Carbon Mixed Clusters: CxB5-x- (x=1-5), J. Am. Chem. Soc., 2010, 132, 40, 14104-14112, https://doi.org/10.1021/ja103846q . [all data]

Arnold, Bradforth, et al., 1991
Arnold, D.W.; Bradforth, S.E.; Kitsopoulos, T.N.; Neumark, D.M., Vibrationally Resolved Spectra of C2-C11 by Anion Photoelectron Spectroscopy, J. Chem. Phys., 1991, 95, 12, 8753, https://doi.org/10.1063/1.461211 . [all data]

Kitsopoulos, Chick, et al., 1991
Kitsopoulos, T.N.; Chick, C.J.; Zhao, Y.; Neumark, D.M., Threshold Photodetachment Spectroscopy of C-5(-), J. Chem. Phys., 1991, 95, 7, 5479, https://doi.org/10.1063/1.461664 . [all data]

Yang, Taylor, et al., 1989
Yang, S.; Taylor, K.J.; Craycraft, M.J.; Conceicao, J.; Pettiette, C.L.; Cherhnovsky, O.; Smalley, R.E., UPS of 2-30 Atom Carbon Clusters: Chains and Rings, Chem. Phys. Lett., 1989, 144, 5-6, 431, https://doi.org/10.1016/0009-2614(88)87291-9 . [all data]

Vager, Feldman, et al., 1991
Vager, Z.; Feldman, H.; Kella, D.; Malkin, E.; Miklazky, E.; Zajfman, J.; Naaman, R., The Structure of Small Carbon Clusters, Z. Phys. D, 1991, 19, 1-4, 413, https://doi.org/10.1007/BF01448341 . [all data]

Zhao, de Beer, et al., 1996
Zhao, Y.; de Beer, E.; Xu, C.; Taylor, T.; Neumark, D.M., Spectroscopy and Electron Detachment Dynamics of C4-, C6- and C8-, J. Chem. Phys., 1996, 105, 12, 4905, https://doi.org/10.1063/1.472341 . [all data]

Ramathan, Zimmerman, et al., 1993
Ramathan, R.; Zimmerman, J.A.; Eyler, J.R., Ionization potentials of small carbon clusters, J. Chem. Phys., 1993, 98, 7838. [all data]

Dibeler, Reese, et al., 1961
Dibeler, V.H.; Reese, R.M.; Franklin, J.L., Mass spectrometric study of cyanogen and cyanoacetylenes, J. Am. Chem. Soc., 1961, 83, 1813. [all data]

Drowart, Burns, et al., 1959
Drowart, J.; Burns, R.P.; DeMaria, G.; Inghram, M.G., Mass spectrometric study of carbon vapor, J. Chem. Phys., 1959, 31, 1131. [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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